Welcome To the Hoffman Amplifiers Forum
April 26, 2026, 07:47:33 am
Welcome To the Hoffman Amplifiers ForumApril 26, 2026, 07:47:33 am | ||
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| 0 Members and 14 Guests are viewing this board. | ||||
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JTM45 Phase Inverter Mods
Started by sgbrewing |
25 Replies
10466 Views |
January 22, 2021, 01:43:49 pmby 2deaf |
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POP between two presence circuits.
Started by raza |
12 Replies
4954 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
5782 Views |
January 22, 2021, 08:04:53 am by Pietro |
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Valco Supreme
Started by isaac_teller |
3 Replies
4028 Views |
January 21, 2021, 09:23:08 am by isaac_teller |
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14 Replies
7115 Views |
January 20, 2021, 11:23:48 pm by glass54 |
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Voice of music model 136
Started by goldstache |
7 Replies
4777 Views |
January 20, 2021, 07:26:13 pm by goldstache |
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Epiphone Electar
Started by LazarusLong |
25 Replies
8736 Views |
January 20, 2021, 01:47:27 pm by bmccowan |
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5 Replies
5213 Views |
January 20, 2021, 02:01:06 am by MrsColumbo |
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Fixed bias 5D3
Started by Leevi |
5 Replies
3984 Views |
January 20, 2021, 12:58:58 am by Leevi |
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24 Replies
10030 Views |
January 19, 2021, 12:09:25 pm by sluckey |
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even MORE AO44 fun
Started by thetragichero |
1 Replies
3014 Views |
January 19, 2021, 11:21:05 am by SILVERGUN |
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Power transformer primary taps.
Started by chocopower |
3 Replies
3345 Views |
January 19, 2021, 08:49:18 am by sluckey |
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Extend bias range
Started by Bugman3183 |
3 Replies
3290 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
8148 Views |
January 18, 2021, 02:30:14 pm by Mike_J |
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55 Replies
14246 Views |
January 18, 2021, 01:30:43 pm by pbman1953 |
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Harvard 5F10 bias pot
Started by Diverted |
7 Replies
4970 Views |
January 18, 2021, 12:44:41 pm by Diverted |
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5 Replies
3847 Views |
January 18, 2021, 10:26:28 am by Mike_J |
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125A6AX OT
Started by Leevi |
1 Replies
2984 Views |
January 18, 2021, 03:33:29 am by thetragichero |
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2 Replies
3543 Views |
January 17, 2021, 10:17:09 pm by scstill |
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Identify resistor value
Started by dude |
4 Replies
3346 Views |
January 17, 2021, 07:57:43 pm by dude |
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EL34 drawing current
Started by SoundCity85 |
19 Replies
10107 Views |
January 17, 2021, 07:23:42 pm by HotBluePlates |
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2 Replies
3155 Views |
January 17, 2021, 03:25:56 pm by jordan86 |
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8 Replies
4104 Views |
January 17, 2021, 01:10:17 pm by Mike_J |
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16 Replies
9021 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
3640 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
2929 Views |
January 15, 2021, 04:48:11 pm by sluckey |
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Dual gang pot options
Started by jordan86 |
5 Replies
4320 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
11498 Views |
January 15, 2021, 03:06:25 pm by drew |
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DC heaters
Started by proaudioguy |
3 Replies
2814 Views |
January 15, 2021, 03:04:58 pm by SnickSound |
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Measuring amperage draw
Started by pbman1953 |
9 Replies
4668 Views |
January 15, 2021, 01:36:01 pm by sluckey |
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9 Replies
5425 Views |
January 15, 2021, 12:06:47 pm by Bieworm |
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26 Replies
10764 Views |
January 15, 2021, 04:57:12 am by Joel |
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Artificial heater center tap question
Started by Bieworm |
5 Replies
3693 Views |
January 15, 2021, 03:42:44 am by Latole |
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My Hoffman Twin Reverb - Tremolo
Started by proaudioguy |
7 Replies
4622 Views |
January 15, 2021, 02:05:05 am by proaudioguy |
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AA864 Musings
Started by dwinstonwood « 1 2 3 » |
138 Replies
38006 Views |
January 14, 2021, 08:40:40 pm by dwinstonwood |
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SE OT power requirements + biasing
Started by jordan86 |
3 Replies
3564 Views |
January 14, 2021, 02:53:59 pm by shooter |
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Imperial clone OD channel change
Started by Bieworm |
3 Replies
2873 Views |
January 14, 2021, 09:24:35 am by Bieworm |
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2 Replies
2794 Views |
January 12, 2021, 07:24:13 pm by sluckey |
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COS build
Started by Auke Jolman |
16 Replies
5856 Views |
January 12, 2021, 11:28:07 am by Auke Jolman |
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Cathode biasing a pair of EL34s
Started by dude |
10 Replies
6775 Views |
January 11, 2021, 07:45:32 pm by dude |
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14 Replies
5854 Views |
January 11, 2021, 03:44:21 am by Latole |
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Rob Robinette RR 763 BUILD WHAT CHASSIS?
Started by mikhett |
1 Replies
2899 Views |
January 10, 2021, 03:33:59 pm by jordan86 |
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Hagström 310 - make it more Supro-esque?
Started by Sesh |
11 Replies
5973 Views |
January 10, 2021, 03:23:29 pm by sluckey |
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21 Replies
8049 Views |
January 10, 2021, 02:01:26 pm by Mike_J |
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PPIMV question
Started by dude |
11 Replies
5261 Views |
January 10, 2021, 12:03:15 pm by dude |
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7 Replies
3650 Views |
January 09, 2021, 08:05:28 am by pbman1953 |
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Why did my filter cap go poof?
Started by jewishjay |
29 Replies
8536 Views |
January 08, 2021, 08:40:18 pm by sluckey |
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26 Replies
11668 Views |
January 08, 2021, 05:02:36 pm by AHeck |
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Biasing/hum issue, Fender Bassman AB165
Started by Diverted |
5 Replies
3781 Views |
January 08, 2021, 02:29:41 pm by Diverted |
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Good deal on a Dual Showman?
Started by jordan86 |
23 Replies
7284 Views |
January 08, 2021, 12:27:05 pm by jordan86 |
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