Shielding output caps on Foreplay.

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Hi bottleheads,
Maybe that can be of help to somebody, and will probably not hurt.

Recently I changed the Foreplay output caps to Hovland musicaps. The change resulted in bright sound.
Relax and wait a month for break in (I was told). Better, but still on the harsh side.
I connected a scope to the output, and found a 650 Khz AM local station putting 5mV (very sensitive to body capacitance )on the output. I tried the filament snubber recommended by VoltSecond (nice web site), ferrite bead on grid inputs, grid stoppers, with no luck.
By pure chance I realized that the output was still there with the unit unplugged (?).
Result :with my ground scheme,(star ground), interconnects and amp input impedance, the caps where acting as a very good antenna, so I shielded the caps with aluminum foil (What I had at hand), and grounded the shield.
Noise gone.
No hiss.
Nice sound back.

ItÂ´s free, will keep you busy for a while, and worked on my Foreplay.
If you try and it works, please let us know.
Miguel

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Topic - Shielding output caps on Foreplay. - Miguel 03:16:08 11/03/00 (5)

Re: Shielding output caps on Foreplay. - specopsda 08:32:07 11/06/00 (1)

Re: Shielding output caps on Foreplay. - Miguel 12:19:07 11/06/00 (0)

Re: Shielding output caps on Foreplay. - olen 12:52:46 11/03/00 (0)

Awesome science! You gonna be my idol (nt) - Poindexter 10:59:29 11/03/00 (0)

Neat shielding of output caps on Foreplay! (nt) - VoltSecond 05:39:36 11/03/00 (0)

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