Jeff Rowland Model 1
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Original Hits: Number 1's [Audio CD]By Various Artists - EMI Music Distribution (2009) - British Invasion, Contemporary Pop/Rock, Dance-Pop
EMI's Original Hits: Number 1's is a better-than-average six-disc set highlighting 120 pop singles released on the label between the '60s and the '90s. Along with the original versions of tried-and-true radio classics by everyone from Blondie to Gerry & the Pacemakers are a few less-than-obvious inclusions by Chesney Hawkes, Mud, Peter Sarstedt, and Whigfield. ~ Al Campbell, Rovi [ Report abuse or wrong photo | Share your Jeff Rowland Model 1 photo ]
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(English)Jeff Rowland Model 1, size: 85 KB |
Related manuals Jeff Rowland Model 112 Jeff Rowland Model 12 Jeff Rowland Model 10 |
Jeff Rowland Model 1
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6:39pm on Saturday, October 30th, 2010  |
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Documents
MODEL 1 STEREO AMPLIFIER
OWNERS MANUAL
TABLE OF CONTENTS
Introduction Features Unpacking Instructions Installation * Space requirements * A.C. connections Input Impedance Selection Adjustable Gain Signal Connections * * * Single-ended input configuration, stereo operation Differential mode input configuration, stereo operation
Single ended input configuration, bridged-mono operation * Differential mode input configuration, bridged-mono operation Basic Troubleshooting Technical Specifications
Introduction Congratulations on your purchase of the Jeff Rowland Design Group Model 1 stereo amplifier. Please take a few moments to read this owners manual. Contrary to popular belief, there is actually quite a bit of useful information in an owners manual. The Model 1 offers tremendous interconnection flexibility regardless of the preamp used. A thorough understanding of your amplifier now can save you a lot of anxiety later. Features Lack of overall or nested negative feedback eliminates time domain distortion. Proprietary distortion canceling techniques minimize amplitude related distortions.
Each transistor individually tested and matched for optimum operating characteristics. Constant output impedance is maintained over the entire audio range, allowing for universal compatibility with associated equipment. The large number of high-speed bipolar output transistors provides uncompromising reliability and eliminates the need for electronic protection circuitry. A single voltage amplification stage utilizes field effect transistors (operating in transconductance mode), which increases low-level signal recognition. The absence of capacitors, inductors, fuses and protection circuitry throughout the signal path eliminates the adverse effects of these devices. A specially designed toroidal power transformer is supported by the substantial output stage capability. All critical circuitry is encapsulated in a thermally-conductive epoxy to ensure excellent thermal stability, mechanical integrity and to facilitate ease of service. Unpacking Instructions In the shipping crate you will find: --AC Power Cord --Various Fuses --XLR Shorting Plugs --Performance Certificate --Warranty Card (This form must be completed and returned to JEFF ROWLAND DESIGN GROUP [or its authorized distributor if outside the U.S.A.] within 14
days of purchase. Not only will your amplifier be registered, but you will, in the future, be informed of new products and services. We strongly suggest that you save all packing materials The amp can be lifted out of its crate while still wrapped in the plastic bag and surrounded by the protective foam.
Installation Locate the amplifier as close as possible to its final installation point. Allow access to the back panel for making connections. All Jeff Rowland Design Group products are convection cooled, eliminating the need for a fan. When operating, the amp should have at least 2 inches of space on all sides. It is acceptable to stack the amplifiers only if fresh air is allowed to circulate around them. When the amp is in position, the power cord should be inserted first at the inlet on the amplifier back panel, then connected to an appropriate power source. The amplifier is equipped with a "stand-by" power switch, located and identified on the rear panel, as well as an illuminated power push button switch on the front panel. The stand-by power switch should be turned on initially after plugging in the AC power cord. The amplifier will now be in stand-by mode, indicated by a dimly lit front panel button. The rear panel switch should be left on at all times, maintaining stable operating parameters and thereby improving performance, reliability and longevity. Power consumption in stand-by mode is less than 25 watts, providing low-cost operation. Pressing the dimly lit push button will switch the amplifier on for normal operation. Note that the lamp intensity will increase and a faint "click" will be heard. All subsequent onoff cycles should be initiated by the front panel switch. If the front panel switch does not light, the amplifier does not power up or a fuse blows, disconnect AC power, refer to the troubleshooting section of this manual or contact your dealer. Input Impedance Selection Your amplifier is provided with user-adjustable input impedance. A four (4) position D.I.P. switch for each channel is located and clearly marked on the back panel. Jeff Rowland Design Group has chosen 3 values of input impedance to cover the majority of applications. If you want to change your input impedance, please turn off the front panel power before doing so. Selecting from the switch codes shown below will provide the specific input impedance desired by the user.
