Welcome To the Hoffman Amplifiers Forum
July 25, 2026, 05:37:18 am
Welcome To the Hoffman Amplifiers ForumJuly 25, 2026, 05:37:18 am | ||
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No bias Raw voltage.
Started by TonyM |
5 Replies
5112 Views |
September 15, 2025, 04:55:24 amby Merlin |
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What Is this circuit ???
Started by kagliostro |
3 Replies
4048 Views |
September 15, 2025, 12:58:25 am by kagliostro |
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1953 pro amp 5C5 circuit
Started by centervolume |
9 Replies
7149 Views |
September 14, 2025, 06:52:54 pm by HotBluePlates |
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zener diode voltage drop
Started by tubenit |
4 Replies
3557 Views |
September 14, 2025, 04:01:22 pm by kagliostro |
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Troubleshooting a new build amp
Started by Wardy |
13 Replies
6056 Views |
September 14, 2025, 01:27:45 pm by Wardy |
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Need opinions on the Stout w/Reverb
Started by sjcasas |
45 Replies
16411 Views |
September 13, 2025, 08:45:46 pm by dogburn |
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7 Replies
5046 Views |
September 13, 2025, 01:34:01 pm by Graydigger |
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Deluxe 5E3 tone stack
Started by Lectroid |
15 Replies
7666 Views |
September 13, 2025, 12:29:59 pm by Lectroid |
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Sovtek MG50H
Started by Ampman33 |
4 Replies
4342 Views |
September 13, 2025, 12:01:22 pm by Ampman33 |
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22 Replies
7573 Views |
September 12, 2025, 02:13:18 pm by Trenchard_UK |
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7 Replies
5059 Views |
September 12, 2025, 12:20:54 pm by Bash |
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Switching cap across plate resistor
Started by Sonny ReVerb |
2 Replies
5406 Views |
September 12, 2025, 06:58:43 am by Sonny ReVerb |
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4 Replies
4013 Views |
September 11, 2025, 05:06:09 pm by mxrshiver |
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4 Replies
4144 Views |
September 10, 2025, 06:13:05 am by kagliostro |
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48 Replies
17969 Views |
September 10, 2025, 04:12:11 am by tubeswell |
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4 Replies
3909 Views |
September 09, 2025, 11:36:10 am by wsscott |
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one-tube-reverbers
Started by Bieworm |
2 Replies
4302 Views |
September 09, 2025, 04:57:07 am by tubenit |
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5 Replies
4662 Views |
September 07, 2025, 01:54:48 pm by Lectroid |
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5879 tube data sheet question
Started by tubenit |
5 Replies
5229 Views |
September 06, 2025, 12:31:01 pm by DummyLoad |
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192 Replies
49929 Views |
September 05, 2025, 02:58:10 pm by wsscott |
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Bias Wiggle Tremolo with 7591?
Started by dwinstonwood |
4 Replies
3810 Views |
September 04, 2025, 12:49:55 pm by dwinstonwood |
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Hiwatt DR103 FX loop
Started by SoundCity85 |
37 Replies
23240 Views |
September 03, 2025, 03:43:24 pm by wavley |
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3 Replies
3945 Views |
September 03, 2025, 11:35:42 am by Bieworm |
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25 Replies
9090 Views |
September 02, 2025, 06:20:08 am by Merlin |
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Reverb Tone Shifting with Dwell knob
Started by Lectroid |
14 Replies
6469 Views |
September 01, 2025, 02:48:23 pm by stratomaster |
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Hum in 5E3
Started by FREYES_7 |
11 Replies
5767 Views |
September 01, 2025, 02:33:58 pm by mresistor |
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Pre-Amp Anode Voltage Ibanez Thermion
Started by philschl |
3 Replies
3482 Views |
September 01, 2025, 06:14:17 am by philschl |
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63 Replies
24375 Views |
September 01, 2025, 01:52:26 am by Avraxas |
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What is this, a local NFB ??
Started by kagliostro |
4 Replies
3322 Views |
August 31, 2025, 10:40:26 am by kagliostro |
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18 Replies
6155 Views |
August 30, 2025, 08:26:31 pm by TIMBO |
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Resistor identification
Started by 1Ab |
21 Replies
7522 Views |
August 30, 2025, 01:30:46 pm by 1Ab |
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5 Replies
4051 Views |
August 29, 2025, 10:20:06 pm by stratomaster |
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Cathodyne bias problem
Started by scstill |
2 Replies
3422 Views |
August 28, 2025, 05:04:06 pm by scstill |
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15 Replies
5255 Views |
August 28, 2025, 09:41:21 am by Willabe |
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20 Replies
9531 Views |
August 28, 2025, 03:33:36 am by tubeswell |
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22 Replies
5538 Views |
August 27, 2025, 01:24:10 pm by Platefire |
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HR DeVille number two.
Started by Bluebark |
20 Replies
6010 Views |
August 27, 2025, 09:11:53 am by Bluebark |
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Sound City 120 is in a bad way
Started by Williamblake |
49 Replies
21573 Views |
August 26, 2025, 02:56:11 pm by Williamblake |
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12AZ7 as DC Cathode Follower?
Started by dwinstonwood |
3 Replies
3213 Views |
August 26, 2025, 11:32:16 am by tubeswell |
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Fender Bassman AC568 issue
Started by retrorod |
8 Replies
3838 Views |
August 26, 2025, 05:54:29 am by retrorod |
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Mic Preamp Power Supply Questions
Started by Jonas |
6 Replies
4044 Views |
August 25, 2025, 06:58:50 pm by Jonas |
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33 Replies
20809 Views |
August 25, 2025, 04:42:10 pm by tubeswell |
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Bugera 333XL-212 power amp stage problem
Started by Carlito |
6 Replies
4086 Views |
August 25, 2025, 09:59:29 am by scstill |
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Stand-Alone 5V/3A Filament TX W/CT
Started by dwinstonwood |
4 Replies
3452 Views |
August 22, 2025, 02:04:10 pm by dwinstonwood |
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19 Replies
6544 Views |
August 21, 2025, 06:00:30 pm by wsscott |
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8 Replies
4528 Views |
August 21, 2025, 04:36:49 pm by Merlin |
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So I tried the Hybrid Tube/SS rectifier...
Started by Nathan |
4 Replies
3674 Views |
August 20, 2025, 09:58:43 am by Nathan |
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4 Replies
3430 Views |
August 20, 2025, 05:11:11 am by HotBluePlates |
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Bias high voltage on HR Deville
Started by Bluebark |
8 Replies
3795 Views |
August 19, 2025, 12:14:44 pm by shooter |
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Vvr and bias switching
Started by Mike-p |
6 Replies
3637 Views |
August 18, 2025, 05:48:05 pm by Mike-p |
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