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Ameritron AL-572


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Tuning the Ameritron AL572 Amplifier


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Comments to date: 4. Page 1 of 1. Average Rating:
pajowett 5:36pm on Sunday, October 17th, 2010 
Next time, I will spend the extra money and get a hard drive I can count on. Easy to use.
pax_vobiscum 2:24pm on Tuesday, September 21st, 2010 
Good, easy, reliable...until it suddenly FAILED Bought the drive in 2006, and everything was easy. Great hard drive Real specs of it 160GB hard drive: when formated comes out to 153GB as hard drives are rated in 1000MB= 1GB but all computers go ...
woodm 10:40am on Sunday, May 9th, 2010 
DONT BUY THIS PRODUCT i bought this a few months ago, pretty expensive but i thought it would be nice cuz of all its features. it stopped working. Excellent I just received the hard drive. It is completely silent, sleek looking, and mounts consistently on my iMac G5.
eichentamu 12:08am on Saturday, April 3rd, 2010 
Today I have received purchased eSATA cable and discovered that unlike my Kanguru eSATA/USB SSD flash stick this enclosure will only work if included ... My biggest disappointment was absence of the eSATA cable with this enclosure.

Comments posted on are solely the views and opinions of the people posting them and do not necessarily reflect the views or opinions of us.




The tubes must be installed in their sockets prior to operation. Observe the pin configuration on each tube and socket. Two of the of the four base pins are slightly larger in diameter. Carefully observe the pin alignment to be sure correct tube pins are centered on the socket's holes. Firmly press the tubes into the socket. Do NOT twist or force the tubes into their socket. Install the anode connector on the tube's anode terminal. Install the fuses and fuse caps on the back of the amplifier. This amplifier uses two 20A fuses for standard 120 Vac operation (models B and BY) or two 12A fuses for 240 V operation (model BX only). If you wish to operate the amplifier on a line voltage other than 120 volts, the jumpers on the power transformer primary windings must be changed. If the primary wiring is changed, the correct fuses must be installed. See the "TRANSFORMER CONNECTIONS" section on page 15 for more information. CAUTION: Always use fast-blow fuses rated at 250 volts or higher. NEVER use standard automotive glass fuses or slow-blow fuses. The top cover should now be installed with the ventilation holes on side of the cover positioned near the electrolytics. The ventilation holes on the top of the cover should be on the right side of the amplifier (front view). Secure the cover by installing the corner screws first. Install all the screws loosely until every screw is in place. Tighten the screws after they have all been installed. Note: Ameritron will NOT be responsible for shipping damage due to improper packing. The packing materials used to ship this amplifier are specially designed to prevent damage. All packing materials should be retained for future shipping. Replacement packing materials may be purchased from Ameritron if original packing materials are unavailable.


+ The AL-572 uses rugged inexpensive 572B tubes. + The 572B requires only a few seconds of warm-up time. + A dynamic bias circuit eliminates hundreds of watts of unnecessary heat generation in the power amplifier tubes. The result is cooler operation and longer component life. + A multi-voltage heavy-duty transformer with a unique "buck-boost" winding allows adjustment of the primary voltage to 14 different voltages centered on 115 and 230 volts. This versatile Ameritron feature allows the user to select the optimum primary voltage for maximum performance and life. + The tuning and loading controls have vernier 6:1 reduction drives for smooth tuning. Logging scales allow quick and repeatable control adjustments for rapid band changes. + The AL-572 has two illuminated cross-needle panel meters. The left meter provides a continuous reading of grid and plate currents. The right meter reads peak RF power output on one scale and Plate Voltage (HV), Reflected power and SWR (REF), ALC detector voltage (ALC), and ALC adjustment level (ALC SET) on the other scale. + Filament and plate voltages are maintained using the "STBY/OPR" switch. This allows the amplifier to be conveniently bypassed for "barefoot" operation. + A front panel "ALC SET" control allows convenient adjustment of the ALC threshold. The unique ALC circuit samples the grid current and power supply voltage. + An "XMT" LED on the front panel indicates proper keying of the amplifier by the exciter. + A rear panel "12 V" auxiliary output jack provides up to 200 mA at 12 Vdc for accessories such as the ATR-15 Antenna Tuner. + A step-start circuit limits the inrush current to the power supply and tube filament. This circuit extends the life of the amplifier components.

Circuit type:... Pi-network, slug tuned coils Maximum VSWR at resonance:.. 1.3:1 or less Minimum 2:1 VSWR bandwidth:.. typically 15% of center frequency Maximum SSB drive power permissible:.. 110 watts PEP Typical drive for full CW power output:. 75 watts


Circuit type:... Pi-L, Pi-network Typical SSB PEP voice operation:.. 1300 watts nominal CW continuous operation:... 1000 watts nominal 1/2 hour PEP two-tone test:.. 1000 watts 1/2 hour continuous carrier (RTTY):. not rated, contact factory for specification Frequency Coverage:.. 1.8 to 21 MHz amateur bands. (Export models include 24.5 and 28 MHz at reduced power. WARC bands available at reduced power) Third Order IMD:.. -34 dB or better (below PEP at rated output)


