On 10 Jun 2005 09:34:49 -0700, "HarryHydro"
wrote:

Hi Sir Tube Man!
I like details on tube stuff! What kind of radio? I have and use
regularly a Johnson Viking Messenger. Yes, those caps stop RF, but 4uF
sounds too big! That would muddy the audio on the audio pin.. .01uF
caps should work fine as long as they're short leaded.
Hydro
*****

More likely to help in AC (60/120 cycle) ground loops causing hum in
receive or transmit low level audio sections.

You are right to keep RF out one would use say 0.01 micrfarad caps.
Even 100 pF caps for stubborn higher frequency harmonics.

james