1176 RevA hairball problems

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bcaldiy

New member
Joined
Jun 30, 2014
Messages
2
Hey guys,
I finished the revA bluestripe build, at calibration stage,
I completed the first two calibration steps but could not get the adjustment with the input to drop to a low enough voltage for stage 3 (meter tracking adjustment)… I got sick of trying to complete step 3 and passed audio from my daw and found the thing seemed to work and had a day of testing it out and it sounds good,
so today I decided to try and go back to step one with my calibration and meticulously redo it to try and be able to complete the meter tracking calibration,
Q-bias went fine again, but now the step 2 discrete metering calibration will not work properly, originally when I did it i remember the meter went easily into negative DC with the null adjust and meter adjust pot and I just zeroed in on 0 VDC between TP10 and TP11…
now the null adjust and meter adjust pot won't allow me reach negative voltages between TP10 and TP11, it only achieves 0 VDC with the adjust pot full CCW…
any ideas what might be the issue?
thanks for your time!
cheers
Ben
 

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