CW... approximately 61% SSB... approximately 65% (envelope crest)


Circuit type:... Full wave voltage doubler No load voltage:... 2900 V Full load voltage:.. 2500 V Full load current:..7 A NL to FL Regulation:.. 14% or less internal voltage drop Transformer:.. 21 lbs Capacitors:... 26 mFd total, computer grade
Normal line current at rated CW output:. 16 A at 120 Vac Normal line current at 1300 watt PEP output:.. 8 A average at 120 Vac Power line current in standby:.. 2 A at 120 Vac
Type:... (4x) 572B Continuous dissipation:.. 640 watts Warm-up time:... 3 seconds


Multimeter:... Peak forward power (continuously). The second scale switches between peak reflected power (and SWR), ALC threshold, ALC output voltage, and high voltage. Current meter:... Plate and grid current (simultaneously) on separate scales.
Negative going, 0 to 10 volts, adjustable.
Requires contact closure or sink of +12 Vdc at 100 mA. Back pulse protected.


RF:.... SO-239 Line:... NEMA 5-15P, standard 120 V three wire Others:... RCA Phono


Dimensions:... 15-1/2" D x 14-1/2" W x 8-1/2" H Weight:... 40 lbs.


An interlock switch is closed while the amplifier's top cover is in place. This switch completes the primary circuit of the power transformer. The interlock will open and de-energize the transformer primary if the top cover is removed. DANGER: High voltage can kill! Accidental contact with the voltages in this amplifier can be lethal.

For your personal safety please observe the following precautions: 1. NEVER defeat the interlock. 2. NEVER remove the cover with the amplifier connected to the power line. 3. ALWAYS allow the capacitors to discharge for several minutes after unplugging the amplifier and before removing the cover. 4. ALWAYS select the high-voltage (HV) function of the Multimeter to check the high voltage potential. Do not remove the cover if voltage is indicated. 5. ALWAYS ground the tube anode (top metal connector) to the chassis through a low value, high wattage resistor before touching anything inside the amplifier. 6. ALWAYS be cautious of heat. Many components inside the amplifier operate at high enough temperatures to cause burns. 7. NEVER make any unauthorized component or circuit modifications to this product. The only acceptable source for modifications is Ameritron or a source approved by Ameritron. Unauthorized modifications almost certainly will increase the risk of equipment failure or personal injury.
Peak envelope power (PEP) is often misunderstood by amateurs. PEP is not associated with the sine wave or root-mean-square (RMS) power, and PEP has no fixed ratio to average power on any mode except FM, FSK or CW. It is impossible to use a formula or "rule of thumb" approximation to convert between average and peak voice waveform powers. PEP is the power at the crest (highest point) of the RF envelope waveform. On SSB, the average power can vary from a few percent to more than half the PEP produced. Generally, PEP on SSB is two to five times greater than the average power. A 50 watt average power SSB signal could produce PEP levels from below 100 watts to more than 250 watts. On CW and other constant amplitude modes (such as FM or RTTY), the PEP is always equal to the average power. For example, on CW, FM, or RTTY 1000 watts of average power produces exactly 1000 watts of PEP.


The AL-572 is one of the few amplifiers using a "true" automatic level control (ALC) circuit. In this amplifier, the ALC actually samples grid current and power supply loading to determine the ALC voltage. The front panel "ALC SET" knob adjusts the level of grid current where ALC action begins. ALC action begins softly over a range of a few milliamperes to minimize distortion. This soft-touch ALC is an Ameritron exclusive. The ALC circuit is located on the METER BOARD P/N 50-0080-3 (behind the "MULTIMETER" switch). IC301 (pins 9 and 10) compares the voltage drop (caused by grid current) across R106 in the main power supply board. ALC voltage is derived by comparing the grid shunt voltage to the voltage from the power supply. The pin 8 output of IC1 will go negative if the grid shunt voltage exceeds the voltage from divider R311 and R2 (chassis mounted control), or if the supply voltage sags from excessive line voltage drop. Pin 8 is followed by current buffer Q303 that sources the negative ALC voltage to the ALC output jack. This amplifier includes an ALC Limit control on the rear panel. This control reduces overshoot and eliminates motorboating (a slow rhythmic fluctuation) in the transmitted signal. These problems are caused by excessive transceiver ALC attack time delay. This control sets the maximum voltage level available from the ALC circuit. Adjustment details begin on page 17.


The plate and grid current meter is located on the far left side of the front panel. This meter indicates the plate current (Ip) on the right-hand meter scale. This scale has a small picket every 25 mA, a large picket every 100 mA, and indicates 1000 mA at full deflection. 9
The left-hand meter scale indicates the grid current (Ig). The small pickets on this "Ig" scale appear every 10 mA and the larger pickets appear every 50 mA. The full scale "Ig" reading is 250 mA. The plate and grid meters in this amplifier normally indicate maximum grid current and maximum RF output at or near the same "PLATE" tuning setting. Maximum grid current and minimum plate current also generally occur at the same "PLATE" tuning setting. Note: If the grid and plate meters always track (move together in exact step) as the tuning controls are adjusted and if they show the same approximate amount of pointer movement, diode D117 on the power supply board could be shorted. D117 protects the grid current overload circuit (if used) and the meters. This diode is located near the electrolytic capacitors on outside edge of the main circuit board. D117 will usually short if there is a large high-voltage-to-chassis current fault. The grid and plate current meters will not read correctly if this diode fails. If D117 is shorted the overload circuit (if used) may repeatedly trip and grid current may appear excessively high before full power is reached.


