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Some diagrams and schematics from RCA BC100 broadcast mixer to follow.
 

Attachments

  • rca preamp.jpg
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Soldering Iron Kit, 90W 110V LCD digital soldering gun，12-in-1 Soldering Iron Kit Tool，Temperature adjustable from 180-480°C，5 soldering tips，soldering wire，soldering paste，soldering pump
$20.99
Soldering Iron Kit, 90W 110V LCD digital soldering gun，12-in-1 Soldering Iron Kit Tool，Temperature adjustable from 180-480°C，5 soldering tips，soldering wire，soldering paste，soldering pump MEAKEST
Muzata 10 Gauge Amplifier Installation Kit with RCA Interconnect and Speaker Wire, Car Audio Subwoofer Wire, AMP Wiring, Auto Audio Cables M027
$9.99
Muzata 10 Gauge Amplifier Installation Kit with RCA Interconnect and Speaker Wire, Car Audio Subwoofer Wire, AMP Wiring, Auto Audio Cables M027 Muzata
WEP 927-IV Soldering Station Kit High-Power 110W with 3 Preset Channels, Sleep Mode, LED Magnifier, 5 Extra Iron Tips, Tip Cleaner, 2 Helping Hands, Tip Storage Slots, Lead-free Solder Wire, Tweezers
-40%
$47.99 $80.00
WEP 927-IV Soldering Station Kit High-Power 110W with 3 Preset Channels, Sleep Mode, LED Magnifier, 5 Extra Iron Tips, Tip Cleaner, 2 Helping Hands, Tip Storage Slots, Lead-free Solder Wire, Tweezers WEP TOOLS
Schematics 2 Audio amplifiers and loudspeaker boxes
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Schematics 2 Audio amplifiers and loudspeaker boxes Book Smart Now
How to see audio schematic
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How to see audio schematic nanjingchuanglingweilaikejiyouxiangongsi
MiOYOOW DIY Bluetooth-Compatible Speaker Kit with FṂ Radio, Electronic Soldering Practice Kit USB Mini Home Sound Amplifier DIY Kit with Digital Display and Colorful LED Lights for School STEM Project
$25.99
MiOYOOW DIY Bluetooth-Compatible Speaker Kit with FṂ Radio, Electronic Soldering Practice Kit USB Mini Home Sound Amplifier DIY Kit with Digital Display and Colorful LED Lights for School STEM Project WHDTS
BOSS Audio Systems KIT2 8 Gauge Complete Car Amplifier Installation Wiring Kit with Power Cables, Ground Cables, Turn-On Wire, Speaker Wire, Terminals
-19%
$18.69 $22.99
BOSS Audio Systems KIT2 8 Gauge Complete Car Amplifier Installation Wiring Kit with Power Cables, Ground Cables, Turn-On Wire, Speaker Wire, Terminals Speece, Inc.
ICStation DIY Bluetooth-Compatible Speaker Kit, Soldering Practice Kit with Rechargeable Battery Mini Home Outdoor Stereo Sound Amplifier,USB, AUX, SD Card, Perfect for DIY Electronic Kits
$28.99
ICStation DIY Bluetooth-Compatible Speaker Kit, Soldering Practice Kit with Rechargeable Battery Mini Home Outdoor Stereo Sound Amplifier,USB, AUX, SD Card, Perfect for DIY Electronic Kits IS-Circuit
CYOEST DIY Bluetooth Speaker Box Kit Electronic Sound Amplifier - Build Your Own Portable Wood Case Bluetooth Speaker Sound - Science Experiment and STEM Learning for Kids, Teens and Adults
$14.99
CYOEST DIY Bluetooth Speaker Box Kit Electronic Sound Amplifier - Build Your Own Portable Wood Case Bluetooth Speaker Sound - Science Experiment and STEM Learning for Kids, Teens and Adults Z- horse
