Hi Gang, This Farnsworth GP-350 is an AC/Battery portable. No action, so I replaced
the selenium. No +- markings on it, but one post had a red mark. I presumed that+.
Replaced with diode, silver band to +. Still no action. Next in line was a 47 ohm
carbon resistor. Tested open. Installed a 220 ohm temp. replacement. Action!

Blatttt! Loud blatt. Volume control no effect. Can't call it hum. The old filter caps were
in place. I took them out of the circuit, and tacked in a 50 and 30 mfd. (Schematic different
but were same as my original values) Negative leads to original multi-cap case, and
positive as the original. (I should note; the original cap can is insulated from chassis.)
Blattt.

Wonder if I did something wrong? If I know I'm correct so far, I'll continue with recap,
and checking. Link to schematic to follow.

http://www.nostalgiaair.org/resources/972/M0005972.htm

Thank You, terry h

There is a thrid electrolytic, it is a 100 mfd.,50 volt, number 27. Try that one.

terry h,

I'm a bit puzzled: The linked schematic shows your 50 and 30 uF caps, along with the 100 uF mentioned by glasdave.

Note that the schematic symbols for the electrolytics are drawn upside down. The + and - signs are correct.

Watch your filament voltages; too much juice will zap your tubes.

It might be a good plan to get the radio working on batteries first, then tackle the AC operation.

Ted

Thanks Dave and Ted. The 100 Mfd. was hiding in plain sight, with markings down,
among a nest of paper caps. Should have seen it right away. Bent it over the chassis
edge to see what was underneath. Didn't help that I was reading schematic on screen
sideways. Fifteen caps to replace in the 7x3.4 shallow chassis. It has a "cute"
case. I keep telling myself that for motivation.
BTW Ted, I had considered the over voltage filament fry scenario. I replaced the 47
ohm with a 220 ohm with that in mind. Overkill I presume.
Thanks again to you both for the point outs and reminders, terry h