The multimeter is the meter on the right. It continuously reads the forward peak envelope power on its left-hand scale (FWD). This scale is calibrated in 100 watt steps up to 2 kW. The right-hand scale of this meter provides four metering functions that are selected by the "MULTIMETER" switch. These functions include the measurement of high voltage (HV), reflected power and SWR (REF), ALC voltage output (ALC), and relative ALC threshold (ALC SET). The "Multimeter Functions" section that follows describes these functions in more detail. Multimeter Functions HV The multimeter indicates the dc plate voltage applied to the PA tube when the MULTIMETER switch is placed in the HV position. The correct scale to use is the ALC/ HV scale. This scale has a picket every 100 volts. Two zeros must be mentally added behind the numbers indicated on the meter scale (i.e. multiply by 100), so that "25"=2500 volts and "20"=2000 volts. Do not operate the amplifier if the high voltage is over 3000 volts with the amplifier on standby. See the "TRANSFORMER CONNECTIONS" section on page 15 for information on correcting excessive high voltage. REF The multimeter measures the antenna (or load) peak envelope reflected power and the SWR when the MULTIMETER switch is placed in the REF position. The full scale reflected power reading is 500 watts. This scale is marked every 10 watts below 100 watts, and every 100 watts from 100 to 500 watts. Note: The SWR of the load is measured when the "MULTIMETER" is in the REF position by observing the different red SWR curves. The forward and reflected power meter pointers will cross each other on, or near, the correct SWR curve.

ALC The multimeter measures the output voltage of the ALC detector when in the ALC position. The full scale ALC reading is 35 volts and is read directly from the ALC/ HV scale. The meter should flick upwards occasionally during normal ALC action. ALC SET The multimeter measures the approximate grid current that will produce ALC activity when the meter switch is in the ALC SET position. One zero must be added to the reading on the ALC/ HV scale for this function. For example, ALC action will begin at approximately 150 mA of grid current (typically between 120 mA and 180 mA) when the "ALC SET" control is adjusted until the meter reads "15."


The 572B is a reasonably rugged tube. The likelihood of premature failure can be reduced by avoiding excessive tube element temperatures. Element temperature is a function of the duration and the amount of power dissipated. The elements in the 572B have very good immunity to short term overload failures. The anode in the 572B can tolerate large dissipation overloads for short periods of time due to the thermal mass of the anode. Anode color is a good indication of incorrect tube operation. The anode in the 572B is designed to operate at moderate temperatures. These temperatures normally do NOT produce anode color. The graphite anode is coated or mixed with a "getter" material that de-gasses the tube. This material is activated by normal operating anode temperatures. The likelihood of gas failure (tube arcing) is reduced by operating the 572B tubes on a regular basis at normal ratings. Care must be taken to avoid exceeding the temperature ratings of the tube's glass-to-metal seals. The life of the tubes in this amplifier may be prolonged if tuning periods are kept short and a brief "cool-down" periods are provided between tuning periods. Try to allow a one or two minute non-transmitting "cool-down" period after lengthy CW or RTTY transmissions before shutting off the AC power switch. Incorrect operation is most likely to damage the tube's control grid or anode. Applying full drive power for several seconds with excessively "light" loading (indicated by abnormally high grid current) can cause control grid damage. Several seconds of high drive power operation with improper tuning or excessively "heavy" loading (indicated by low output power in concert with normal plate current) can melt or damage the anode. These undesirable operating conditions can be avoided by following the tuning procedures in this manual. In the AL-572, a grid current of 200 mA (at 100 watts of drive) produces rated grid dissipation. For maximum tube life, the short-term average grid current and drive power should always be kept below these values.

NEVER drive this amplifier with more than 100 watts of short term average envelope power. NEVER allow the grid current to exceed 200 mA under any operating condition.
Maximum power output normally will occur with approximately 125 mA of grid current on CW, or less than 45 mA of grid current (125 mA instantaneous peak) on SSB (two-tone test). Grid dissipation, with 125 mA of grid current and 70 watts of drive, is approximately ten watts. If you wish to add control grid protection to the AL-572, always remember fuses and resistors are too slow and unpredictable to adequately protect tubes. While grid protection is generally not required with tubes like the 572B, Ameritron does offer an optional fast-acting electronic circuit that will rapidly disable the amplifier if excessive grid current occurs. This circuit also reduces or eliminates the chance of tank component damage from incorrect loading or load failure. The part number of this add on board is 50-0080-5. The continuous commercial plate current rating of each 572B is 275 mA. For maximum tube life, total plate current should be maintained below 1100 mA on CW and other "steady" carrier modes. Brief periods of plate current exceeding 1100 mA will not cause loss of emission or shorten the amateur service life of the tubes in this amplifier. The application of filament voltage causes thermal stresses from rapid and uneven temperature changes. Avoiding needless cycling of the filament can prevent premature failure or unnecessary stress in the tube's filament. An accumulation of gas (or stray debris) in the tube can cause the tube to arc between the anode and the other elements of the tube. The resulting "gas arc" will generally manifest itself as a loud "pop" when the amplifier is first turned on. A "gas arc" will often damage diode D117 on the negative rail of the filter capacitor bank and open the fuses in the amplifier. If this problem occurs frequently, the tube should be tested or replaced. The use of low quality tubes, tubes that have been stored for extended periods, or abused tubes increase likelihood of a "gas arc". Ameritron recommends using only current code date 572B tubes.