The "low" setting is for use with most direct-coupled solid-state preamplifiers such as those made by Jeff Rowland Design Group; the "medium" setting is for use with most solid-state, hybrid and some tube preamplifiers; the "high" setting is for use with most tube preamplifiers. We have provided these different settings so that you may find which one provides the best sonic results in your system. Your amp comes set from the factory at the "medium" (20 k ohms) adjustment. Adjustable Gain The overall gain structure of your Model 1 amplifier can be adjusted to one of four different values, 20, 26, 29.5 or 32 dB. (Your amp comes set from the factory at the 26 dB adjustment.) The Model 5 can thus be used with dissimilar-gain preamplifiers, as well as with a wide variety of analog and digital sources (since many digital sources [compact disc players, digital to analog converters] have high output voltages relative to tuners, tape decks, etc.). This feature allows the volume control of your preamp to be used in its optimum position. It also permits you to tailor the gain structure for use with high or low-efficiency speakers. The gain switches are located on the underside of the plug-in modules and should only be adjusted by your Jeff Rowland Design Group dealer. Incorrect installation of these modules will result in damage to the amplifier circuitry which cannot be covered under warranty. Signal Connections The amplifiers from JEFF ROWLAND DESIGN GROUP offer unprecedented compatibility with associated equipment. In all cases turn the front panel power off before connecting or disconnecting signal wires. "Hot patching" is not recommended. A series of descriptions follows to explain the hookup schemes most commonly utilized in home stereo applications. For a more thorough understanding of the terms used in this section, please read the enclosed paper on differential mode technology. The back panel of the amplifier is clearly marked with the following: paralleled right and left channel outputs remote power switch connector right and left channel inputs (single-ended non-inverting, single-ended inverting and differential inputs) right and left channel input impedance adjust
AC power switch AC power connector AC line fuse Stereo operation with a single-ended output preamplifier For standard operation, insert the interconnect cables from your preamp to the noninverting RCA inputs. Insert shorting plugs into each of the inverting RCA inputs. If you desire inverted operation, reverse the above procedure. Either of the two paralleled outputs can be used, or all four if you are bi-wiring your speakers. Stereo operation with a balanced output preamplifier Insert the output of your preamplifier into either the differential XLR input or both the single-ended inverting and non-inverting RCA inputs. You can then utilize either of the two paralleled outputs, or all four if you are bi-wiring your speakers. Bridged-mono operation with a single-ended output preamplifier The following is the procedure for each amplifier: Insert the interconnect from your preamp into the right channel non-inverting input. There is a small switch, labeled "BRIDGE," located between the right channel XLR input and the AC standby switch; flip this switch up, into the "ON" position. Insert one of the XLR shorting plugs into the right channel XLR input. Connect the "hot" conductor of your speaker cable to one of the right channel outputs; connect the "ground" conductor of the cable to one of the left channel outputs. Bridged-mono operation with a balanced output preamplifier The following is the procedure for each amplifier: Insert the output of your preamplifier into the right channel differential XLR input. There is a small switch, labeled "BRIDGE," located between the right channel XLR input and the AC standby switch; flip this switch up, into the "ON" position. Connect the "hot" conductor of your speaker cable to one of the right channel outputs; connect the "ground" conductor of the cable to one of the left channel outputs. (NOTE: Do not use the XLR shorting plugs with this application.) Basic Troubleshooting If your amplifier does not turn on: 1. Make sure the power cord is connected to both the inlet at the back of the amp and an appropriate AC power source. 2. Check the power supply fuses located next to the AC inlet; there are two fuses-one is a spare.
