3383 Gage Avenue, Huntington Park, CA, 90255 Phone: 323-277-4100 Fax: 323-277-4108 National: 1-800-344-4384 Internet: www.B-52GUITAR.com E-mail: info@B-52PRO.com 8
E.T.I. Sound Systems is dedicated to product excellence and therefore continuously attempts to improve each and every model we manufacture. This ongoing process includes refinements in design, materials and workmanship, which may result in products that differ than those described in our literature. All features, specifications, and prices are therefore subject to change without notice.

B-52 PROFESSIONAL

IMPORTANT SAFETY INSTRUCTIONS!
1) 2) 3) 4) 5) 6) 6) 7) 8) 9) Read these instructions. Follow all instructions. Keep these instructions. Heed all warnings. DO NOT turn on the AT-100 without the loudspeaker connected. Do not use the AT-100 near water. Be extra cautious when moving the AT-100 during rain or while transporting it over wet surfaces as water might splash onto the amplifier. Clean only with dry cloth. Do not block any ventilation openings and operate in accordance with manufacturers instructions. Do not install near heat sources such as radiators, stoves or other devices that may produce heat. Do not defeat the safety purpose of the polarization or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong is provided for your safety. If the provided plug does not fit your outlet, consult an electrician for replacement of the obsolete outlet. Protect the power cord from being walked on or pinched, particularly at the plug and the point where it exits the AT-100 amplifier. Only use attachments / accessories specified by B-52 Professional. Unplug the AT-100 during lightning storms and when not in use. Refer all servicing to qualified personnel. Servicing is required when the AT-100 has been damaged in any way such as when power-cord or plug is damaged, liquid has been spilled into the amplifier, the unit has been exposed to moisture or rain, does not operate normally, or has been dropped. To reduce the risk of fire or electric shock, do not expose the AT-100 to rain or moisture. Moisture can damage the AT-100 and can cause corrosion of electrical contacts. Keep the unit out of extended or intense direct sun light. No containers filled with any type of liquid should be placed on or near the AT-100. Never remove the front or rear panels of the AT-100 while it is connected to an electrical outlet.
Important Safety Instructions / Features...2 Important Information..3 AT-100 Controls..4-5 Set-up & Warranty Information..5-7 Contact Information..8
This B-52 Stealth Series AT-100 has a 100% pure, all-tube signal path, incredible tone and a wide array of guitarist friendly features. It combines Russian Sovtek 6L6 power tubes with 12AX7 preamp tubes for solid tube tone and classic breakup. This roadworthy head provides serious musicians with monstrous gain, extreme levels of distortion and a sparkling clean channel. Selectable solidstate or tube rectification through a Sovtek 5AR4 ensures complete tonal authenticity.

INSIDE THIS INSTRUCTION MANUAL

AT-100 FEATURES

10) 11) 12) 13)

q q q q q q

14) 15) 16)
1/4 High and Low Input Jacks Overdrive channel with Gain1, Gain2, assignable Contour, three band EQ and level controls Clean Channel with Level control, 3 band EQ and Bright switch Master section with Volume, Low-Resonance and Reverb controls Rugged footswitch for Channel Select, Gain Select, Reverb on/off and Effects Loop on/off Push switches for channel, gain select and Contour assign Effects send and return with level controls Line out with level control Two speaker output jacks - selector switch for 4, 8 or 16 ohms Ground lift switch Rectifier select switch for: Tube A, Tube AB1 and Solid-State 27 x 11 x 11 (W x H x D) Weight: 52 lbs. SOVTEK TUBE CHART x x x x Power Tubes: Preamp Tubes: Reverb Tube: Rectifier Tube: 6L6 12AX7 12AT7 5AR4
RISK OF ELECTRIC SHOCK DO NOT OPEN

