Index of /files/Vintage Electronics/Audio/Amplifiers/_Circuits/
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100 amplifiers - part 2, 1955 - 1982.mht 14-Apr-2015 18:35 51M
100 amplifiers – part 1, 1916 - 1954.mht 14-Apr-2015 18:18 96M
10W Tube Power Amplifier 1955-04.pdf 12-Jun-2023 18:09 354K
10W Tube Utility Amplifier.pdf 14-Jul-2024 02:34 50K
120W Power Amplifier with 6550.jpg 16-Mar-2015 22:47 89K
140W Tube Power Amp.pdf 09-Aug-2020 04:18 2M
15W Amplifier with positive feedback tone shapi..> 20-Dec-2023 04:57 2M
15W Northcourt Amplifier.jpg 08-Apr-2015 18:05 109K
15W RCA Audio Power Amplifier.gif 02-Mar-2001 05:14 85K
18W Tube Power Amp with 2X EL4.gif 01-Oct-2015 18:53 6809
25W Power Amplifier,6SN7,6L6.gif 08-Apr-2015 17:05 27K
25W Power Amplifier,6SN7,EL34.gif 08-Apr-2015 17:29 48K
30 Watt High Fidelity Audio Amplifier 1947.pdf 31-Mar-2025 01:49 260K
30W Class A Push Pull Power Amp.jpg 12-Sep-2004 01:17 94K
30W Classical AMplifier with Error Correction.jpg 12-Sep-2004 01:17 89K
35W High Fidelity Tube Amplifier.pdf 20-Dec-2020 04:52 357K
35W Power Amplifier with 12AT7 drive.gif 08-Apr-2015 16:47 30K
35W Power Amplifier,6SN7,EL34.gif 08-Apr-2015 17:29 50K
36W Basic Tube Power Amplifier.pdf 28-Dec-2024 04:44 2M
4 X EL84 Power Amp with ECC81 input.jpg 01-Oct-2015 19:53 65K
50W Power Amplifier,6SN7,6550.gif 08-Apr-2015 17:29 43K
54W Tube PA Amplifier.pdf 05-Mar-2020 05:10 131K
6AS7G Amplifier For Residence Audio Systems 194..> 31-Mar-2025 01:46 584K
6L6 Power Amplifier.jpg 08-Apr-2015 17:05 185K
6L6 basic Amplifier.jpg 14-Apr-2015 16:38 97K
6SN7 Driver Board.jpg 16-Mar-2015 21:47 113K
6U8A to replace the 7199.pdf 16-Mar-2015 16:44 24K
7199 Tube RCA Application Notes.mht 18-May-2016 20:25 85K
88-50 Low Distortion 50W Amplifier.pdf 09-Nov-2023 00:07 2M
9.5W Class A Triode Tube Power Amplifier.pdf 09-Aug-2020 03:18 1M
A Practical Cathode -Follower Audio Amplifier 1..> 06-Apr-2025 02:28 262K
A Transformer for a Single-valve Output Stage 1..> 14-Mar-2025 02:23 222K
AUDIO and RF MODULATOR TETRODE, PENTODE AND BEA..> 21-Apr-2015 21:19 3M
Brociner Mark 10 Integrated Audio Amplifier.pdf 10-Apr-2023 23:04 406K
Cascode Tube Line Level Tone-amp.gif 24-Jan-2012 19:09 34K
Cascode Tube Preamp.gif 24-Jan-2012 19:08 57K
Cevni-poj Tube Pre-amp.pdf 17-Feb-2011 06:16 242K
Choosing and Using Vacuum Tubes.pdf 07-Oct-2015 22:13 1M
Compact Amplifier for Residence Audio Systems P..> 15-Nov-2023 22:09 771K
Connecting 2 Tube Amplifiers in Parallel.pdf 22-Apr-2025 00:52 158K
Design of Tube Class-B Drivers.pdf 09-Feb-2020 22:58 138K
