|
10-04-2009, 09:40 AM
| #1 |
| Member Join Date: Apr 2008 Location: Croatia
Posts: 42
| Voltages in Magnatone 280 vibrato circuit
I's a homebrew amp, sounds good, but I expected somewhat stronger vibrato. Checked the voltages, some are off - instead of 58V on the grids of V7 (12BH7) I measured 24V. On pin 2 of the V6 tube - instead of minus 2V I get minus 0.6V and instead of 3V on pin 8 I have about 1V, that's way off specs. I Tried different cathode (820 and 470 Ohms) and plate (470K, 100K) resistor values on V6 and the voltages changed somewhat but still off specs and no change to vibrato depth. Swapped tubes - no change. Any thoughts how to get closer to specified voltages aprreciated. Thanks, Dinko |
|  |
| ...and now, a word from our sponsor: |
| |
 |
| Bookmarks |
| Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
| Thread Tools | |
| Display Modes | |
| |
Similar Threads | ||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| Any Magnatone vibrato builders? | cgiff | Guitar Amps | 6 | 11-26-2009 04:48 PM |
| 12ay7 instead of 12bh7 and 6cg7 in Magnatone 280 | dinkotom | Mods & Tweeks | 3 | 10-06-2009 11:47 AM |
| Magnatone 280 B built, vibrato questions | dinkotom | Maintenance, Troubleshooting & Repair | 6 | 09-29-2009 12:55 PM |
| PT secondary voltage in Magnatone 280 | dinkotom | Build Your Amp | 0 | 05-12-2009 07:22 AM |
| magnatone chirping with vibrato in use | wardevans | Maintenance, Troubleshooting & Repair | 0 | 01-15-2008 04:24 AM |
Linear Mode