"MULTIMETER" Switch This four position switch selects either the plate voltage (HV) of 0-3500 volts, the reflected peak envelope power (REF) of 0-500 watts, the ALC detector output voltage (ALC) of 0-35 volts, or the approximate ALC grid current threshold (ALC SET) of 0-350 mA. See the "Metering Functions" section on page 9 for more details. "OFF-ON" Switch This switch turns the main power off and on. When this switch is placed in the "ON" position the fan should start, the meters should be illuminated, and high voltage should appear. "STBY-OPR" Switch This switch disables the amplifier's internal antenna relay. In the "STBY" position the amplifier is bypassed without turning the tube's filaments or the power supply off.
This switch will also reset the grid protection circuit if an optional grid overload protection circuit is installed. The overload circuit will be reset whenever this switch is placed in the "STBY" position and returned to the "OPR" position. "PLATE" Control The "PLATE" control adjusts the output tank circuit to resonance. This control should always be adjusted for maximum RF output power. Maximum RF output power normally occurs simultaneously with maximum grid current and very close to the plate current "dip." "LOAD" Control This control adjusts the coupling of the amplifier to the antenna or load. This adjustment insures optimum coupling between the tube and the load as the SWR of the load, the operating frequency, or the power level is changed. Advancing the "LOAD" control clockwise increases the RF power output capability and the linearity of the amplifier. Advancing the "LOAD" control (clockwise rotation) also decreases the grid current and increases the plate current for a given amount of drive. The efficiency of the amplifier and the grid current decrease if the "LOAD" control is rotated beyond the point of maximum output. The linearity, however, will increase. The proper position for this control is slightly clockwise from the setting that produces maximum output with full drive power applied to the input. Never use the "LOAD" control to adjust the output power. Aways set power by reducing exciter power. The "PLATE" control should always be checked after the "LOAD" control is adjusted by more than one number. This is especially important at the high end of the "LOAD" range on 20 meters and above. For example, if the "LOAD" is advanced from 7-1/2 to 8-3/4, the "PLATE" should be re-tuned. If the "LOAD" is touched up only a slight amount, the "PLATE" setting will not usually require re-adjustment.


This amplifier is designed to operate at full ratings when it is driven by an exciter that has approximately 70 watts of RF output. An exciter with a lower output power may be used with a resulting decrease in amplifier output. Both the driving power and the "LOAD" control must be carefully adjusted when using an exciter that delivers more than 70 watts. Proper control settings will help prevent excessive grid current and spurious signals, which create needless interference to other operators. A monitor scope is recommended for continuous output observation. An oscilloscope is the best way of determining if the amplifier is "flat-topping" and producing excessive distortion products. A second method of determining linear operation is to monitor the peak RF output power carefully on the AL-572's internal meter. Determine the maximum obtainable RF output power and reduce the exciter's power until there is a noticeable margin from the maximum output power. This will insure some reserve power is available for random voice peaks. Note: Never increase the drive power beyond the point where the amplifier's output power stops increasing. This is also the point where the grid current will begin rising rapidly. The amplifier is being over-driven for a given "LOAD" setting when the grid current increases rapidly while the plate current and output power increase slowly. The amplifier "LOAD" control needs to be advanced to a higher number if this condition occurs. Non-linear operation, splatter, and excessive grid current will occur if the "LOAD" setting is too low. Excessive plate current is the proper indicator that the drive power limit has been reached.


These guidelines will help prolong tube and component life, and minimize splatter. 1. On SSB or other linear modes virtually any amount of power will cause splatter if the loading is too light ("LOAD" control too far counter-clockwise). Always tune for maximum output with maximum drive power. Reduce the drive power to reduce the output power on SSB, not the loading control. 2. Lightly loading an amplifier will also result in large voltages building up in the tank circuit. Under-loading an amplifier is much harder on the tubes and other components than operating a properly loaded amplifier into a high SWR or with excessive drive power. We recommend slightly overcoupling the amplifier (loading control advanced slightly beyond the point of maximum output) to insure the best linearity and freedom from arcing. 3. Never depend on average reading power or current meters to indicate proper operation on SSB or other linear modes. The best indicator of linearity is either an oscilloscope or the internal PEP RF output meter. Maximum linearity can be determined by finding the maximum output power possible and then reducing the exciter power for a slight reduction in output power. 4. Never exceed 170 mA of grid current on CW carrier during actual operation. The proper grid current for SSB will range from 0 to 75 mA. The SSB grid current will vary with the operator's voice, the amount of signal compression or processing, and the tube characteristics.


