[CGMix]

After sending a 1V, 1K tone of not the compressor, my voltage jumps to a little over 7V instead of 3-4V. This does affect the rest of the calibration. Where should I look? All other voltages look to be where they should. 

[JPK]

Check that you have not reversed transformer T1. The label must be facing the back of the module.
What are the AC levels on TP3 and TP4, relative to 0V (1.75V)?

[CGMix]

JP! Thanks for the reply. At TP3/4 I’m getting 3.9vac. On my other working compressor it sits at 1.8, I believe. I pulled the transformer last night, thinking I may have pierced R1, but I had not. Also, I’ll have to check again, but I think I was measuring about half a volt on each grid of the tube. And then it jumps up to about the 4V pretty quickly thereafter. I believe the Transformers is correct because it’s installed in the same manner as my other

[CGMix]

for reference

[JPK]

Is the label on the transformer facing towards the back of the module?
Check the input transformer coils resistance (in circuit with potentiometer IN on 10):
pin2-pin4 : 37ohms
pin3-pin5 : 37ohms
pin7-pin9 : 98ohms
pin8-pin10: 98ohms
pin7-pin10: 194ohms

[CGMix]

Well damn, that was it. Transformer was upside down…

[JPK]

[CGMix]

I wanted to jump back on this thread real quick and ask about another jump. This same unit will jump up in input after using it for several minutes. The meter will peg right and distort. So when it does this I can turn the input and output all the way down and still faintly hear it. But then last night I used it for a couple of hours and it never had an issue. 🤷🏼 I swapped slots on the rack to double check as well

[CGMix]

Here is a shot

[JPK]

I am not sure I understand well.
Do you have a sudden excess of input gain? Does it looks like a bad contact? How does it ends? Please explain more.

[CGMix]

So in that photo I have a vocal running through and if you look at the knobs, all of them are down. But the signal is still getting slammed. I can faintly hear the source even with the output down. The signal is distorted as well. But again, this is not a constant issue. Sometimes it slams the signal, and sometimes it operates normally.