CAUTION

HEED ALL WARNINGS!
WARNING: To reduce the risk or fire or electrical shock do not expose this equipment to rain or moisture.
Thank you for choosing the B-52 AT-100 amplifier. This guitar amplifier is perfect for guitarists of every level. Whether you are playing to a stadium crowd of 50,000 or practicing at home in your garage, the AT-100 will produce awesome crunch, smooth mids and crystal-clean highs. It is also capable of producing massive amounts of distortion, perfect for any style from blues to metal. This instruction manual explains all that the AT-100 has to offer, how to operate and control each feature so you can achieve the sound you desire. B-52 HIGHLY recommends that you read this detailed instruction manual carefully and heed all warnings.
AT-100 100-WATT ALL-TUBE LEAD GUITAR AMPLIFIER!
B-52 AT-Series Speaker Cabinets
(Recommended for use with AT-100)
AT-412A 480-Watt RMS speaker cabinet - Slant AT-412B 480-Watt RMS speaker cabinet - Straight
The B-52 AT-412A and AT-412B, 4x12 slant and straight cabinets are a perfect complement to the AT-100 all-tube amplifier. They offer awesome tone and incredible projection. With four custom-built, 120-watt 12 speakers, these cabinets provide crystal clear highs and heavy distortion with classic breakup. FEATURES: q 4 x 120-watt, custom built, heavy-duty speakers q Cloth-finished front q Rear porting for extended low-frequency response q Metal handles, rubber feet and metal corners q Detachable casters for easy transport q Authentic black vinyl finish q Baltic Birch Construction q Mono/Stereo Switchable

AT-412A

AT-412B
B-52 Stealth Series amplifiers and speakers, including the AT-100, are capable of producing sound pressure levels (SPL) sufficient to cause permanent hearing damage to performers, production crews or people in the audience. Hearing protection devices such ear-plugs are recommended. Caution should be taken to avoid extended SPL is excess of 90 dBA. Do not attempt to service the AT-100 by yourself. Refer all servicing to a B-52 Stealth Series Authorized dealer. Service is required when the AT-100 has had liquid spilled on or inside the unit, has been damaged in any way, has been exposed to rain or moisture, does not operate normally or has been dropped. To reduce the risk of fire or electrical shock, do not expose this unit to rain or moisture. Do not operate your AT-100 near a pool or other standing water. Make sure all blades on the polarized power plug are fully inserted into the power source. Ensure the power cord is not stretched, pinched or otherwise abused. Ensure the power cord is routed to avoid foot traffic. Your AT-100 amplifier should be cleaned only with a dry cloth.
HEARING DAMAGE, PROLONGED EXPOSURE TO EXCESSIVE SPL
AMPLIFIER MODULE PRECAUTIONS

WARNING SHOCK HAZARD:

AT-100 - FRONT PANEL FEATURES & DESCRIPTIONS
POWER ON/OFF SWITCH: Turns the AT-100 on and off. STANDBY ON/OFF SWITCH: Allows the AT-100 to remain turned ON for limited periods of inactivity without the risk of damaging / over-heating the amplifier tubes. When the Standby switch is in the STANDBY position the AT-100 is in a nonoperational setting. When in Standby the Sovtek tubes remain hot and ready for use. This bypasses the time required for the tubes to warm up before use. When the Standby switch is in the ON position the AT-100 is operational and should not be left inactive. DO NOT turn on the AT-100 or have the Standby switch set to ON without it connected to a loudspeaker. PILOT JEWEL. Power on indicator. MASTER REVERB CONTROL: Adjusts the amount of reverb produced by the amplifier. To increase the amount of reverb turn clockwise.
AT-100 - Rear Panel Features & Descriptions
To reduce the risk of fire or electrical shock, do not expose this unit to rain or moisture. Do not operate your AT-100 near a pool or other standing water. Make sure all blades on the polarized power plug are fully inserted into the power source. Ensure the powercord is not stretched, pinched or otherwise abused. Ensure the power cord is routed to avoid foot traffic. Your AT-100 amplifier should be cleaned only with a dry cloth.

WARNING: SHOCK HAZARD!