If your amplifier shuts down after being turned on, with or without the presence of signal:
1. Check the rail fuses; on the Model 1, these are located on the inside of the amp adjacent to the encapsulated transformer. A fuse can often look good even if it is actually bad. If possible, check the fuses with a meter. 2. If the fuses are good, disconnect the inputs from the amp and see if it will power up again. Your amplifier will generally only shut down if it senses DC, thus protecting your speakers. Certain associated equipment can occasionally pass DC. If the above suggestions do not work or you are having other problems, please contact your Jeff Rowland Design Group dealer. Technical Specifications
Model 1
Output power Power Bandwidth Slew Rate THD and Noise Damping Factor Output Current Overall Gain Sensitivity Input Impedance Common Mode Rejection Ratio 60 watts RMS continuous, 8 ohms 120 watts RMS continuous, 4 ohms 215 watts RMS continuous, 2 ohms 0.3 Hz to 300 kHz, -3 dB 70 volts per microsecond Less than.025%, 1 kHz, 8 ohms, 20 watts Less than.035%, 1 kHz, 8 ohms, 60 watts Greater than 200, 20 Hz to 20 kHz, 8 ohms Greater than kHz, 8 ohms 22 amps peak, continuous 55 amps peak, 0.1 ohm, 20 msec, 1 kHz Selectable: 20, 26, 29.5, 32 dB 136 mV, 1 watt, 8 ohms Selectable: 100k, 20k, 600 ohms Greater than 90 dB
MODEL 5 STEREO AMPLIFIER
OWNERS MANUAL
TABLE OF CONTENTS
Introduction Features Unpacking Instructions Installation * * Space requirements A.C. connections
Input Impedance Selection Adjustable Gain Signal Connections * * * * Single-ended input configuration, stereo operation Differential mode input configuration, stereo operation Single ended input configuration, bridged-mono operation Differential mode input configuration, bridged-mono operation
Basic Troubleshooting Technical Specifications
Introduction Congratulations on your purchase of the Jeff Rowland Design Group Model 5 stereo amplifier. Please take a few moments to read this owners manual. Contrary to popular belief, there is actually quite a bit of useful information in an owners manual. The Model 5 offers tremendous interconnection flexibility regardless of the preamp used. A thorough understanding of your amplifier now can save you a lot of anxiety later. Features Lack of overall or nested negative feedback eliminates time domain distortion. Proprietary distortion canceling techniques minimize amplitude related distortions.
Each transistor individually tested and matched for optimum operating characteristics. Constant output impedance is maintained over the entire audio range, allowing for universal compatibility with associated equipment. The large number of high-speed bipolar output transistors provides uncompromising reliability and eliminates the need for electronic protection circuitry. A single voltage amplification stage utilizes field effect transistors (operating in transconductance mode), which increases low-level signal recognition. The absence of capacitors, inductors, fuses and protection circuitry throughout the signal path eliminates the adverse effects of these devices. A specially designed toroidal power transformer is supported by the substantial output stage capability. All critical circuitry is encapsulated in a thermally-conductive epoxy to ensure excellent thermal stability, mechanical integrity and to facilitate ease of service. Unpacking Instructions In the shipping crate you will find: --AC Power Cord --Various Fuses --XLR Shorting Plugs --Performance Certificate --Warranty Card (This form must be completed and returned to JEFF ROWLAND DESIGN GROUP [or its authorized distributor if outside the U.S.A.] within 14 days of purchase. Not only will your amplifier be registered, but you will, in the future, be informed of new products and services.
We strongly suggest that you save all packing materials Remove the foam pieces which protect the top of the amplifier. The amp can be lifted out of it's crate while still wrapped in the plastic bag. In the case of the Model 5 amplifier, do not attempt to move it alone! This amp is extremely heavy. Installation Locate the amplifier as close as possible to its final installation point. Allow access to the back panel for making connections. All Jeff Rowland Design Group products are convection cooled, eliminating the need for a fan. When operating, the amp should have at least 2 inches of space on all sides. It is acceptable to stack the amplifiers only if fresh air is allowed to circulate around them. When the amp is in position, the power cord should be inserted first at the inlet on the amplifier back panel, then connected to an appropriate power source. The amplifier is equipped with a "stand-by" power switch, located and identified on the rear panel, as well as an illuminated power push button switch on the front panel. The stand-by power switch should be turned on initially after plugging in the AC power cord. The amplifier will now be in stand-by mode, indicated by a dimly lit front panel button. The rear panel switch should be left on at all times, maintaining stable operating parameters and thereby improving performance, reliability and longevity. Power consumption in stand-by mode is less than 25 watts, providing low-cost operation. Pressing the dimly lit push button will switch the amplifier on for normal operation. Note that the lamp intensity will increase and a faint "click" will be heard. All subsequent onoff cycles should be initiated by the front panel switch. If the front panel switch does not light, the amplifier does not power up or a fuse blows, disconnect AC power, refer to the troubleshooting section of this manual or contact your dealer. Input Impedance Selection Your amplifier is provided with user-adjustable input impedance. A four (4) position D.I.P. switch for each channel is located and clearly marked on the back panel. Jeff Rowland Design Group has chosen 3 values of input impedance to cover the majority of applications. If you want to change your input impedance, please turn off the front panel power before doing so. Selecting from the switch codes shown below will provide the specific input impedance desired by the user.
