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Hi all,
First post here. A question relating to reverb tank positioning with respect to the output transformer and the filter cap board. This amp build will be a mirror-imaged Twin Reverb, but consisting only of the "Vibrato" channel, and having no vibrato circuit, but only a reverb one. It will be mounted with the tubes, transformers, and filter caps on top in a Marshall style cabinet.
Here's a work-in-progress image of the inside of the chassis, to provide a rough idea of what I'm doing:
I have purchased a type 8 (short) reverb tank, having been advised by Mojo that I can avoid induced hum by mounting the tank more toward the output transformer end of the chassis (less of an AC field down at that end).
My question is this. Which of the two following chassis-top layouts would tend to result in the least hum induced in the reverb circuit, assuming I can get the reverb tank mounted (against the inside of the front cabinet panel) all the way at the right end of the chassis?
My initial design (note that the OT is all the way to the right):
My more recent design, which more closely follows the Fender Twin Reverb chassis layout with the filter cap dog house to the right and outside of the OT:
The first design, it struck me, would keep whatever AC field that surrounds the filter cap board further from the reverb tank, but will cause the OT wires from the output tubes to be longer than they perhaps should be. Obviously, there's a compromise involved here, but I thought I'd ask for opinions on which of the two layouts might work best with a small reverb tank mounted at the right end of the chassis.
Thank you!
First post here. A question relating to reverb tank positioning with respect to the output transformer and the filter cap board. This amp build will be a mirror-imaged Twin Reverb, but consisting only of the "Vibrato" channel, and having no vibrato circuit, but only a reverb one. It will be mounted with the tubes, transformers, and filter caps on top in a Marshall style cabinet.
Here's a work-in-progress image of the inside of the chassis, to provide a rough idea of what I'm doing:
I have purchased a type 8 (short) reverb tank, having been advised by Mojo that I can avoid induced hum by mounting the tank more toward the output transformer end of the chassis (less of an AC field down at that end).
My question is this. Which of the two following chassis-top layouts would tend to result in the least hum induced in the reverb circuit, assuming I can get the reverb tank mounted (against the inside of the front cabinet panel) all the way at the right end of the chassis?
My initial design (note that the OT is all the way to the right):
My more recent design, which more closely follows the Fender Twin Reverb chassis layout with the filter cap dog house to the right and outside of the OT:
The first design, it struck me, would keep whatever AC field that surrounds the filter cap board further from the reverb tank, but will cause the OT wires from the output tubes to be longer than they perhaps should be. Obviously, there's a compromise involved here, but I thought I'd ask for opinions on which of the two layouts might work best with a small reverb tank mounted at the right end of the chassis.
Thank you!
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