Welcome To the Hoffman Amplifiers Forum
March 11, 2026, 11:18:50 am
Welcome To the Hoffman Amplifiers ForumMarch 11, 2026, 11:18:50 am | ||
| Subject / Started by | Replies / Views | Last post  |
||
|---|---|---|---|---|
| 0 Members and 39 Guests are viewing this board. | ||||
|
|
8 Replies
4724 Views |
January 24, 2021, 06:37:20 pmby Mike_J |
|
|
|
|
6 Replies
4078 Views |
January 24, 2021, 11:23:44 am by isaac_teller |
|
|
|
Dropping B+ secondary of 5e3
Started by fpolak |
25 Replies
9027 Views |
January 24, 2021, 09:31:38 am by fpolak |
|
|
|
26 Replies
9412 Views |
January 24, 2021, 12:54:21 am by munkeyboy |
|
|
|
|
Power transformer bolt is stripped.
Started by Mike_J |
22 Replies
9011 Views |
January 23, 2021, 08:49:41 pm by Mike_J |
|
|
|
16 Replies
6262 Views |
January 23, 2021, 08:33:30 pm by acheld |
|
|
|
|
RR Blackvibe schematic error?
Started by mikhett |
4 Replies
3253 Views |
January 22, 2021, 09:54:53 pm by PRR |
|
|
|
more gain ideas
Started by Bieworm |
5 Replies
3859 Views |
January 22, 2021, 02:48:53 pm by Bieworm |
|
|
|
JTM45 Phase Inverter Mods
Started by sgbrewing |
25 Replies
9566 Views |
January 22, 2021, 01:43:49 pm by 2deaf |
|
|
|
POP between two presence circuits.
Started by raza |
12 Replies
4458 Views |
January 22, 2021, 01:25:53 pm by PRR |
|
|
|
Testing a power transformer under load?
Started by eurekaiv |
9 Replies
5145 Views |
January 22, 2021, 08:04:53 am by Pietro |
|
|
|
Valco Supreme
Started by isaac_teller |
3 Replies
3532 Views |
January 21, 2021, 09:23:08 am by isaac_teller |
|
|
|
14 Replies
6424 Views |
January 20, 2021, 11:23:48 pm by glass54 |
|
|
|
|
Voice of music model 136
Started by goldstache |
7 Replies
4275 Views |
January 20, 2021, 07:26:13 pm by goldstache |
|
|
|
Epiphone Electar
Started by LazarusLong |
25 Replies
8070 Views |
January 20, 2021, 01:47:27 pm by bmccowan |
|
|
|
5 Replies
4749 Views |
January 20, 2021, 02:01:06 am by MrsColumbo |
|
|
|
|
Fixed bias 5D3
Started by Leevi |
5 Replies
3488 Views |
January 20, 2021, 12:58:58 am by Leevi |
|
|
|
24 Replies
9234 Views |
January 19, 2021, 12:09:25 pm by sluckey |
|
|
|
|
even MORE AO44 fun
Started by thetragichero |
1 Replies
2556 Views |
January 19, 2021, 11:21:05 am by SILVERGUN |
|
|
|
Power transformer primary taps.
Started by chocopower |
3 Replies
2885 Views |
January 19, 2021, 08:49:18 am by sluckey |
|
|
|
Extend bias range
Started by Bugman3183 |
3 Replies
2861 Views |
January 18, 2021, 03:43:41 pm by glass54 |
|
|
|
Is dog house too tight?
Started by Mike_J |
22 Replies
7361 Views |
January 18, 2021, 02:30:14 pm by Mike_J |
|
|
55 Replies
12812 Views |
January 18, 2021, 01:30:43 pm by pbman1953 |
|
|
|
|
Harvard 5F10 bias pot
Started by Diverted |
7 Replies
4443 Views |
January 18, 2021, 12:44:41 pm by Diverted |
|
|
|
5 Replies
3364 Views |
January 18, 2021, 10:26:28 am by Mike_J |
|
|
|
|
125A6AX OT
Started by Leevi |
1 Replies
2578 Views |
January 18, 2021, 03:33:29 am by thetragichero |
|
|
|
2 Replies
3108 Views |
January 17, 2021, 10:17:09 pm by scstill |
|
|
|
|
Identify resistor value
Started by dude |
4 Replies
2934 Views |
January 17, 2021, 07:57:43 pm by dude |
|
|
|
EL34 drawing current
Started by SoundCity85 |
19 Replies
9441 Views |
January 17, 2021, 07:23:42 pm by HotBluePlates |
|
|
|
2 Replies
2746 Views |
January 17, 2021, 03:25:56 pm by jordan86 |
|
|
|
|
8 Replies
3645 Views |
January 17, 2021, 01:10:17 pm by Mike_J |
|
|
|
|
16 Replies
8469 Views |
January 16, 2021, 02:33:38 pm by Mungo Park |
|
|
|
|
GND problems- 2.3Volts to chasis.