WARNING: The transformer must be wired correctly for your line voltage. This amplifier is normally shipped wired for standard 120 Vac operation. See the "TRANSFORMER CONNECTIONS" section on page 15 for details.
Important Note: If you have installed the optional electronic grid protection circuit to prevent control-grid damage, this amplifier will quit operating if the grid current exceeds a safe pre-set limit. The overload circuit responds much faster than the grid current meter. The overload circuit will respond to excessive grid current before the operator can observe the increase on the grid current meter. The grid overload circuit can be reset by momentarily placing the "STBY-OPR" switch in the "STBY" position. Many exciters generate high-level RF pulses when first keyed. These short duration pulses may greatly exceed the exciter's operating output power setting. Unexplained activation of the grid overload circuit may indicate the existence of this common exciter problem. Never under-load the amplifier to reduce the output power. The amplifier "LOAD" control must be set to a high enough position (clockwise) to prevent excessive voltage and arcing in the tank circuit or excessive grid current. Repeated tripping of the grid overload circuit or intermittent arcing probably indicates the "LOAD" control is adjusted too low. The goal of the following tuning procedure is to adjust the amplifier tuning and loading to provide maximum output at maximum exciter power. Avoid depending on the exciter's power control or ALC to maintain reduced power output, and peaking the amplifier at this reduced drive level. If the exciter suddenly puts out more power, the sudden surge of energy can cause splatter or cause the amplifier to arc. Overshoot is especially troublesome with radios capable of operating at more than 100 watts output power. For example, in several tests of popular 150 watt output radios, several radios adjusted to provide less than 100 watts output power during carrier conditions "spiked" above 200 watts before their ALC systems took control. The transcient output power pulse is fast, often lasting only a few milliseconds. The rapid speed of the pulse prevents normal peak reading meters or non-storage oscilloscopes from clearly indicating the problem. Overshoot problems are common, and we recommend slightly over-coupling the amplifier to the load. Overcoupling is accompished by advancing the LOAD control slightly beyond the point of maximum output power with full exciter drive (not to exceed 110 watts).

*11b. Increase the exciter drive power (if the ALC is not connected) until 180 mA of grid current is indicated. Adjust the "LOAD" and "PLATE" controls for maximum RF output power. The grid current should not be allowed to go above 200 mA at this stage. The plate current should not be allowed to exceed 750 milliamperes except during brief periods (15 seconds or less). *12a. For CW operation, the output power should be reduced with the "ALC SET" control until the rated output power of 1000 watts is obtained. The exciter's power can be reduced until the multimeter shows a slight upward flicker with the "MULTIMETER" switch in the ALC position if the ALC is used. *12b. For SSB operation, the "ALC SET" should be adjusted to allow 120 mA of grid current (near the 12 volt marking). The exciter should be set to produce maximum output power (not to exceed 110 watts of peak power). Next the amplifier's "LOAD" and "PLATE" controls are adjusted for maximum power output on the internal peak reading RF wattmeter with either a two-tone generator or sustained "HEL-L-L-L-L-O" driving the exciter. The "ALC SET" control should then be reduced until the peak power output is just reduced slightly. Finally the exciter's audio gain or output power is adjusted until the multimeter "ALC" position indicates the desired ALC level. This setting should normally allow around 120 mA grid current on a steady carrier or "whistle". Note: If the ALC is not connected, the amplifier should be fully loaded with maximum drive (not to exceed 110 watts). The exciter's output should then be reduced (either with the microphone gain or power output control until the output power shows a very slight reduction. "ALC SET" control Proper adjustment of the front panel "ALC SET" control accomplishes the following: 1. The exciter's power is limited to a value that will produce a fixed amount of grid current in the amplifier. The front panel "ALC SET" control determines the maximum grid current that can be produced. 2. The "LOAD" control setting will determine the maximum plate current and output power for a given grid current. Never exceed 750 mA of long duty cycle (more than 15 seconds without a 15 second cool down period) plate current. Never exceed 200 mA of operating grid current. 3. For normal SSB operation, the exciter power should be reduced until the ALC voltage (measured in the ALC multimeter position) flicks upwards on occasional voice peaks. This will produce the best audio quality. The drive can be increased for DX or weak signal SSB operation until the ALC steadily registers voltage. Also see the "ALC METERING, CONTROLS, AND ADJUSTMENTS" section beginning on page 17, and the "MULTIMETER" section beginning on page 9.

The efficiency of this amplifier will approach 62% in the FM, RTTY and DIGITAL OPERATION modes. Since these modes do not require linear amplification of complex waveforms, the tuning can be re-adjusted for maximum power at the desired output power level. This will keep the efficiency as high as possible.