Designing Push-Pull Tube Amplifiers.pdf 12-Feb-2020 22:56 210K
Dixey 76 Power Amplifier.jpg 08-Apr-2015 18:05 101K
Dixey 77 Power Amplifier.jpg 08-Jan-2014 02:53 128K
EL84 Amp with ECC83 input.jpg 01-Oct-2015 19:53 61K
EL84 Amp.jpg 25-May-2016 18:37 114K
EL84 Based Power Amp.jpg 16-May-2016 15:41 114K
EL84 Push Pull Valve Amplifier.mht 07-Oct-2015 22:41 400K
EL84 based Power Amplifier.jpg 25-May-2016 18:37 101K
EL84-ECC81 Amp.jpg 05-Nov-2015 04:17 95K
EMT Stereo Tube Amp.jpg 04-Feb-2011 19:22 174K
Four Channel Vacuum Tube Mixer.pdf 01-Feb-2019 03:45 4M
Fully Balanced Tube Preamp.jpg 24-Jan-2012 19:10 108K
Fully Differential Tube Power Amplifier.jpg 14-Apr-2015 17:38 116K
Hashimoto KT88 Schematic.jpg 16-Mar-2015 19:36 144K
Hi-Fi 35W Amplifier 1948-04.pdf 07-Jan-2024 02:28 357K
High Quality Amplifiers.mht 14-Apr-2015 17:55 1M
High Quality Dual-Channel Amplifier 1956.pdf 11-Jun-2025 22:06 349K
High Quality Treble Amplifier 1957.pdf 18-Jun-2025 01:08 213K
Improving the Williamson Amplifier.pdf 16-Mar-2009 01:55 292K
Low Power Cathode Coupled Amplifier 1949.pdf 31-Mar-2025 02:51 77K
MISCELLANEOUS TUBE AMPLIFIER SCHEMATICS 2.mht 08-Apr-2015 17:04 533K
More tube hybrid circuits.mht 08-Apr-2015 18:36 48K
Multi-Purpose Audio Amplifier 1947.pdf 11-Jun-2025 21:29 3M
Musician's Amplifier (Williamson) 1949.pdf 06-Apr-2025 02:29 312K
Optimized ultra-linear HI-FIDELITY ELECTRON TUB..> 14-Apr-2015 16:35 2M
PAIA 9305 Tubehead Manual.pdf 31-Jul-2008 07:05 314K
Patent Drawing for First Amplifier Circuit.pdf 06-May-2025 02:12 171K
Plitron Tube Amplifier Circuit Board.mht 08-Apr-2015 16:49 534K
Power Amp with EF86.jpg 17-May-2016 23:14 64K
Power Amplifier - Optimised Ultra Linear .mht 08-Apr-2015 17:33 2M
Power Amplifier using 6L6G Output Tubes.mht 14-Apr-2015 18:49 225K
Power Amplifier,6550,Variable Damping.jpg 05-May-2015 00:14 132K
Power Amplifier,Class A,12SL7-KT88.png 08-Apr-2015 17:37 20K
Power Amplifiers 1959.pdf 12-May-2025 03:41 6M
Power amplifier with 6SN7 Drivera & KT88 Output..> 16-Mar-2015 22:47 114K
Practical Amplifier Diagrams-Lipman 1947.pdf 08-Aug-2020 00:01 3M
Preamp Tube Gain Factors And Substitution Chart..> 21-Apr-2015 16:53 1M
Purple Cow.gif 07-Oct-2015 21:28 139K
Push Pull Tube Phase Splitter aka Cathodyne Pha..> 10-Apr-2025 20:41 261K
Quad EL84 Amp.jpg 05-Nov-2015 04:18 45K
ST-70 Clone PCB with power tubes on PCB.jpg 01-Jun-2015 16:04 20K
Simplified 20W Power Amplifier.pdf 06-Apr-2024 05:10 3M
Single Ended Push Pull W.jpg 22-Sep-2004 05:38 126K
Six Tube Amplifier.pdf 05-Feb-2019 05:28 523K
