red58,
those are great shots. I think that the battery charger looks familiar, good ol Canadian tire! We now have our first radio bench photo!
To start with, we have a radio that has all lit up tubes, speaker hooked up and a running vibrator. (It is a good idea not to use a solid state unit for troubleshooting a radio that may have other problems)
It is usually necessary to provide some antenna input. This can be done with a length of maybe 2' of hookup wire, any convenient gauge. Bare about 1/4" and insert the bare portion into center of the antenna socket. If the radio is going to work right off, this should make a difference.
Failing success, the next step is to see if the power supply in the radio is producing DC power. From the circuit diagram, we see that there should be +250 V Dc from pin 8 of the OZ4, to ground. Now to measure this, set your meter on DC, full scale of 300 V Dc or more, clip one lead on the chassis and touch the other meter lead (not your finger!!) to pin 8. Now, when looking at a tube socket from the bottom, you will see a set of pin contacts around in a circle. There is always one space in the circle. The first pin from the space going counter clockwise, is pin 1. The pins are counted off counter clockwise from there.
I will wait to find out what results you have from these two steps.
For a little explanation here, pin 8 on the OZ4 is shown as "K" for the Cathode. This tube is a rectifier, also known as a full wave rectifier. The output of the power transformer presents a sinewave across the "P" pins, 3 and 5. For one half of the cycle, pin 3 goes positive and the cathode emits current across to it. On the other half of the cycle, pin 5 goes positive and current flows from the cathode to pin 5. At no time does current flow in the opposite direction. Because current flows on both halves of the cycle, this is a full wave rectifier circuit. This current is also charging the capacitors 18A and 18B, that are connected off of pin 8.