MASTER LOW RESONANCE: Controls the overall resonance of the amplifier. Turning the control clockwise adds rich low end. 6. MASTER VOLUME: Controls the overall signal level of the AT-100. To increase the overall signal and/or volume, rotate the control clockwise. The Master volume control allows you to preset the output levels of both the Clean and Overdrive Channels. 7. CLEAN CHANNEL VOLUME: Controls the overall signal level of the clean channel.Adjusting the volume control enables you to produce sparkling clean sounds to crunchy, dirty blues. Turned all the way to the left you will experience clean sounds. A setting all the way to the right will produce moderate levels of distortion. 8. CLEAN CHANNEL - BRIGHT: Adds high end sparkle. 9. CLEAN CHANNEL - TREBLE: Adjusts the amount of high frequency boost or cut as desired in the clean channel. Treble adds brightness to your tone. Turning this control clockwise will add brilliance to your sound. Turning the control counterclockwise softens the tone. 10. CLEAN CHANNEL - MIDDLE: Adjusts the amount of mid-range frequencies as desired in the clean channel. Turning the middle control clockwise will increase the amount of warmth in your tone. Counterclockwise settings create a more pristine, acoustic kind of sound.
26. EFFECTS - SEND JACK: Connects to the AT-100 to the input off an effects unit. 27. EFFECTS SEND LEVEL: Controls the sending level output to an effects unit. 28. EFFECTS RETURN LEVEL: Controls the input capacity of the returning signal from an effects unit. 29. EFFECTS RETURN JACK: Connects the AT-100 to the output of an effects unit. 30. FOOTSWITCH GAIN AND CHANNEL SWITCH: Switch

31. 32. 33. 34.

between Gain 1 and Gain 2 in the overdrive Channel. Also switches between clean and overdrive channel. FOOTSWITCH - EFFECTS/REVERB: Connects footswitch to turn the reverb on/off and the effects loop on/off. LINE OUT JACK: Connects the AT-100 to an external linelevel device such as a mixing board. LINE OUT LEVEL CONTROL: Controls the output capacity of the Line Out Level. IMPEDANCE SELECTOR SWITCH: Allows the AT-100 to safely
11. CLEAN CHANNEL - BASS: Adjusts the amount of low frequency boost or cut as desired. Adding bass will increase the depth and fullness of your sound. 12. CHANNEL SELECT: Push switch selects between the clean and overdrive channels. Activated LED lights indicate which channel is in use. 13. OVERDRIVE VOLUME 2: Controls the overall volume of the high gain overdrive channel. 14. OVERDRIVE VOLUME 1: Controls the overall volume of the medium gain overdrive channel. 15. OVERDRIVE CHANNEL GAIN SWITCH 2: Activates the CONTOUR control for Gain 2. 16. OVERDRIVE CHANNEL CONTOUR: Varies the critical midrange tone in the overdrive channels. Adjusts from classic midrange punch to scooped metal madness. 17. OVERDRIVE CHANNEL GAIN SWITCH 1: Activates the CONTOUR control for Gain 1. 18. OVERDRIVE CHANNEL TREBLE: Adjusts the amount of high frequency boost or cut as desired in the overdrive channel. Turning this control clockwise adds clarity to your sound. 19. OVERDRIVE CHANNEL MIDDLE: Adjusts the amount of mid-range frequencies as desired in the overdrive channel. Similar to the Clean Channel function, the O.D. Channel Middle

