Strange two channel tremolo

[fuzz_addict]

Hi folks, I've been tracing through an old amp and haven't been able to make full sense of this tremolo design.
Appears to be some kind of grid leak biased oscillator, similar to ones I've seen on old 50s - 60's American amps. Only trouble here is the separate depth controls for each channel which seem to be reducing the level of the tremolo signal.
I'd like to increase the intensity of the tremolo but haven't had much luck so far, have any of you seen something like this?

8-50 tremolo.png

[sluckey]

Decrease the value of those 82Ks going to the INT pots. I'd just tack another 82K across one of them to see if it gets stronger.

BTW, my Magnatone M10A and M2 amps use a grid leak oscillator.

[TUBEDUDE]

I'd check the tube for gain and the caps for value. If all good, follow Sluckeys advice. That may cause some interaction when channels are adjusted. But once they're set you likely won't readjust during the set.

[Ten Over]

Change the 22uF bypass caps to 5uF.

[fuzz_addict]

Decrease the value of those 82Ks going to the INT pots.

Thanks for the reply sluckey, I always enjoy reading what you have to say over on the hoffman forums.
I'll give that a shot when the amp is up and running.
This amp is actually being rebuilt as it was truly a horror inside when I received it, and in particular the tremolo had a strange ailment.
When one channels depth knob was turned up about a quarter, a continuous hiss/crackle sound would develop. Almost sounded like the noise a failed plate or cathode resistor can make.
However when the second channels depth control was turned up as well, the volume of the noise would decrease and eventually " cancel out" when it reached the same tremolo intensity for each channel. Any idea where that could have been coming from? it completely stumped me. All the usual suspects had been ruled out such as a bad tube etc, I was under the impression it may be some kind of channel interaction due to the way the tremolo works but that doesn't make a whole lot of sense to me either.

[Stevem]

I would also question the amount of signal gain pumping out of V1B and V2B, have you checked and or replaced both of those gain stages cathode bypass caps?