Welcome To the Hoffman Amplifiers Forum
December 08, 2025, 12:20:27 pm
Welcome To the Hoffman Amplifiers ForumDecember 08, 2025, 12:20:27 pm | ||
| Subject / Started by | Replies / Views | Last post  |
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| Bieworm and 64 Guests are viewing this board. | ||||
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More AO44 fun
Started by jojokeo |
4 Replies
2678 Views |
January 25, 2021, 07:13:34 pmby jojokeo |
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Trem-O-Nator Poll and projects
Started by sluckey |
29 Replies
9538 Views |
January 25, 2021, 03:53:14 pm by sluckey |
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1969/70 Vibrochamp high note modulation
Started by Voxbox |
7 Replies
3255 Views |
January 25, 2021, 03:28:41 pm by 66Strat |
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1M Gain pot / voltage divider question
Started by Bieworm |
1 Replies
2034 Views |
January 25, 2021, 11:10:23 am by jordan86 |
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Channel switching 2204?
Started by JustMike |
1 Replies
2099 Views |
January 25, 2021, 06:18:41 am by SnickSound |
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1 Replies
2289 Views |
January 24, 2021, 09:39:03 pm by PRR |
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8 Replies
3703 Views |
January 24, 2021, 06:37:20 pm by Mike_J |
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6 Replies
3114 Views |
January 24, 2021, 11:23:44 am by isaac_teller |
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Dropping B+ secondary of 5e3
Started by fpolak |
25 Replies
7395 Views |
January 24, 2021, 09:31:38 am by fpolak |
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26 Replies
7522 Views |
January 24, 2021, 12:54:21 am by munkeyboy |
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Power transformer bolt is stripped.
Started by Mike_J |
22 Replies
7204 Views |
January 23, 2021, 08:49:41 pm by Mike_J |
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16 Replies
5207 Views |
January 23, 2021, 08:33:30 pm by acheld |
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RR Blackvibe schematic error?
Started by mikhett |
4 Replies
2549 Views |
January 22, 2021, 09:54:53 pm by PRR |
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more gain ideas
Started by Bieworm |
5 Replies
3175 Views |
January 22, 2021, 02:48:53 pm by Bieworm |
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JTM45 Phase Inverter Mods
Started by sgbrewing |
25 Replies
8152 Views |
January 22, 2021, 01:43:49 pm by 2deaf |
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POP between two presence circuits.
Started by raza |
12 Replies
3651 Views |
January 22, 2021, 01:25:53 pm by PRR |
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Testing a power transformer under load?
Started by eurekaiv |
9 Replies
4163 Views |
January 22, 2021, 08:04:53 am by Pietro |
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Valco Supreme
Started by isaac_teller |
3 Replies
2729 Views |
January 21, 2021, 09:23:08 am by isaac_teller |
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14 Replies
5276 Views |
January 20, 2021, 11:23:48 pm by glass54 |
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Voice of music model 136
Started by goldstache |
7 Replies
3488 Views |
January 20, 2021, 07:26:13 pm by goldstache |
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Epiphone Electar
Started by LazarusLong |
25 Replies
6940 Views |
January 20, 2021, 01:47:27 pm by bmccowan |
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5 Replies
3120 Views |
January 20, 2021, 02:01:06 am by MrsColumbo |
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Fixed bias 5D3
Started by Leevi |
5 Replies
2804 Views |
January 20, 2021, 12:58:58 am by Leevi |
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24 Replies
8034 Views |
January 19, 2021, 12:09:25 pm by sluckey |
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even MORE AO44 fun
Started by thetragichero |
1 Replies
1935 Views |
January 19, 2021, 11:21:05 am by SILVERGUN |
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Power transformer primary taps.
Started by chocopower |
3 Replies
2291 Views |
January 19, 2021, 08:49:18 am by sluckey |
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Extend bias range
Started by Bugman3183 |
3 Replies
2223 Views |
January 18, 2021, 03:43:41 pm by glass54 |
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Is dog house too tight?
Started by Mike_J |
22 Replies
6169 Views |
January 18, 2021, 02:30:14 pm by Mike_J |
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55 Replies
10579 Views |
January 18, 2021, 01:30:43 pm by pbman1953 |
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Harvard 5F10 bias pot
Started by Diverted |
7 Replies
3713 Views |
January 18, 2021, 12:44:41 pm by Diverted |
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5 Replies
2751 Views |
January 18, 2021, 10:26:28 am by Mike_J |
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125A6AX OT
Started by Leevi |
1 Replies
1971 Views |
January 18, 2021, 03:33:29 am by thetragichero |
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2 Replies
2569 Views |
January 17, 2021, 10:17:09 pm by scstill |
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Identify resistor value
Started by dude |
4 Replies
2353 Views |
January 17, 2021, 07:57:43 pm by dude |
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EL34 drawing current
Started by SoundCity85 |
19 Replies
8342 Views |
January 17, 2021, 07:23:42 pm by HotBluePlates |
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2 Replies
2251 Views |
January 17, 2021, 03:25:56 pm by jordan86 |
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8 Replies
2933 Views |
January 17, 2021, 01:10:17 pm by Mike_J |
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16 Replies
7692 Views |
January 16, 2021, 02:33:38 pm by Mungo Park |
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GND problems- 2.3Volts to chasis.
Started by raza |
5 Replies
2631 Views |
January 16, 2021, 02:06:31 pm by raza |
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Harvard 5F10 preamp grid resistor size
Started by Diverted |
2 Replies
2023 Views |
January 15, 2021, 04:48:11 pm by sluckey |
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Dual gang pot options
Started by jordan86 |
5 Replies
3236 Views |
January 15, 2021, 04:21:24 pm by jordan86 |
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Fender VibroChamp '78 B+ voltage low
Started by fpolak |
44 Replies
9203 Views |
January 15, 2021, 03:06:25 pm by drew |
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DC heaters
Started by proaudioguy |
3 Replies
1978 Views |
January 15, 2021, 03:04:58 pm by SnickSound |
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Measuring amperage draw
Started by pbman1953 |
9 Replies
3614 Views |
January 15, 2021, 01:36:01 pm by sluckey |
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9 Replies
4145 Views |
January 15, 2021, 12:06:47 pm by Bieworm |
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26 Replies
8756 Views |
January 15, 2021, 04:57:12 am by Joel |
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Artificial heater center tap question
Started by Bieworm |
5 Replies
2873 Views |
January 15, 2021, 03:42:44 am by Latole |
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My Hoffman Twin Reverb - Tremolo
Started by proaudioguy |
7 Replies
3701 Views |
January 15, 2021, 02:05:05 am by proaudioguy |
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AA864 Musings
Started by dwinstonwood « 1 2 3 » |
138 Replies
29458 Views |
January 14, 2021, 08:40:40 pm by dwinstonwood |
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SE OT power requirements + biasing
Started by jordan86 |
3 Replies
2811 Views |
January 14, 2021, 02:53:59 pm by shooter |
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