control adds body and punch to your sound. 20. OVERDRIVE CHANNEL BASS: Adjusts the amount of low frequency boost or cut as desired in the overdrive channel. Bass is B-52s signature. Turning this control clockwise increases depth and low-end punch to your music. 21. OVERDRIVE CHANNEL GAIN 2: Adjusts the amount of distortion in Gain 1. (Activated LED indicates in use). 22. OVERDRIVE CHANNEL GAIN SWITCH: Push switch Selects between Gain 1 and Gain 2 controls. Activated LED lights indicate which channel is currently use. 23 OVERDRIVE CHANNEL GAIN 1: Adjusts the amount of distortion in Gain 1. (Activated LED indicates in use). 24. INPUT CONNECTOR - LOW: Connects your guitar to the AT-100. B-52 recommends that you use a cable that is screened or shielded. 24. INPUT CONNECTOR - HIGH: Plug your guitar into either one. Use the one that sounds best to you. Always use a high quality, shielded instrument cable.
operate into any 4 ohm, 8 ohm or 16 ohm cabinets(s). NOTE: Always set the switch to match the impedance of your cabinet(s). 35. LOUDSPEAKER OUTPUTS: Connects the AT-100 to the speaker cabinets such as the AT-412A or AT-412B.
36. GROUND / LIFT SWITCH: Removes ground from the circuit to eliminate 60-cycle hum.
NOTE: Always be sure the speakers are plugged in before attempting to operate the amplifier. Always use a high quality, heavy duty, unshielded speaker cable. Severe damage can occur from failing to connect the speakers and properly setting the impedance selector switch.
37. 3-SETTING RECTIFIER SWITCH: SOLID-STATE Gives tightest low-end definition and fastest attack. TUBE AB1 Punchy, warm and tighter definition than Tube A. TUBE A Vintage attack and feel. Warmest sounding setting. 38. POWER TUBE FUSE: Power tubes failure fuse 39. AC INLET & PRIMARY FUSE: Connects AC powercord and houses primary fuse. Always use correct value as indicated on amp panel chart.
Thank you for choosing a B-52 sound product. B-52 manufactures some of the worlds best sounding and most reliable professional speaker systems, amplifiers and components. E.T.I. Sound Systems, Inc., makers of B-52, takes great pride in thoroughly testing each B-52 product prior to shipment.

Limited Warranty

WARRANTY INFORMATION
This Limited Warranty is effective as of January 1, 2002. Any warranty claim on B-52 products purchased before this date may be subject to monetary charges. Warranty valid ONLY to original purchaser with PROOF OF PURCHASE.
B-52 CABINETS: E.T.I. Sound Systems, Inc. offers a LIFETIME warranty (effective January 1, 2002) to the original purchaser that a B-52's cabinet construction will be free from defects in material and workmanship. A dated sales receipt will establish coverage under this warranty. This warranty does not cover service or parts to repair damage caused by neglect, abuse, normal & wear and cosmetic appearance of the cabinetry not directly attributed to defects in material or workmanship, or service, repair, modifications of the cabinet, which has not been authorized or approved by E.T.I. If this product is defective in materials or workmanship as warranted above, your sole remedy shall be repair or replacement as provided above. LOUDSPEAKER AND MID-RANGE COMPONENTS: E.T.I. Sound Systems, Inc. warrants the original purchaser that B-52 loudspeakers and/or midrange components will be free from defects in material and workmanship for a period of (5) FIVE YEARS from the original purchase date (effective January 1, 2002). A dated sales receipt will establish coverage under this warranty. This warranty will automatically terminate (5) years after the original retail sales date. This (5) five-year warranty does not cover service or parts to repair damage caused by accident, disaster, misuse, abuse, burnt voice-coils, over-powering, negligence, inadequate packing or shipping procedures and service, repair or modifications of the component which has not been authorized or approved by E.T.I. This warranty is in lieu of all other expressed warranties. If this product is defective in materials or workmanship as warranted above, your sole remedy shall be repair or replacement as provided above. HIGH-FREQUENCY DEVICES: E.T.I. Sound Systems, Inc. offers a LIFETIME warranty (effective January 1, 2002) to the original purchaser that B-52 high frequency (tweeters) devices will be free from defects in material and workmanship. A dated sales receipt will establish coverage under this warranty. This warranty does not warranty neglect or abuse. NO WARRANTY IS OFFERED ON HIGH-FREQUENCY DEVICES IN B-52 SYSTEMS WITH A BI-AMP SWITCH OPTION. The lifetime warranty on high-frequency devices does not cover service or parts to repair damage caused by accident, disaster, misuse, abuse, negligence, inadequate packing or shipping procedures or service, repair or modifications of the product which has not been authorized or approved by E.T.I. This warranty is in lieu of all other expressed warranties. If this product is defective in materials or workmanship as warranted above, your sole remedy shall be repair or replacement as provided above. GUITAR AMPLIFIERS: E.T.I. Sound Systems, Inc. warrants the original purchaser that B-52 guitar amplifiers will be free from defects in material and workmanship for a period of (5) FIVE YEARS from the original purchase date (effective January 1, 2002). A dated sales receipt will establish coverage under this warranty. This warranty will automatically terminate (5) years after the original retail sales date. This (5) five-year warranty does not cover service or parts to repair damage caused by accident, disaster, misuse, abuse, over-powering, negligence, inadequate packing or shipping procedures and service, repair or modifications of the amplifier which has not been authorized or approved by E.T.I. This warranty is in lieu of all other expressed warranties. If this product is defective in materials or workmanship as warranted above, your sole remedy shall be repair or replacement as provided above. GUITAR AMPLIFIER TUBES: E.T.I. Sound Systems, Inc. warrants the original purchaser that amplifier tubes used in B-52 Stealth Series All-Tube Amplifiers will be free from defects in material and workmanship for a period of 90 DAYS from the original date of purchase (effective January 1, 2002). A dated sales receipt will establish coverage under this warranty. This warran-

