1950s or '60s vintage Zenith TVs, Need some info

[Kevin Kuehn]

Originally Posted by vortalexfan

OK so what I mean by the voltages after C50 are all Negative is that part of the B+ (245V supply) line goes into TS8-4 which is also where one side of C50 goes in at as well as R54 and R56 and C3B tie in at, and at TS8-3 which is where the other side of C50 comes out (and also where the other side of the 245V supply comes out to supply the 5AQ5 tube with its necessary voltages) is where all of the voltages end up measuring negative, as for my B- reference its where the black wire coming from the power switch ties to the chassis and to the "chassis ground" for the old C3 can (which is out of circuit), and using that B- reference point is giving me negative voltage readings on the TS8-3 side of C50/245V supply line unless I reverse my probes (positive red probe to B- reference and the black negative probe to the voltage reference point).

Now I don't know how I can make that any clearer than that but I'm telling you that's what's happening to me with this TV.

Is the bottom side of R54 on your TV connected directly to the left end of R56, or is it connecting to the alternate point Sams shows with the dotted line? If you'll notice there's an X in the B+ line between R56 and R54. That X indicates the B+ point from R56 is disconnected from R54 when the alternate source is used. In any event you're no longer focusing on the audio output issue and the point feeding R54 has no influence on the audio output portion.

[vortalexfan]

Originally Posted by Kevin Kuehn

Is the bottom side of R54 on your TV connected directly to the left end of R56, or is it connecting to the alternate point Sams shows with the dotted line? If you'll notice there's an X in the B+ line between R56 and R54. That X indicates the B+ point from R56 is disconnected from R54 when the alternate source is used. In any event you're no longer focusing on the audio output issue and the point feeding R54 has no influence on the audio output portion.

The top-side of R56 is connected to the bottom side of R54 which is connected across C3B, which is the point where you were saying that there was a "dead short" earlier when I was telling you that the voltage from there was going from 145V to 22V at pins 5 and 6 on the 5AQ5 tube socket, which by the way, that is how the original C3B in the can was hooked up from the factory, unless you're trying to suggest that somehow this TV was miswired from the factory and somehow managed to get past Zenith's stringent QC standards?