The antenna transfer relay in the AL-572 takes approximately 15 milliseconds to change states. This precludes using the standard internal relay for QSK CW operation. Commonly available vacuum relays are specified at 5 to 7 milliseconds of switching time. Even expensive vacuum relays are less than ideal for high speed QSK operation. At 60 WPM, less than 50% of the receive-time is available with vacuum relays. On PACKET, AMTOR, and other modes, delay can be added to the transmit and receive changeover to use either vacuum or our standard relay effectively. Ameritron offers two highspeed PIN diode options that permit operation on modes requiring high speed receive-transmit switching. Both systems offer noiseless switching times of under one millisecond. Since these PIN diode systems are several times faster than vacuum relay systems, they will allow over 90% of the available receive time to be used at 60 WPM. Ameritron highly recommends using the external QSK-5 switch. This stand alone PIN diode switch can be used with almost all types of amplifiers and transmitters. Modifications are not required in amplifiers used with the QSK-5 unit. The QSK-5 operates directly from 120 Vac power lines. Ameritron also offers an internal QSK board as a space-saver for the AL-572. This internal board is slightly less expensive. However, it provides less flexibility and serviceability than the external QSK-5 unit. Factory installation of the QSK-5PC is highly recommend. Contact Ameritron for details on the QSK-5 and the QSK-5PC.


The high voltage present on various parts of the amplifier will attract dust and dirt. The high voltage areas at the bottom of the plate choke and the plates and insulators of the air variable capacitors should be kept dust free. These areas should be inspected periodically, especially if the amplifier is operated in a dusty environment. These areas may be inspected by unplugging the line cord and waiting a few minutes for the power supply capacitors to discharge. The high voltage should then be checked with the internal multimeter by placing the meter switch in the HV position. DANGER: High voltages can kill! Accidental contact with the voltages in this amplifier can be lethal!
For your personal safety please observe the following precautions: 1. NEVER defeat the interlock. 2. NEVER remove the cover with the amplifier connected to the power line. 3. ALWAYS allow the capacitors to discharge for several minutes after unplugging the amplifier and before removing the cover. 4. ALWAYS select the high-voltage (HV) function of the Multimeter to check the high voltage potential. Do not remove the cover if voltage is indicated. 5. ALWAYS ground the tube anode (top metal conductor) to the chassis before touching anything inside the amplifier. 6. ALWAYS be cautious of heat. Many components inside the amplifier operate at high temperatures. 7. NEVER make any unauthorized component or circuit modifications to this product. The only acceptable source for modifications is Ameritron or a source approved by Ameritron. Unauthorized modifications almost certainly will increase the risk of equipment failure or personal injury. The cover should be removed and a low value (40 to 500 ohm) two-watt or larger resistor should be secured to the chassis. The other end of this resistor should be connected to the tube anode with an insulated clip lead. CAUTION: NEVER ground the anode directly to the chassis without a series resistor. Component damage may occur from the current surge. Note: This resistor is a safety device that must be installed when beginning service work and removed when the work is finished. Dust and dirt can be blown out of the amplifier with a shop vacuum or a high pressure air hose. A soft bristle brush dipped in alcohol can be used to clean particularly dirty areas. If the amplifier is operated in a dusty environment, a non-conductive low- restriction foam air filter can be placed over the ventilation holes on the left side of the cabinet near the filter capacitors. Placing an air filter over these air inlet holes will substantially reduce the amount of dust entering the cabinet. Most hardware stores stock suitable air filter material that are used as replacement filters for window air conditioners.


Designator D101,102,114,115 D103 D116-120 D104-113 C101 C102,105 C103 C104 C106,125,126,129,135-137 C140 C107-116 C117-124 C127 C128,138,132,139 C130,131 C133 C134 R101 R102 R103,104,121 R105 R106 R107 R108,109 R110,111 R112-119 R120 R122 R123 R124,125 R126,128,128 R127 R130 RLY101 RLY102 RFC101 T101 Q101 Q102 Q3 (see main chassis) F101 Description 1N34A 1N757A Zener 9.1V 1N4001 1NpF 500 V.001 uF 1 kV 10 pF 1 kV 3-12 pF 500 V Trim.01uF 50 V Disc.47 uF.01 uF 1 kV 210 uF 450 V Elect. 270 pF 500 V.1 uF 50 V.01 uF 250 Vac 2200 uF 25 V 220 uF 25 V 4.7k mox 1 W 470k 1/4 W 10k 1/4 W 10 ohm 1/2 W 1.5 ohm 2 W 1% 0.6 ohm 3 W 1% 1M 3 W 1% special high voltage type 750k 2 W mox 2% 50k 7 W 5% 51ohm 2 W mox 5% 6.8k 1/4 W 1.8k 1/4 W 50k trim pot 47k 1/2 W 10 ohm 10 W 47 ohm 1/2 watt 3PDT 12 Vdc SPST 12 Vdc Choke 3 turns FB-73 Toroid 2N3904 2N3906 MJF3055 transistor, NPN 2A Ameritron P/N 300-0346 305-0757 300-0266 300-0145 208-5404 200-2120 200-3531 204-0150 200-0416 203-0530 200-2121 203-0578 208-5775 200-0754 200-2122 203-0207 203-0565 103-1747 100-0188 100-4100 100-0727 103-3400 103-3399 103-2223 103-1743 103-7580 103-2151 103-1747 100-0728 104-0400 101-0402 103-9702 101-1470 408-6140 408-6148 10-15168 10-14134 305-0645 305-0722 305-3055 755-1102
Designator C201 (transmitter side) C202 (tube side) C213-215 RFC1 L201 S201 Description See input chart See input chart.kV disc capacitor filament choke 30 ampere See input chart Input switch Ameritron P/N


