Welcome To the Hoffman Amplifiers Forum
September 06, 2025, 06:17:40 am
Welcome To the Hoffman Amplifiers ForumSeptember 06, 2025, 06:17:40 am | ||
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cathode shared by 3 triodes.
Started by joesatch |
5 Replies
2406 Views |
August 13, 2023, 04:26:43 amby pdf64 |
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Mesa mark V 90 shenanigans
Started by nandrewjackson |
2 Replies
2066 Views |
August 12, 2023, 12:10:31 am by nandrewjackson |
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question for Sluckey
Started by labb |
2 Replies
1975 Views |
August 11, 2023, 08:31:03 pm by labb |
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Cathode resistor measuring odd
Started by jordan86 |
6 Replies
2423 Views |
August 11, 2023, 12:03:41 pm by tubeswell |
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Back in the saddle
Started by Nathan |
3 Replies
1935 Views |
August 11, 2023, 09:30:19 am by Nathan |
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6 Replies
2313 Views |
August 11, 2023, 07:46:28 am by Planobilly |
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300 - 500 ohm speakers
Started by Peter212 |
4 Replies
2704 Views |
August 10, 2023, 08:53:28 pm by PRR |
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Is this Power Section odd or not ??
Started by kagliostro |
3 Replies
2041 Views |
August 10, 2023, 07:28:33 pm by kagliostro |
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Soaring DC on power tubes
Started by Choan |
5 Replies
2389 Views |
August 10, 2023, 03:27:52 pm by tubeswell |
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Marshall PA Amp's in for servicing...
Started by TubeGeek |
8 Replies
5173 Views |
August 10, 2023, 02:58:52 pm by sluckey |
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2553 PT position
Started by Leevi |
8 Replies
2539 Views |
August 10, 2023, 02:26:36 pm by kagliostro |
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An old (complex) project being reactivated
Started by Dave |
11 Replies
3052 Views |
August 10, 2023, 10:28:33 am by acheld |
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Acoustic 370 Updates
Started by pbman1953 |
0 Replies
1694 Views |
August 09, 2023, 07:51:43 am by pbman1953 |
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Wiring in output transformer in jtm45
Started by timmyjoe |
5 Replies
2615 Views |
August 09, 2023, 04:33:37 am by pdf64 |
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1964 Fender Spring Reverb Unit 6G15
Started by Yeatzee |
17 Replies
5133 Views |
August 09, 2023, 03:33:33 am by Latole |
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20 gauge cloth wire
Started by timmyjoe |
1 Replies
1861 Views |
August 09, 2023, 12:28:24 am by PRR |
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2 Replies
2105 Views |
August 08, 2023, 09:40:30 pm by Planobilly |
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1 Replies
1869 Views |
August 08, 2023, 03:34:18 pm by sluckey |
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4 Replies
2132 Views |
August 08, 2023, 11:27:23 am by zephyrblau |
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Choke for 5f6a build
Started by Mypalmurph |
2 Replies
2008 Views |
August 08, 2023, 10:52:22 am by Mypalmurph |
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Reverb transformer grounding
Started by marshallguy |
5 Replies
2637 Views |
August 08, 2023, 05:55:13 am by marshallguy |
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Measuring V+(plate voltage)
Started by Champ_49 |
9 Replies
2960 Views |
August 08, 2023, 03:52:34 am by shooter |
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11 Replies
3165 Views |
August 07, 2023, 07:43:14 pm by sluckey |
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15 Replies
4311 Views |
August 07, 2023, 05:20:33 pm by mmack |
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EL34 vs 6L6 bias supply
Started by fossilshark |
2 Replies
2141 Views |
August 07, 2023, 02:39:11 pm by PRR |
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5e3 circuit with 500k pots?
Started by roseblood11 |
7 Replies
3061 Views |
August 07, 2023, 08:21:15 am by roseblood11 |
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SVT with a 600 Ohm input
Started by pbman1953 |
4 Replies
2369 Views |
August 05, 2023, 05:10:09 pm by pbman1953 |
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Attention Visio users!
Started by sluckey |
1 Replies
1942 Views |
August 05, 2023, 03:41:21 pm by kagliostro |
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Grounding schemes
Started by marshallguy |
2 Replies
1870 Views |
August 05, 2023, 01:50:58 pm by marshallguy |
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Amp startup issues - light bulb glowing
Started by jordan86 |
15 Replies
3676 Views |
August 05, 2023, 10:52:01 am by jordan86 |
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'68 AB763 Showman tremolo tick
Started by Esquirefreak |
0 Replies
1764 Views |
August 05, 2023, 08:17:01 am by Esquirefreak |
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Tremodrive Oscillator question
Started by TurboGuitarMelton |
5 Replies
2965 Views |
August 04, 2023, 11:54:44 pm by PRR |
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power supply bias design
Started by fossilshark |
4 Replies
2177 Views |
August 04, 2023, 11:03:01 pm by fossilshark |
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Mosfet reverb recovery
Started by Bieworm |
14 Replies
3861 Views |
August 04, 2023, 04:08:30 pm by PRR |
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9 Replies
2668 Views |
August 04, 2023, 01:14:50 pm by marshallguy |
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Multi amp switcher thing
Started by fossilshark |
9 Replies
3007 Views |
August 04, 2023, 01:12:53 pm by fossilshark |
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Alembic F-2B To Line Level Out
Started by AHeck |
7 Replies
2766 Views |
August 03, 2023, 09:37:27 pm by AHeck |
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FX series Loop design
Started by marshallguy |
11 Replies
3451 Views |
August 03, 2023, 09:23:04 pm by sluckey |
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21 Replies
4319 Views |
August 03, 2023, 07:24:38 pm by marshallguy |
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Presense and Resonance
Started by jim |
0 Replies
1664 Views |
August 03, 2023, 09:14:27 am by jim |
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Big problem with deluxe reverb 65
Started by Travis8 |
16 Replies
3374 Views |
August 03, 2023, 06:19:56 am by Latole |
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Using octal tube for a 'one tube' reverb
Started by smackoj |
40 Replies
10008 Views |
August 02, 2023, 06:08:38 pm by Jerry garrcia |
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Variac tested
Started by Colas LeGrippa |
16 Replies
3873 Views |
August 02, 2023, 04:16:31 pm by Colas LeGrippa |
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Two heater circuits - grounding both?
Started by cfortner |
2 Replies
1878 Views |
August 02, 2023, 09:12:13 am by cfortner |
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Restoring Old Power Transformer
Started by TurboGuitarMelton |
10 Replies
3932 Views |
August 02, 2023, 08:29:50 am by kagliostro |
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5 Replies
2780 Views |
August 01, 2023, 05:41:59 pm by sluckey |
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filament wiring
Started by labb |
3 Replies
2207 Views |
August 01, 2023, 04:48:29 pm by sluckey |
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3 Replies
2329 Views |
August 01, 2023, 02:09:44 pm by kagliostro |
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Super reverb clone
Started by Rockranger |
10 Replies
3399 Views |
August 01, 2023, 02:23:46 am by Rockranger |
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3 Replies
2426 Views |
July 31, 2023, 04:11:04 pm by HotBluePlates |
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