Guitar Electronics Understanding Wiring and Diagrams: Learn step by step how to completely wire your electric guitar
$13.99
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MiOYOOW DIY Bluetooth-Compatible Speaker Kit, Mini Stereo Sound Amplifier Soldering Projects with LED Flashing Light, Electronic Soldering Practice Kit for School STEM Education and Home Office Use
$28.99
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The Tube Amp Book
-23%
$52.27 $68.00
The Tube Amp Book Publisher Direct
Soldering Iron Kit 80W LCD Adjustable Temperature 180-520℃ Solder Kit Electronics 13 in 1 Welding Tools with ON/OFF Switch, Solder Wire, Flux, 5 Soldering Tips, Desoldering Pump, Stand, Tweezers
$21.23
Soldering Iron Kit 80W LCD Adjustable Temperature 180-520℃ Solder Kit Electronics 13 in 1 Welding Tools with ON/OFF Switch, Solder Wire, Flux, 5 Soldering Tips, Desoldering Pump, Stand, Tweezers TOP88
Clear Premium Soldering Iron Kit - Adjustable Temperature, Fast Heat, 8 Tips Ceramic Tweezer, Solder, Pump, Flux, Case Precision 392-932°F Professional & Hobby 68W Soldering Gun 2in1 Wood Burning Kit
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$19.99 $33.99
Clear Premium Soldering Iron Kit - Adjustable Temperature, Fast Heat, 8 Tips Ceramic Tweezer, Solder, Pump, Flux, Case Precision 392-932°F Professional & Hobby 68W Soldering Gun 2in1 Wood Burning Kit Inside Insight
EIELE DIY Blutoth-Compatible Speaker Kit Multi-Function Soldering Practice kit Voice-Activated Level Indicator Dual Channel Speaker for Soldering Project Transparent Speaker
$25.99
EIELE DIY Blutoth-Compatible Speaker Kit Multi-Function Soldering Practice kit Voice-Activated Level Indicator Dual Channel Speaker for Soldering Project Transparent Speaker HYIC
Home audio systems schematic/servicing manual
$70.01
Home audio systems schematic/servicing manual Fables Books Goshen
Electronics Soldering Iron Kit, 80W LCD Digital Soldering Gun with Adjustable Temperature Controlled and Fast Heating Ceramic Thermostatic Design, 24pcs Solder Kit Welding Tool
$21.99
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The Tube Amplifier Schematic Bible Volume 1: Library of Vintage Tube Amps (A-F) (Manufacturers A-F)
$24.99
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BANRIA DIY Bluetooth-Compatible Speaker Kit, DIY FM Radio Soldering Project USB Mini Home Sound Amplifier Electronics Kit with Digital Display & LED Lights Soldering Practice Kit
$27.99
BANRIA DIY Bluetooth-Compatible Speaker Kit, DIY FM Radio Soldering Project USB Mini Home Sound Amplifier Electronics Kit with Digital Display & LED Lights Soldering Practice Kit IC-Board
Automotive Wiring and Electrical Systems (Workbench Series)
-23%
$26.90 $34.95
Automotive Wiring and Electrical Systems (Workbench Series) Amazon.com
YIHUA 926 III 60W Digital Display Soldering Iron Station Kit w 2 Helping Hands, 6 Extra Iron Tips, Lead-Free Solder, Solder Sucker, S/S Tweezers, °C/ºF Conversion, Auto Sleep & Calibration Support
-33%
$39.99 $59.99
YIHUA 926 III 60W Digital Display Soldering Iron Station Kit w 2 Helping Hands, 6 Extra Iron Tips, Lead-Free Solder, Solder Sucker, S/S Tweezers, °C/ºF Conversion, Auto Sleep & Calibration Support YIHUA OFFICIAL STORE
