Troubles with an old car radio.

[madmike17]

The 307 volts was positive in relation to ground. It was measured with the .1mfd cap connected to the secondary center tap and nothing else. I did replace the electrolytic that died. I didn't think to check the actual voltage on the tuning cap, but I'm pretty sure it was sparking. I actually found that the rotor was rubbing, so I bent one of the plates over a little. I made a mistake in typing, the rotor is actually connected to ground not the stator. When I disconnected the hv circuit again at said point, I got 267 vdc. This may have been due to the tubes being in and drawing heater current, while last time they were not. Once again I had to tap on the vibrator to get it started.