Panasonic rj 3200 modulation.

[rogodee]

Any mods or any way to turn up the mod in it. The adjustments I found do nothing to it. I cut d 14 and it didn't make a bit of difference. Yes I wired up a power mic, and it still falls flat. Yes I know it has 50 yo caps, but replacing caps in an old radio isn't the end all, be all...

 

[BC Coyote]

In this case, replacing the caps is likely to be the fix. As you said, they are 50 years old which puts them about 20 years past their best before date. Many of those caps will be way out of spec. Recapping the radio or at least the modulation section should fix the issue.

 

[nomadradio]

isn't the end all, be all...

Sometimes it is. Especially when poopy audio is the issue. Just one problem. There's only one way to find out. Change them all and compare before audio to after audio.

Or you could trace through the audio circuits, one capacitor at a time and identify the ESR for each. Replace the ones that check bad, and you'll hear a difference.

Until the next one, er, "retires". Lather, rinse, repeat.

We call that routine Electronic Whack-A-Mole.

Liquid chemistry inside makes an aluminum electrolytic capacitor work. It goes bad eventually. Not if, but when.

73