Hello gentlemen,

Try as I have to clean this pot, it is shot. The radio works fine now. The volume control is erratic. Good sound from the speaker at what ever the volume control decides to set itself at, you guy's know what I am saying.

The volume control has a center tap and the on off switch has four connections? One for AC power and one for DC power?

I need to replace this volume control, I will never use the radio with battery power, AC only!

Best options are appreciated from the Forum.

Thank you,

Mitch

S-2 is the AC/DC selector switch. You can leave the DC side of the on-off switch open.

You may not be able to find a 2 Megohm pot tapped at 200K ohms. If not, use a standard 3-pin pot and disconnect the capacitor which would have gone to the tap. The tap is for loudness compensation and, while the set will operate slightly differently without it, it won't really be noticeable.

I've made tapped pots using conductive paint (sold in auto parts stores for repair of damaged rear window defroster grids) but this is a tedious process and, in my opinion, not worth the effort.

:You may not be able to find a 2 Megohm pot tapped at 200K ohms. If not, use a standard 3-pin pot and disconnect the capacitor which would have gone to the tap. The tap is for loudness compensation and, while the set will operate slightly differently without it, it won't really be noticeable.
:
:I've made tapped pots using conductive paint (sold in auto parts stores for repair of damaged rear window defroster grids) but this is a tedious process and, in my opinion, not worth the effort.
:
Thank you gentlemen,

I replaced the Pot with a 1 Meg. Works fine now, volume comes up much quicker as expected. Many wires to solder, again to be expected.

Now an old trick would be to install an electrolytic capacitor in the output circuit to increase the bass.

But where?

Warren taught me this years ago, but I cannot remember where to place the capacitor or the value, any re- commendations?

Mitch

Increasing the audio coupling cap (part 22-15) from 0.01 uF to 0.05 uF should improve the bass response. If that isn't enough for your taste, increasing the high cut capacitor (part 22-5) from 0.002 uF to 0.005 uF will reduce high frequency response and eliminate "shrillness". I'm guessing that the speaker in this set is pretty small (5 inches) so bass response improvement is going to be limited by that.

You may be thinking about a cathode bypass capacitor. This radio however uses direct heated cathodes. Can't use an electrolitic there. Farm radios don't have much in the way of audio output power to save battery life.