04-09-2021, 06:58 PM
I took a look at your resistance readings and the one where the CT reads 0 ohms to chassis is bad. I would seriously look for a miswire or a short on that wire where it comes out of the transformer.
Do not, I repeat, do not apply power to this radio until the wiring issues are found using an ohm meter. 500 volts across the filter cap has likely destroyed it. Voltage this high means no load which means either a wiring mistake, or bad or unplugged speaker not supplying power to the rest of the set.
At this point all of the filter caps are probably toast. Bulging and shorted caps can damage the power transformer.
If you really want to work on this radio, I suggest printing out a few copies of the schematic in 11X17 and getting a few different colored highlighters. You can trace out different parts of the circuits using different colors. Schematics can be daunting when first looking at them, but if you break them down, not so bad.
I highly recommend watching videos from YouTube member Joernone. He starts on a radio a does a step by step video from start to finish. You will learn a lot from him. He shows how to trace everything on the schematic as well.
Philco 630B restoration video
Hope this helps you out. All is not lost, sometimes you have to step back and go over the basics.
Do not, I repeat, do not apply power to this radio until the wiring issues are found using an ohm meter. 500 volts across the filter cap has likely destroyed it. Voltage this high means no load which means either a wiring mistake, or bad or unplugged speaker not supplying power to the rest of the set.
At this point all of the filter caps are probably toast. Bulging and shorted caps can damage the power transformer.
If you really want to work on this radio, I suggest printing out a few copies of the schematic in 11X17 and getting a few different colored highlighters. You can trace out different parts of the circuits using different colors. Schematics can be daunting when first looking at them, but if you break them down, not so bad.
I highly recommend watching videos from YouTube member Joernone. He starts on a radio a does a step by step video from start to finish. You will learn a lot from him. He shows how to trace everything on the schematic as well.
Philco 630B restoration video
Hope this helps you out. All is not lost, sometimes you have to step back and go over the basics.
Tony
“People may not remember how fast you did a job, but they will remember how well you did it”
