Acrosound transformer catalog with specs and vacume tube schematics
Altec Lansing 1568A Tube amp manual with schematic
"New" Large Advent speaker brochure (courtesy AK'er LBPete)
"A tube primer" by Myles S. Rose of Guitar Amplifier Blueprinting
Audio Research Dual-100 brochure
Audio Research SP-1A brochure
"Class A Exposed & Explained" by Randall Smith of MESA ENGINEERING
Denon DVD-800 New Model Information
Denon AVC-A1SR & DVD-A1 Catalog
Denon AVC-A11SR New Model Information
Denon AVR-3802 New Model Information
Denon AVR-1800 New Model Information
Denon AVR-2800 New Model Information
Denon AVR-3300 New Model Information
Denon AVR-3801 New Model Information
Denon AVR-3802 New Model Information
Denon AVR-5803 New Model Information
Denon DVD-2800 New Model Information
Denon DVD-2800 (Tentative) New Model Information
Denon DVD-2900 (Tentative) New Model Information
Denon DVD-3800 New Model Information
Design Acoustics PS Series Owners Manual (courtesy Charivari)
Design
of a Back Loaded Exponential Horn 
Warum
heißen Elektrostaten eigentlich Elektrostaten ?
Dynaco SCA-35 Service Manual (courtesy Charivari)
Fried Model M brochure
Kenwood 500/600/650 Service Manual
Klipschorn Japanese brochure
Krell KSA-100 schematic
Luxman 2006 Japanese catalog
Mactone catalog
Marantz 2500 Service Manual
Marantz PM-6a Service Manual (courtesy Mr. Mickael Brient)
Marantz SR-1100L Service Manual (courtesy Tricomp)
Mcintosh
Perfect Amplification
Mcintosh Platinum Premier
Nakamichi Dragon brochure
Nakamichi Dragon CD/DAC Limited Service Manual
Pioneer SX-727 Service Manual (courtesy Charivari)
Pioneer SX-727 Review (courtesy Charivari)
Mactone catalog
Read
Recording complete reference 807 pages, 1952
Sansui Vintage Japanese catalog
Sansui 771 Service Manual (courtesy Mr. Zdravko K)
Sansui B-2102 Service Manual (courtesy AK'er Tricomp)
Sansui AU-D11 Schematic (courtesy AK'ers joemango and bolly)
Sansui AU-D11 Service Manual (courtesy AK'er Onepixel)
Sansui AU-555A Owners & Service Manual (courtesy AK'er Richka)
Sansui AU-X701 Owners Manual (courtesy AK'er Ggarcia)
Sansui A-60/A-80 Service Manual
Sansui 441 Service Manual
Sansui QRX-5500 Service Manual
Sansui G-2000SS/G-2000L/G-3000L Service Manual
Sansui A-1100/A-1130 Service Manual
Sansui SC-5300/SC-5330/SC-77 Schematic
Sansui G-8000/801 & G-9000/901 Service Manual
Sansui 9090/8080 Service Manual
Sansui QRX-4500 Owners & Service Manual
Sansui Model 1000A Schematic
Sansui 3000 Owners Manual (courtesy AK'er SilverHalo)
Sansui 3000 Service Manual (courtesy AK'er SilverHalo)
Sansui 3000 Schematic (courtesy AK'er SilverHalo)
Sansui 5000X Owners Manual (courtesy AK'er SilverHalo)
Sansui 5000X Service Manual (courtesy AK'er SilverHalo)
Sansui 9090db Schematic (courtesy AK'er SpeakerLabFan)
Sansui 9090db Brochure (courtesy AK'er SpeakerLabFan)
Sansui 9090db Owners Manual (courtesy AK'er SpeakerLabFan)
Sony STR-7800SD Owners Manual (courtesy Mr. Denis Pinto)
Sony TA-2000F Schematic (courtesy AK'er Energyandair)
Sony TA-2000F Service Knobs Update (courtesy AK'er Energyandair)
Sony TA-3200F Service Manual (courtesy aafus)
Sony STR-V7 Brochure (courtesy AK'er Bill Brown)
Sony STR-V7 Owners Manual (courtesy AK'er Bill Brown)
Tannoy Autograph Japanese brochure
Tannoy Prestige brochure, UK version
Tannoy Prestige brochure, Japanese version, different from the UK version
Magnetic
Recording with Tape & Wire, 1952
Teac Esoteric P-01, D-01 Japanese brochure
"THEORY BEHIND AIR LINE TANGENTIAL AIR BEARING TONEARM" by Franc Kuzma
"What is the best loudspeaker and why?", by Winfield Secor, Radio News, March 1927
Yamaha CD, MD & Cassette Brochure
Yamaha 1999 Concert Series Full Line Catalog
Yamaha Concert Series Speaker Catalog
Yamaha New Products Catalog 2006
Yamaha AVC-3000 DSP History (translated)
Yamaha AVX-2000 DSP History (translated)
Yamaha DSP History (translated)
Yamaha DSP-1 DSP History (translated)
Yamaha DSP-3000 DSP History (translated)
Yamaha DSP-A3090 Owners Manual
Yamaha MX-1/MX-2 Owners Manual