Re: Need a quick fix for RF on the high gain input,2204

Stephen Cowell wrote:

"Jim" <askme@xxxxxxxxxxxxxxxxx> wrote in message news:13pkg9esagbmma5@xxxxxxxxxxxxxxxxxxxxx

Xtrchessreal wrote:

I was fixing a hole in my amp - figuratively when the rfi came in and
kept my mind from wondering.

Actually now I am obsessed.

Reality: I was putting some silicone on an led in my amp, go here to
view it, because it was loose and makes noise when it vibrates.
Anyway, while doing this i noticed that when passingg my hand near the
high gain wire to V1 it picked up serious radio station interference.
This reminded me that my guitar also has a radio issue when the volume
pot is open, custom shop Fender strat. It any case, what sort of fix
can you think of to help this situation. I can put an inductive
filter in but that means placing it in series with the high gain
input. Can I place a cap in parallel to ground, and what size and
type of cap do i need for this.


Put a .01 microfarad ceramic disk between input ground and immediate chassis ground. This bleeds off RF before it finds its way into the preamp. Yes, I mean the ground, NOT the signal.


Obviously this only works on insulated jacks.
__
Steve

Obviously. But that's ALL JCM 800 series and most of the JMP series.
.

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