Phase flip switch issues

[malchicoff]

I built 2 A12s and a J99 a few weeks ago and they have been working great, but the phase flip on one A12 and the J99 started acting weird today. When i flip phase to the right, i get a significant volume boost. More significant on the J99. Has anyone had this issue before? Its strange that its happening to 2 different preamps, but only 2 out of 3, and it was working fine until today. Various cables show the same issue, and it doesn't seem to be a monitoring issue.

Thanks!

[tpryan]

Can you describe the signal path that produces the symptom?

[malchicoff]

ive tried a few things. first was a pearlman tm1 into my preamps into an ensemble line in. Then i swapped the ensemble with an mbox.. same issue. Then I switched from the tm1 mic to a sm7, same issue.

[tpryan]

Try signal generator->preamp->DAW with nothing else connected. What do your meters say?