Hallicrafters SX-42

[westend]

Originally Posted by electroking

The pot controls some bias on a tube acting as a DC amplifier, so removing the
meter may not fix the condition that applies excessive voltage to the pot.
I would unsolder the pot and measure the DC voltage available at that
point when powering up the receiver. I guess a capacitor somewhere in that
area is shorted, but the schematic would definitely need to be studied. Good luck.

I did just as you suggested, 250+ vdc.

Originally Posted by jr_tech

"have the Sam's Photofact for the radio"

If you are looking at the Photofact, you may wonder how 250 volts (or so) gets to the end of the 500 ohm pot. The schematic shows the end of the pot connected to pin 4 of the output tubes, but omits the connection of these points to the power supply at the right end of the choke...oops!

jr

I have another schematic so will be using that, from now on. FWIW, took the pot off, powered it up and was able to recieve FM through the headphone jack. There is hope