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You can do that. It's not really different from the stock arrangement except you have an extra tube stage in the dry path before mixing, which is kinda putting the cart before the horse. The reason Fender had to use that noisy 3M3 resistor is that the wet signal is very small compared to the dry, so he had to knock the dry signal level down a lot. If you put the extra gain stage in the wet recovery path instead, you can use smaller mix resistors and hence less noise. Some amps even use the two grids of the phase inverter for mixing wet and dry.

 

As CJ said, phase is irrelevant. Sinewave testing is misleading because signals appear coincident when they're actually being delayed.


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