Started by raza |
5 Replies
3199 Views |
January 16, 2021, 02:06:31 pm by raza |
|
|
|
Harvard 5F10 preamp grid resistor size
Started by Diverted |
2 Replies
2532 Views |
January 15, 2021, 04:48:11 pm by sluckey |
|
|
|
Dual gang pot options
Started by jordan86 |
5 Replies
3827 Views |
January 15, 2021, 04:21:24 pm by jordan86 |
|
|
|
Fender VibroChamp '78 B+ voltage low
Started by fpolak |
44 Replies
10538 Views |
January 15, 2021, 03:06:25 pm by drew |
|
|
|
DC heaters
Started by proaudioguy |
3 Replies
2463 Views |
January 15, 2021, 03:04:58 pm by SnickSound |
|
|
|
Measuring amperage draw
Started by pbman1953 |
9 Replies
4287 Views |
January 15, 2021, 01:36:01 pm by sluckey |
|
|
|
9 Replies
4917 Views |
January 15, 2021, 12:06:47 pm by Bieworm |
|
|
|
|
26 Replies
9955 Views |
January 15, 2021, 04:57:12 am by Joel |
|
|
|
|
Artificial heater center tap question
Started by Bieworm |
5 Replies
3358 Views |
January 15, 2021, 03:42:44 am by Latole |
|
|
|
My Hoffman Twin Reverb - Tremolo
Started by proaudioguy |
7 Replies
4303 Views |
January 15, 2021, 02:05:05 am by proaudioguy |
|
|
|
AA864 Musings
Started by dwinstonwood « 1 2 3 » |
138 Replies
35091 Views |
January 14, 2021, 08:40:40 pm by dwinstonwood |
|
|
|
SE OT power requirements + biasing
Started by jordan86 |
3 Replies
3280 Views |
January 14, 2021, 02:53:59 pm by shooter |
|
|
|
Imperial clone OD channel change
Started by Bieworm |
3 Replies
2652 Views |
January 14, 2021, 09:24:35 am by Bieworm |
|
|
|
2 Replies
2541 Views |
January 12, 2021, 07:24:13 pm by sluckey |
|
|
|
|
COS build
Started by Auke Jolman |
16 Replies
5515 Views |
January 12, 2021, 11:28:07 am by Auke Jolman |
|
|
|
Cathode biasing a pair of EL34s
Started by dude |
10 Replies
6300 Views |
January 11, 2021, 07:45:32 pm by dude |
|
|
|
14 Replies
5419 Views |
January 11, 2021, 03:44:21 am by Latole |
|
|
|
|
Rob Robinette RR 763 BUILD WHAT CHASSIS?
Started by mikhett |
1 Replies
2623 Views |
January 10, 2021, 03:33:59 pm by jordan86 |
Normal Topic
Hot Topic (More than 25 replies)
Very Hot Topic (More than 50 replies)
Locked Topic
Sticky Topic
Poll
| Choose a link from the Hoffman Amplifiers parts catalog |
||
|
Mobile Device Catalog Link |
Yard Sale Discontinued |
Misc. Hardware |
| What's New |
Board Building Parts |
Amp trim Handles |
|
Lamps Diodes |
Hoffman Turret Boards |
Channel Switching |
| Resistors |
Fender Eyelet Boards |
Screws/Nuts Washers |
|
Jacks/Plugs Connectors |
Misc Eyelet Boards |
Tools |
| Capacitors |
Custom Boards |
Tubes Valves |
|
Pots Knobs |
Fuses/Cords |
Chassis |
|
Tube Sockets |
Switches |
Wire Cable |