|
09-30-2009, 02:11 PM
| #1 |
| Member Join Date: Apr 2008 Location: Croatia
Posts: 42
| 12ay7 instead of 12bh7 and 6cg7 in Magnatone 280
Would subbing 12ay7 (amp. factor 44) instead of 12bh7 (amp. factor 17) and 6cg7 (amp. factor 20) in Magnatone 280 will make the vibrato stronger? I know I have to rewire the heaters, but will there be any adverse effects?
|
|  |
| ...and now, a word from our sponsor: |
| |
|
09-30-2009, 09:17 PM
| #2 | |
| Senior Member Join Date: Jul 2008 Location: Auckland
Posts: 128
| Quote:
The filaments pins are the same as 12AU...T7 range of valves. The only Magnetone diagram I could find is attached and uses half a 12AX7 for the vibrato oscillator. I have used a 12BH7 as an output valve in a Firefly type grounded grid push/pull with great results! | |
|
| |
|
10-04-2009, 09:41 AM
| #3 |
| Member Join Date: Apr 2008 Location: Croatia
Posts: 42
|
Thanks for reply, I found that 12ay7 does not work in this position.
|
|
| |
|
10-06-2009, 11:47 AM
| #4 |
| Member Join Date: Apr 2008 Location: Croatia
Posts: 42
|
Here are two quick and dirty clips of my 260 and 280 amps: 260: 280: the vibrato on 280 amp is only about half as strong: |
|
| |
 |
| 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 |
| 12bh7 Carmen Ghia | murraym3 | Mods & Tweeks | 5 | 10-22-2009 11:21 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 |
| 12at7 vrs 12ay7 | macdillard | Tweed Builders | 2 | 11-16-2007 04:54 PM |
| Looking for 12ay7/6072 recommendations. | dadydg | Tubes (Valves) | 9 | 06-27-2007 10:20 AM |
Linear Mode