Star Grounding in Tube Amplifiers.mht 06-Mar-2014 20:31 100K
Star grounding tube amps.pdf 10-Jun-2011 18:03 20K
Stereo Amplifier Reviews Dynaco Stereo 70 Tube ..> 06-Apr-2015 18:07 439K
Stu Rubin's 10w Tube Amp Circuit.jpg 01-Apr-2002 10:20 93K
The Cathode Follower.mht 08-Apr-2015 18:53 43K
The Emperor's New Amplifier.mht 14-Apr-2015 20:49 479K
The Sound of Rectifier - Tube Maze.mht 21-Apr-2015 16:35 357K
This is a schematic for the VTA ST-70 - 3 x 12A..> 14-Mar-2015 00:09 291K
Triode Operation of Audio Power Tubes.pdf 20-Jan-2020 22:32 255K
Triode Operation of Pentodes.jpg 21-Apr-2015 21:09 202K
Triode power amplifier_.mht 14-Mar-2016 22:27 65K
Trouble Shooting Issues with 1950s Hi-Fi Gear.pdf 26-Apr-2025 00:44 640K
Tube Amplifier Crackling Noises - What to Look ..> 21-Apr-2015 16:47 1M
Tube Autobias Doodle.pdf 04-Jul-2018 17:36 182K
Tube Buffer.jpg 16-Feb-2011 18:51 71K
Tube DIY Asylum.mht 20-Jul-2016 22:34 1M
Tube Electret Condenser Mic Pre .jpg 24-Jan-2020 05:22 1M
Tube Power Amp with Auto Bias.gif 08-Apr-2015 16:47 69K
Tube Pre.jpg 16-Feb-2011 18:51 61K
Tube-MOSFET hybrid OTL PP V-to-I Amplifier Larg..> 20-Jan-2020 01:06 119K
Tube-MOSFET hybrid OTL PP V-to-I Amplifier Larg..> 05-Nov-2013 22:23 50K
Tubeampprotect700X464H.jpg 22-Sep-2004 06:54 110K
Two Way Stereophonic Amplifier.pdf 06-Apr-2024 04:03 941K
Two-Way Stereophonic Amplifier.pdf 16-Dec-2024 03:24 801K
ULTRA-LINEAR High Fidelity Vacuun Tube Audio Am..> 14-Apr-2015 16:36 1M
UTC 25W Tube Amplifier.jpg 08-Apr-2015 17:29 333K
UTC 35W Tube Amplifier.jpg 08-Apr-2015 17:29 352K
UTC 50W Tube Amplifier.jpg 08-Apr-2015 17:29 309K
Ultra Linear Tube Amplifiers.mht 10-Jan-2017 21:37 1M
Ultra Linear-trans-amp.gif 08-Apr-2015 17:32 26K
VTA trying to reel in the beast - AudioKarma_or..> 16-Mar-2015 23:25 2M
Vacuum Tube Audio Output Plitron.mht 08-Apr-2015 17:33 330K
Valve Technology.mht 20-Jul-2016 22:33 2M
Van Alstine Notes on Tube Power Amp Design.zip 02-Oct-2024 00:51 3M
Vintage Tube Amplifier Schematic Assortment .mht 14-Apr-2015 17:54 5M
Voltage References.mht 08-Apr-2015 18:53 40K
Williamson Ampifier Update with Transformer Win..> 17-Jun-2025 02:10 369K
Williamson Amplifier (Collection of Articlees f..> 20-Oct-2016 16:15 3M
Williamson Amplifier Schematic 1949.pdf 14-Apr-2015 16:28 108K
Williamson Amplifier, The.pdf 21-Aug-2020 23:13 3M
Williamson WW 1949.pdf 14-Apr-2015 16:42 563K
stereopowerampschematic.gif 25-Sep-2015 01:27 28K
tubetech_mp1a.gif 29-Jun-2011 18:20 103K
vacuum tube valve circuit Audio Circuits Next..> 19-Jul-2016 17:01 3M