Ampeg R15R hum problem

[Ted]

You got me thinking about the phase of the signal. Obviously it is now phased opposite of what it was. But in relation to the wet signal, it should be in phase, right. The wet signal gets inverted once at V2B, then again at V3A, so as it comes back to the grid of V3B it should be in phase with the dry signal taked from the plate of V2A. Am I overlooking something?

Yes. Its also inverted by V2A.

[Ted]

Although, thinking some more about it, what difference does it make whether the signal is inverted or not? Its being mixed with the wet signal from the reverb tank which is delayed by quite a large and varying amount. I can't see that it the phase of the dry signal makes any significant difference. Or am I missing something?

[hasserl]

I don't know Ted, but it seems to work just fine. My guess is you're right.