ty will automatically terminate 90 Days after the original retail sales date. This 90-Day warranty does not cover service or parts to repair damage caused by accident, disaster, misuse, abuse, over-powering, negligence, inadequate packing or shipping procedures and service, repair or modifications of the amplifier which has not been authorized or approved by E.T.I. This warranty is in lieu of all other expressed warranties. If this product is defective in materials or workmanship as warranted above, your sole remedy shall be repair or replacement as provided above.
NEVER RETURN THE ENTIRE CABINET__JUST THE DEFECTIVE COMPONENT. Identify and remove the defective component. If you are uncertain which component is defective, or need directions for removing a component, please contact our Customer Service Department for assistance. Components which are a part of an original B-52 speaker box must be sent directly to E.T.I. Products must be shipped in the original packaging or its equivalent; in any case, the risk of loss or damage in transit is to be borne by the purchaser. The Return Authorization Number must appear in large print directly below the shipping address. Always include a brief description of the defect, along with your correct return address and telephone number. When calling to inquire about a returned product, always refer to the Return Authorization Number. If E.T.I. determines that the unit was defective in materials or workmanship at any time during the warranty period, E.T.I. has the option of repairing or replacing the product at no additional charge, except as set forth below. All replaced parts become a property of E.T.I. Products replaced or repaired under this warranty will be returned via ground-shipping-within the United States-freight prepaid. E.T.I. is not responsible for costs associated with expedited shipping, either to E.T.I. or the return of the product to the customer. INCIDENTAL OR CONSEQUENTIAL DAMAGE: In no event will E.T.I. be liable for any incidental or consequential damages arising out of the use or inability to use of any B-52 product, even if E.T.I. or a B-52 dealer has been advised of the possibility of such damages, or any other claim by any other party. Some states do not allow the exclusion or limitation of consequential damages, so the above limitation and exclusion may not apply to you. This warranty gives you specific legal rights and you may also have other rights which may vary from state to state. FOR YOUR PROTECTION: Please complete and mail the Purchase Information Card within (10) ten days of the date of purchase so that we may contact you directly in the event a safety notification issued in accordance with the 1972 Consumer Product Safety Act. In addition, we ask that you complete the brief questionnaire so me may analyze your answers and in this way, help us evaluate our customer needs. CUSTOMER SERVICE: Our dedicated staff is ready to help you with any B-52 warranty or product questions you may have. Please call 323-277-4100 (9:00AM to 4:00PM Pacific Standard Time, United States).