BAND 40 20/30 15/17 10/12 C217 C201,211 (pF) input 2700 (208-5689) 1300 (208-5177) L201 new new (405-1137) (405-1097) (405-1087) (405-1037) C 202,212(pF) tube 2700 (208-5689) 1000 (208-5176) 500 (208-5691) 220 (208-5175) 180 (208-5396)
23.75T 22.75T 13.75T 9.75T 8.75T 3.75T 68 pF

METER BOARD (50-0057-3)

Designator D301 C301, 302 C303, 304, 307-311, 314, 315 C305, 306 R301, 302 R303 R304 R305 R306, 310 R307 R308, 311 R309 R312 R313 IC301 Q301, 302 Q303 S301 Description 1N34A.47 uF 50 V tantalum.1 uF 50 V.001 uF 1 kV 2.2M 1/4 W 390 ohm 1/4 W 2.2k 1/4 W 470k 1/4 W 10k 1/4 W 100 ohm 1/4 W 33k 1/4 W 4.7k 1/4 W 330 ohm 1/4 W 270 ohm 1/4 W LM324 2N3904 2N3906 Rotary 2P6T Ameritron PN 300-0346 203-0530 200-0754 200-2120 100-6220 100-0390 100-1500 100-0188 100-4100 100-2100 100-3330 100-1470 100-0330 100-0600 311-0324 305-0645 305-0722 500-0563
Designator C501-506 C507,508 C509 D501, 502 D503 IC501 Q501 Q502 Q503, 504 R501-503 R504, 505 R506, 508 R507 R509 R510 R511 RLY501 FB Description.01 uF 50 V disc.47 uF tantalum 100 uF 25 V 1N4001 5.6 V zener LM 358 dual op-amp NPN transistor MJF3055 PNP transistor 2N3906 NPN transistor 2N3904 10k 1/2 W 3.3k 1/4 W 680 ohm 1/4 W 1.8k 1/4 W 1 meg 1/4 W 1k 1/4 W 180 ohm 1/2 W DPDT 12 V dip relay FB 73-801 Ferrite Bead Ameritron P/N 200-0416 203-0530 203-0564 300-0266 301-710 311-0724 305-3055 307-0722 305-0645 101-0643 100-0729 100-0532 100-0728 100-0730 100-0727 101-0384 408-2135 10-15168

Designation B1 C1-3 C4 C5, 6 C7 C8 C11-13 C14-19 D1 F1, 2 50-0080-1 50-0080-2 50-0080-3 50-0080-4 50-0080-5 L1 L2 L3 M1 M2 R1 R2 R3-4 PC1-4 RFC2 RFC3 S1 S2 S3 S4 R16 Q3 T1 V1-4 Description Fan.001 uF 7.5 kV 500 pF Doorknob 7.5 kV 170 pF Doorknob 7.5 kV Air Variable Plate 250 pF 3.5kV Air Variable Load 800 pF 1.2 kV.01 uF 50 volt dc disc capacitor.01 uF 1kV disc capacitor LED, Red See Jumper Connections Chart Power Supply / SWR Board Assembly Input Circuit Board Assembly Metering Board Assembly RF Tank Board Assembly (only parts L1-L2) Timer-Overload Board Assembly (optional.-See page 31) "L " Coil LF Coil (mounted on 50-0572-4) HF Coil (mounted on 50-0572-4) Meter (Forward and Reflected) Meter (grid and plate) 1 k pot (ALC limit) 100 k pot (ALC SET) 51 ohm 2 watt carbon composition Parasitic choke assembly Plate Choke 2.5 mH Choke Band Switch Lighted Switch Rocker Switch Interlock Switch 33 ohm 1/4 watt Transistor MJF-3055 Transformer 572B Tube Ameritron P/N 410-3138 200-7224 210-0470 209-0559 204-2112 204-2573-1 200-0416 200-2121 320-0522-1 -------------50-0572-1 50-0572-2 50-0572-3 50-0572-4 50-0572-5 10-13165 10-13240 10-13108 400-3581 400-3580 105-1301 105-1341 10-00572 10-15197 402-1162 500-2135 507-1157 507-1150 504-3247 100-1330 305-3055 406-0572-1 350-0572


HF Amplifiers

Gives 800 Watts PEP output!

Pactor Modems

PACTOR-II - Real multi port unit - Low power consumption - GPS interface for NMEA data - Now all upgraded to PactorIII
The AL-811HX amplifiers are used more than any others in the world. AL-811HX has a worldwide reputation for legendary quality, flawless performance, proven reliability and superb customer service. All band, all mode coverage 160-10 Meters, extra heavy duty power supply, tuned input circuit providing a 50 Ohm load for your rig, optimum Q output tank, quiet pressurized ventilation, two illuminated meters, exclusive Adapt-A-Volt power transformer.

PTC-IIex $965*

*Pactor III Upgrade INCLUDED!


Doubles Average SSB power, 1KW PEP SSB
Ameritrons AL-80BX KW output desktop HF linear can double your average SSB power output with high-level RF processing using Ameritrons exclusive Dynamic ALC. Features RF Bias heat eliminator, heavy duty power supply, genuine Amperex 3-500Z tubes, 70% efficiency over nearly the entire operating range.

