Howdeee! I'm working on my Zenith 6-S-223. I'm trying to check the voltages on the power transformer. My paperwork calls out for AC on pins 3 & 5. What kind of AC? 120VAC? 6VAC? It also calls out 322 volts on pins 7 & 8. Here's what I'm seeing - Pin1 is grd. Pin2 no connection. Pin3 400VAC. Pin4 no connection. Pin5 185VAC. Pin6 no connection. Pin7 .5VAC and Pin8 5.3VAC. Nothing else is in the radio, just the transformer. Readings were taken without the 5Y4 tube installed. I've checked the outputs of transformers this way before (no load) and they pretty much match the specs. Do these voltages sound right? Thanks, Johnny

: Howdeee! I'm working on my Zenith 6-S-223. I'm trying to check the voltages on the power transformer. My paperwork calls out for AC on pins 3 & 5. What kind of AC? 120VAC? 6VAC? It also calls out 322 volts on pins 7 & 8. Here's what I'm seeing - Pin1 is grd. Pin2 no connection. Pin3 400VAC. Pin4 no connection. Pin5 185VAC. Pin6 no connection. Pin7 .5VAC and Pin8 5.3VAC. Nothing else is in the radio, just the transformer. Readings were taken without the 5Y4 tube installed. I've checked the outputs of transformers this way before (no load) and they pretty much match the specs. Do these voltages sound right? Thanks, Johnny

P.S. After I clean my pots, in this case the tone pot, is it okay too use a little WD-40 to lube them?
Thanks again! Johnny

Hi,

On pins 3 and 5, those pins are floating so must connect meter leads across those pins to read 5VAC.

As for pins 7 and 8, connect one meter lead to the center tap of the transformer. Should see approx. 322VAC on each of those pins 7, 8.

WD40 has worked fine for me on tone and volume controls.

Richard

:Thanks Richard. Okay that makes sense now. I'm seeing those voltages but not on the pins you call out. Pins 3 & 5 are my plates and I'm seeing 370VAC from center tap to each of those and my 5VAC is across pins 7 & 8, my filament. This is correct isn't it?
Johnny
:
:Hi,
:
:On pins 3 and 5, those pins are floating so must connect meter leads across those pins to read 5VAC.
:
:As for pins 7 and 8, connect one meter lead to the center tap of the transformer. Should see approx. 322VAC on each of those pins 7, 8.
:
:WD40 has worked fine for me on tone and volume controls.
:
:Richard

Those voltages are fine. Once the transformer is under normal load the voltage will decrease from the winding's internal resistance.

Richard

:Those voltages are fine. Once the transformer is under normal load the voltage will decrease from the winding's internal resistance.
:
:Richard
:
:Thanks Richard! I wasn't measuring those voltages correctly and I thought I might have a bad power supply.
Johnny