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Originally Posted by Geist
..Yes, it is the same Schematic.. I cannot take that Cap apart, again it would destroy it.. But, I can unwire that one from ground and install an external Cap.. All three Caps in that Can are wired with common Negative connection..
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If all three are wired with common negative, that would be correct. AND the common negative should be 'floating' above ground since it is the negative supply rail (or buss). It is floating and not shorted to ground, isn't it? Looks like it should show around 500-600 ohms to ground, with a bit of variation when you turn the focus control.
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I just looked at the Can and it has (as near as I can tell) the negative as the common point.. I also, Just looked at the Sams and It also shows that the + (positive) side of that cap going to Ground..
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Good. Then Sams has it correct.
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On another Cap the (C225) on the Riders, When C225A is connected to Cap C221B, then the voltage goes LOW, about 45 volts at 120 volt input to the transformer, But when C225 is not connected to C221B, the the Voltage is about 230 volts, still slightly low, by 70 Volts, but that could just be my Rectifier, since they are all old Tubes.. So when C225 is connected either what is connected on the other side of it or the other Cap, Is pulling things down.. I have yet to disconnect the rest of the wires from C225 to see IF it has any affect on the Voltage Dropping..
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Have you checked the Horz centering and Vert centering controls? Both should be 20 ohms according to the schematic. An open element in either one could really screw things up since they're both in series in the B+ chain feeding out to the 275V buss.
Um..
You are taking your voltage reading at the 275V source, right?
And another thought.. is the center tap of the power xfmr's HV winding connected to the common-negative 100V buss? In re-reading your thread, you mentioned some strangely low B+ readings coming out of the 5U4s. An unconnected or mis-connected center tap could do this.