Quote:
Originally Posted by vortalexfan
I don't know how you could of missed this, but C50 has a lot more to do with the audio output circuit than you think it does, for example the 245V B+ supply is shared in common between the Audio Detector Tube and the Audio Output tube, and both supplies are filtered through C3B which are their common tie point in the 245V B+ supply through R54 and R56 (R54 feeds the 245V B+ supply line to the Detector Tube and R56 feeds the 245V B+ supply to the output tube and both of those resistors are tied to the positive side of C3B which is tied to chassis ground just like it was originally when it was in the old can cap, if you look at my schematic excerpt and my markings explaining where the negative voltages are being measured at and where the common points are in the two "unrelated circuits" you'll see that I'm not nuts in how I'm following this circuit layout and what I mean by the voltages after C50 are negative unless I reverse my leads.
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I'm well aware B+ feeds multiple circuits. Are you saying you are measuring a negative voltage at point TS8-3 where you have circled, or everything to the right of that point including all the audio output voltages? C50 is an audio coupling cap and has absolutely no influence on B+, other than it could be leaky and letting B+ cross over to the volume control. If that cap is bothering you please remove it from the circuit.