05-20-2015, 05:00 PM
Hey Eric
How's things down in Cumming,Ga? Well looks like you got a good handle on the wiring. Yes the red wire is A+. Would bet that A-,B-, and C+ are all tied back to the chassis.
I would check the resistance across the audio transformers to be sure that both pri and sec are good not open. The wire coming from the plate pin of the 71A will need to go though a high impedance spkr or a tube type output transformer to a pm spkr. Blue wire from the transformer ( you don't have yet) goes to the 71A plate lead and the red wire goes to HV. The 71A can take up to 180vdc on the plate. Will work fine of 135 or 90v. Hope I've answer all your question for now.
GL
Terry
How's things down in Cumming,Ga? Well looks like you got a good handle on the wiring. Yes the red wire is A+. Would bet that A-,B-, and C+ are all tied back to the chassis.
I would check the resistance across the audio transformers to be sure that both pri and sec are good not open. The wire coming from the plate pin of the 71A will need to go though a high impedance spkr or a tube type output transformer to a pm spkr. Blue wire from the transformer ( you don't have yet) goes to the 71A plate lead and the red wire goes to HV. The 71A can take up to 180vdc on the plate. Will work fine of 135 or 90v. Hope I've answer all your question for now.
GL
Terry