Electronics Soldering Iron Kit, [Upgraded] Soldering Iron 110V 90W LCD Digital Portable Soldering Kit 180-480℃(356-896℉), Welding Tool with ON/OFF Switch, Auto-sleep, Thermostatic Design
$18.88
Electronics Soldering Iron Kit, [Upgraded] Soldering Iron 110V 90W LCD Digital Portable Soldering Kit 180-480℃(356-896℉), Welding Tool with ON/OFF Switch, Auto-sleep, Thermostatic Design HANDSKIT
Dasiter OCL Amplifier Board Kit Dual 100W High Power Two-Channel Pure Final Stage DIY Audio Stereo Amplifier Module Parts
$13.99
Dasiter OCL Amplifier Board Kit Dual 100W High Power Two-Channel Pure Final Stage DIY Audio Stereo Amplifier Module Parts Dasiter
Soldering Iron Kit Electronics, Soldering Iron 60W Adjustable Temperature, Solder Wire, Wire Stripper, Desoldering Pump, Tweezers, Solder Tips, Mini Stand, Screwdrivers, Heatshrink Tubes from Plusivo
-30%
$5.59 $7.99
Soldering Iron Kit Electronics, Soldering Iron 60W Adjustable Temperature, Solder Wire, Wire Stripper, Desoldering Pump, Tweezers, Solder Tips, Mini Stand, Screwdrivers, Heatshrink Tubes from Plusivo Tanovedio
PenRux DIY Bluetooth Speaker Box Kit Electronic Sound Amplifier, DIY Electronics Projects Building Sets,Build Your Own Portable Wood Case Bluetooth Speaker with Sound, for Teens, Adults
$15.02
PenRux DIY Bluetooth Speaker Box Kit Electronic Sound Amplifier, DIY Electronics Projects Building Sets,Build Your Own Portable Wood Case Bluetooth Speaker with Sound, for Teens, Adults Depisuta-US
Soldering Iron Kit, 80W 110V LCD Digital Soldering Welding Iron Kit with Ceramic Heater, Portable Soldering Kit with 5pcs Tips, Stand, Solder Tube, Sponge, Solder Paste,for Metal,Electric, DIY
-23%
$9.96 $12.99
Soldering Iron Kit, 80W 110V LCD Digital Soldering Welding Iron Kit with Ceramic Heater, Portable Soldering Kit with 5pcs Tips, Stand, Solder Tube, Sponge, Solder Paste,for Metal,Electric, DIY MINGQ
Make: Analog Synthesizers: Make Electronic Sounds the Synth-DIY Way
-15%
$19.53 $22.99
Make: Analog Synthesizers: Make Electronic Sounds the Synth-DIY Way Amazon.com
The Sound Reinforcement Handbook
-10%
$31.46 $34.95
The Sound Reinforcement Handbook Amazon.com
Soldering Iron Kit, 60W Soldering Iron with Interchangeable Iron Tips, 10-in-1 Adjustable Temperature Soldering Welding Iron Kit for any Hobby Enthusiast 110V US Plug
-22%
$11.69 $14.99
Soldering Iron Kit, 60W Soldering Iron with Interchangeable Iron Tips, 10-in-1 Adjustable Temperature Soldering Welding Iron Kit for any Hobby Enthusiast 110V US Plug MINGQ
Troubleshooting & Repairing Consumer Electronics Without a Schematic
$46.00
Troubleshooting & Repairing Consumer Electronics Without a Schematic Amazon.com
Instructions for RCA 41-B
[submitted by: dmp]
 

Attachments

  • RCA41B-1935.pdf
    2.4 MB
UOAB schematic and notes
[submitted by: pucho812]
 

Attachments

  • UOAB-notes.pdf
    6.7 MB
RCA BA-72A, very often found as part of the BA-41A package which replaced the BA-31 standalone. 
 

Attachments

  • BA-72A.jpg
    BA-72A.jpg
    849.8 KB
MI-9357A theater preamp.  Some of these output transformers are really 10K DCR primary, some are not.  Curious. 
 

Attachments

  • MI-9357A.jpg
    MI-9357A.jpg
    400.1 KB

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