12ay7 instead of 12bh7 and 6cg7 in Magnatone 280

[dinkotom]

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?

[unparalleled]

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?

In my experience 12BH7 is better suited as a reverb driver as it has a plate dissipation of 3.5 watts per half.
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!

[dinkotom]

Thanks for reply, I found that 12ay7 does not work in this position.

[dinkotom]

Here are two quick and dirty clips of my 260 and 280 amps:

260:
[ame="http://www.youtube.com/watch?v=mZ0kXIvABXI"]YouTube - Magnatone 260 homebrew[/ame]

280:
the vibrato on 280 amp is only about half as strong:
[ame="http://www.youtube.com/watch?v=ZpwdOvoLstI"]YouTube - Magnatone 280 homebrew[/ame]