The "low" setting is for use with most direct-coupled solid-state preamplifiers such as those made by Jeff Rowland Design Group; the "medium" setting is for use with most solid-state, hybrid and some tube preamplifiers; the "high" setting is for use with most tube preamplifiers. We have provided these different settings so that you may find which one provides the best sonic results in your system. Your amp comes set from the factory at the "medium" (20 k ohms) adjustment. Adjustable Gain The overall gain structure of your Model 5 amplifier can be adjusted to one of four different values, 20, 26, 29.5 or 32 dB. (Your amp comes set from the factory at the 26 dB adjustment.) The Model 5 can thus be used with dissimilar-gain preamplifiers, as well as with a wide variety of analog and digital sources (since many digital sources [compact disc players, digital to analog converters] have high output voltages relative to tuners, tape decks, etc.). This feature allows the volume control of your preamp to be used in its optimum position. It also permits you to tailor the gain structure for use with high or low-efficiency speakers. The gain switches are located on the underside of the plug-in modules and should only be adjusted by your Jeff Rowland Design Group dealer. Incorrect installation of these modules will result in damage to the amplifier circuitry which cannot be covered under warranty.
Signal Connections The amplifiers from JEFF ROWLAND DESIGN GROUP offer unprecedented compatibility with associated equipment. In all cases turn the front panel power off before connecting or disconnecting signal wires. "Hot patching" is not recommended. A series of descriptions follows to explain the hookup schemes most commonly utilized in home stereo applications. For a more thorough understanding of the terms used in this section, please read the enclosed paper on differential mode technology. The back panel of the amplifier is clearly marked with the following: paralleled right and left channel outputs remote power switch connector
right and left channel inputs (single-ended non-inverting, single-ended inverting and differential inputs) right and left channel input impedance adjust AC power switch AC power connector AC line fuse Stereo operation with a single-ended output preamplifier For standard operation, insert the interconnect cables from your preamp to the noninverting RCA inputs. Insert shorting plugs into each of the inverting RCA inputs. If you desire inverted operation, reverse the above procedure. Either of the two paralleled outputs can be used, or all four if you are bi-wiring your speakers. Stereo operation with a balanced output preamplifier Insert the output of your preamplifier into either the differential XLR input or both the single-ended inverting and non-inverting RCA inputs. You can then utilize either of the two paralleled outputs, or all four if you are bi-wiring your speakers. Bridged-mono operation with a single-ended output preamplifier The following is the procedure for each amplifier: Insert the interconnect from your preamp into the right channel non-inverting input. There is a small switch, labeled "BRIDGE," located between the right channel XLR input and the AC standby switch; flip this switch up, into the "ON" position. Insert one of the XLR shorting plugs into the right channel XLR input. Connect the "hot" conductor of your speaker cable to one of the right channel outputs; connect the "ground" conductor of the cable to one of the left channel outputs. Bridged-mono operation with a balanced output preamplifier The following is the procedure for each amplifier: Insert the output of your preamplifier into the right channel differential XLR input. There is a small switch, labeled "BRIDGE," located between the right channel XLR input and the AC standby switch; flip this switch up, into the "ON" position. Connect the "hot" conductor of your speaker cable to one of the right channel outputs; connect the "ground" conductor of the cable to one of the left channel outputs. (NOTE: Do not use the XLR shorting plugs with this application.) Basic Troubleshooting
If your amplifier does not turn on: 1. Make sure the power cord is connected to both the inlet at the back of the amp and an appropriate AC power source. 2. Check the power supply fuses located next to the AC inlet; there are two fuses-one is a spare.
If your amplifier shuts down after being turned on, with or without the presence of signal: 1. Check the rail fuses; on the Model 5, these are located on the inside of the amp adjacent to the encapsulated transformer. A fuse can often look good even if it is actually bad. If possible, check the fuses with a meter. 2. If the fuses are good, disconnect the inputs from the amp and see if it will power up again. Your amplifier will generally only shut down if it senses DC, thus protecting your speakers. Certain associated equipment can occasionally pass DC.
If the above suggestions do not work or you are having other problems, please contact your Jeff Rowland Design Group dealer.
Technical Specifications
Output power Power Bandwidth Slew Rate THD and Noise Damping Factor Output Current Overall Gain Sensitivity Input Impedance Common Mode Rejection Ratio Bridged Mono Output Power Power Requirements
150 watts RMS continuous, 8 ohms 300 watts RMS continuous, 4 ohms 475 watts RMS continuous, 2 ohms 0.15 Hz to 250 kHz, -3 dB 75 volts per microsecond Less than.03%, 1 kHz, 8 ohms, 20 watts Less than.075%, 1 kHz, 8 ohms, 60 watts Greater than 175, 20 Hz to 20 kHz, 8 ohms Greater than 60, 100 kHz, 8 ohms 40 amps peak, continuous 90 amps peak, 0.1 ohm, 20 msec, 1 kHz Selectable: 20, 26, 29.5, 32 dB 36 mV, 1 watt, 8 ohms Selectable: 100k, 20k, 600 ohms Greater than 90 dB 550 watts RMS continuous, 8 ohms 800 watts RMS continuous, 4 ohms 1000 watts RMS continuous, 2 ohms 100V-240V
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