RETURN PROCEDURES: In the unlikely event that a defect should occur, follow the procedure outlined below. Defective products must be shipped, together with proof of purchase, freight pre-paid and insured to the Authorized B-52 Dealer from whom you purchased the product or directly to E.T.I. Sound Systems. If a product must be returned to E.T.I. Sound Systems for warranty replacement/repair, a Return Authorization Number must be obtained from our Customer Service Department prior to shipping the product.
E.T.I. Sound Systems, INC.
3383 Gage Ave., Huntington Park, CA, 90255

EXPERIENCE THE POWER!

www.B-52GUITAR.com

R51 B+4 SW1 BRIGHT CTL1 +12V TRANSFORMER 1U/50V

C36 B+3

4K7/1W
C12 100P/1KV C6 C16 0.022U/400V RL6 R56 220K 7 IN 7 V2-2 12AX7 12AT7 C38 470P/250V V10-1 V10-2 12AT7 R144 10K R23 4K7 0.0022U/400V C39

C31 10UF/450V D4 1N4004

VS6012 PRI

SEC R60 220K

JK2 R17 100K R15 C13 C11 250P/1KV 2 V2-1 12AX7 R22P/1KV 0.022U/400V 10M VR4 05A1M BASS VR2 A250K CLEAN VOLUME R58 1M R16 4K7 3M3 RLOHM R65 150K 3

R18 100K

100P/1KV

R6 100K TREBLE VR1 A250K

250P/1KV

R13 100K

REVERB R63 BL2AB2C1B 10K OUT 2.25K 6.3V~

C40 0.001U/250V R62 220K

0.1U/250V

REVERB LEVEL

VR12 B250K

V1-1 12AX7

R14 3M3
HIGH D6 CTL2 R20 1K5 C15 10UF/50V 1U/50V C41 10U/50V R24 470K C38A
1N4004 +12V R66 220K R59 820R VR3 B10K R19 1K5 R22 220K MIDDLE

1N4004

6.3V~ 6.3V~

R4 1K5

C6 10U/50V

R8 3M3

1U/50V

0.047U25/400V

R61 820

C42 10U/50V

R64 220K
CTL1 D5 VR12A 05A1M VR10 05A1M TO R89 H11F1 1N4004

TO Q11

4 LCR-0202
R9 R52 4K7/1W R35 100K 1 V4-LED4 1K5 C29 330P/1KV V11-1 12AXR46 220K 0.1u/250V R67 1M C30 R44 560R D3 1N4004 R55 3M3 C35 1U/50V +12V R54 3M3 R45 33K VR11 A500K CONTOUR 0.0033U/250V R69 560R 3 C43 R47 220K 6 RED RLR38 220K 12AX7 C28 1U/250V V3-2 250P C24 470P/500V RL3 C41A R49 330K 0.1U/250V C40A 470P C27 V4-2 12AXOVERDRIVE 12AX7 R53 B+4 R34 100K C21 R36 470K 3
LEVEL1 LEVEL2 OVERDRIVE MUTE

C5 C32 10UF/450V

R12 470K

GREEN LED3 CLEAN

R7 C19 100P/1KV

C3 470P/1KV

0.001U/250V

R11 220k

R27 1M

C34 1U/50V

B+3 R5B 150K R2B 100K R72 100K R73 1.5M C48 10P/1KV
0.022U/400V V3-1 12AX1 0.022U/400V

C18 0.001U/250V

GAIN2 6.3V~

C7 0.0047U/250V 3

V1-2 TREBLE VR7 B250K R42 33K R33 2K7 R41 100K C25 0.022U/400V R40 100K C26 0.022U/400V CTL3 VR9 B25K MIDDLE C22 0.68U/50V R37 470K R39 1K5 C23 10U/50V BASS VR8 A1M R43 1M

VR6 A1M

C17 0.001U/250V

R25 1M

R31 33K

SEND 6.3V~

C44 1UF/250V JK10

R32 3M3

V11-2 C46 12AX0.1U/400V 7 R74 1K5 VR13 B50K R68 33K MASTER 8 R4B 100K VR17 A500K 0.1U/250V

RED GAIN1 LED1

6.3V~ SEND LEVEL

R1B 10R

R10 470K

R5 4K7

R26 220K

R56A 220k

VR5 05A1M
1K5 LED2 GAIN2 GREEN U6 HIF2 F4 F1A TO U2-PIN2 AT100-5H R6 R130 100R +12V 100R C84 220u/250V C87 100u/250V R129 C86 100u/250V C83 220u/250V 220K/1W C88 100u/250V CHOKE R135 R138 220K C85 47u/250V R141 220K R137 1K2/1W B+1 B+2 B+3 B+4