PTC-II Pro $1400*

AL-572X Near Legal Limit Amplifier
Ameritron AL-572 has 1300 Watt PEP SSB and 1000 Watt CW output, 160-10 Meters, 4 rugged Svetlana 572B tubes. Near Legal Limit power and 3-seconds warm-up. Built in multi-voltage AC supply, dynamic ALC, tuned 50 Ohm input, QSK compatible, fan cooled vernier reduction drives on plate & load.

$1795 $860

PTC-II-usb $1200*
ALS-500MX 500 Watt Mobile Amplifier
Ameritron ALS-572MX no tune solid state amplifier has 500w output, 160-10 Meters. Requires 13.8 VDC and 75 amps. Small size 3.5 x 9 x 15" fits easily into most automobiles. Instant band switching, no tuning and no warm up required. Uses 4 rugged 2SC2879 high power linear RF transistors. SWR and ALC fault protection disables and bypasses the amplifier if antenna SWR is excessive.
The ultimate HF modem! Fast, full featured and upgradable to PACTOR-III. Send email, transfer files, establish real-time data links. The PTC-IIpro modem is the multi mode data interface between your PC and radio equipment. The PACTOR-II mode is the industry standard, and the most robust digital mode available for radio data connections. The PTC-IIpro will maintain links in conditions with signal to noise ratios of minus 18 dB, transferring data with absolutely inaudible signals. The PTCIIpro comes standard with 2 MB of RAM for incoming data storage, integrated RS-232 and TTL interface for control of common radios and a temperature compensated crystal oscillator for stability. The PTC-IIpro incorporates an audio amplifier for output to a speaker or headphones, which allows the PTCIIpros powerful DSP to be used with any audio signal. Built-in ability for GPS position reporting. With the optional Packet-Radio modules, the PTC-IIpro will function as a VHF/UHF modem (up to 19200 baud) and act as a bidirectional gateway for data between HF and VHF/UHF radios.

Antenna Rotors


Azimuth Elevation

G-800SA Med. Duty Rotor
- Light duty for small VHF/UHF/HF arays - Combination azimuth and elevation rotor - Will handle 17 sq. ft. - Azimuth handles 17 sq. ft. - Quick disconnect plug - Elevation Handles 10 sq. ft. - 440 lb vertical load - Az. mast size 1.5 - 2.5" - Takes mast up to 2.5 " - Elevation mast size 1.5 - 2.5" - G800DXA as above with presets $495 - Quiet gear reduction braking system

T-2X Heavy Duty Rotor

- Heavy duty design handles 20 sq. ft. - Alloy ring gear strength - Low temperature grease - North or South as center
- One of the most popular rotors in the world - Will handle up to 15 sq. ft. - Locking steel wedge braking system

Medium Duty Rotor HAM-IV

G-1000DXA Med. HD Rotor
- Medium to heavy duty for large HF arays - Will handle 23.5 sq. ft. - Quiet gear reduction brake - Mast size up to 2.5" - 440 lb vertical load - User selectable North or South center

G-2800DXA HD Rotor

- Heavy duty design handles 32 sq. ft. - 450 deg. turning radius - Quick disconnect plug - Takes up to 2.5" mast size - Selectable North or South as center - Variable rotation speed & preset

CD-45II Light Duty Rotor

- The CD-45II is good for small arays- Will handle 8.5 sq. ft. - Dual 48 ball bearing race - Takes mast up to 2 1/16

Compact Rotor AR-40

- The AR-40 is for compact beams - Will handle up to 3 sq. ft. - Auto position sensor - Dual 12 ball bearing race

Switches and Arrestors

Coax Switches Lightning Protectors
ATT3G50U - 200 w, SO-239 $65 ATT3G50UHP - 2000 w, SO-239 $65 ATT3G50 - 200 w, N Conn $70 ATT3G50HP - 2000 w, N Conn $75
LAC-4N Gas tube lightning arrestor, 200 watts, N connectors. 80

4 Position Delta-4

- Constant impedance cavity - Unused positions are grounded - Arc-Plug for protection DELTA-4N - $115 Same as above with N con DELTA-2 - $80 - 2 position switch w/arrestor


2 Position coax Switch
- High quality construction with Die-cast chassis - Brass and silver internal spring contacts - The unused position grounded when not selected - 0 to 650 MHz coverage with low insertion loss
RCS-Position Remote coax Switch
Handles DC to 30 MHz up to 1Kw output. Control voltage is carried by coax shield. Control cable not required.
RCS-8V 5 Position Remote coax Switch
Handles DC to 250 MHz up to 1Kw output, Useable to 450 MHz Requires control cable for antenna selection.
Handles DC to 100 MHz up to 5Kw output. Safe as it uses low voltage on control cable. 4 conductor control cable required.
MFJ-1700C MFJ-1701 MFJ-1704 MFJ-1704N
6 position Ant. switch for HF/ANT 6 position coax switch for HF 4 position coax switch for 0-450 MHz 4 position coax switch for 0-450 MHz with N connectors

100 100

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