R71 1M

R70 1K5

C47 22U/50V

R203 10K 1

RETURN LEVEL

R3B 22K RL7 +12 R140 10K/2W TO Q12 LOOP CTL VR14 A250K

Q202 2SC1815

JK9 RETURN

R201 100K

2SC1015

YELLOW

U3 PIN2
D7 1N4004 B+2 C1A 1U/50V B+2

TO RL3

Q9 2N5551

R134 R136

LAMP1 RED

V12 5AR4

220K/1W

C59 0.1uF/100V

R1A 10K

R98 10K

IC11F CD4069

REVERB MUTE

Q11 2N5401
R109 100k R106 R139 220K 470R/2W R142 220K

R110 4k7 VC89 100u/250V C90 47u/250V R105 470R/2W

C65 0.047U/630V

6.3V 150MA

IC11E CD4069

Q7 2N5551

C55.1UF/100V

V7 5881
R108 82k C69 100P/500V 1 V5-R115 4k7 12AX7 3

C71 0.022U/250V B

Q10 2N5551

REVERB /EFFECT

LOOP CTL TO RL7 Q12 52N551 R2A 100K

Q8 2N5551

R94 100K

SW8 SK-22F06-G10

LOAD IMPANDANCE SELECT
OUTPUT SPTT R103 47R 16R OT1 8R B+5 4R

R92 4K7

D6A R3000
13 F2 STANBAY SW D11 1N4007 C75 0.01U/1KV C76 0.01U/1KV TRANS5 F3 F1.5A 1N4007 +12V D10 D12 1N4007 A F1.5A D9 1N4007 RL8

IC2B 10 CD4072 11

C2/C3 TO MODE SW D8 R3000 BIAS R95 110R/15W TO MODE SW B WIPER

R112 220k

R116 1M

.1UF/100V

0.1uF/100V

R3A 4K7 TRANSFORMER

R117 470R

R119 10K/1W

R85 4K7
SW10 A1 R3000 A3 B1 B2 TO BIAS B B3 C1 C C2 C3 JK8 D1 OUT JACK R102 10K/1W D D2 +12V D3 R107 470R/2W

Q4 2N5551

Q3 2N5551

D7A V8 5881

R113 220k R111 JK7

TO RL1 RL4 RL5 CTL1

R77 10K

R78 10K

R89 820R

0.1uF/100V RT1 C60-11

R87 100K

IC11A CD4069

IC4 CD4072

Q1 2N5551

Q2 2N5551
IC11D CDBD1 BR2 R124 100R/5W 3

CHANNEL/GAIN

C49 0.1u/100V

R104 470R/2W

470K R81

470K R82

R79 470K

R80 470K

R88 4K7

SW6 F1 FUSE2

120V F5A/250V 230V T2.5A/250V
U4 LM317 Vin Vout 1 R131 2

CHANNEL

IC11C CD4069 AC

TO RL2,RL6

JK3 C220R C77 1000U/63V R132 1.8K C81 22U/50V C79 22U/63V

R121 1K5

C53 0.1uF/100V

VR15 A5K R103A 1K5

R122 82K 0.1U/100V

VR16 A1M LINE OUT

C54 0.1uF/100V

Q5 2N5551 SW3 GAIN2

GAIN1/GAIN2

Q6 2N5551

IC11B 4069

SW2 GAIN1

C82 R128 22K R125 100R/2W C78 220U/63V VR18 B5K 3 4

C50 0.1U/100V

10U/63V R126 6K8

R127 68K

V9 5881
4k7 R114 4k7 C68 0.047U/630V

R118 1M