This may be of interest....
http://www.vcnet.com/measures/relay.mtg.html
-Paul, W9AC
----- Original Message -----
From: Steve Ellington <n4lq@iglou.com>
To: <tentec@contesting.com>
Sent: Wednesday, September 29, 1999 8:20 AM
Subject: [TenTec] Hercules Relay Replacement
>
> I'm in the process of replacing the vacuum relay in my Hercules II and
> hope to improve the noise isolation. Here is a description of how it is
> mounted and any suggestions for improvement are appreciated. Removing the
> bottom cover of the amp we find another layer of aluminum to remove which,
> on it's top side, houses the vacuum relay assembly. This relay assembly
> consists of a small vacuum relay about the size of your little finger
> mounted on a small circuit board. The board is about 1" x 2" and has
> mounting holes in each corner. In each mounting hole is a standard, black
> rubber gromet with a bolt/washer through it to hold it to the aluminum
> base. Undert he board is some gray foam rubber. The foam seemed to have
> been glued to the aluminum and was in very poor condition. In fact, the
> foam was just a sticky, crumbled wad. I need to use some Goof-Off to
> remove it.
>
> I've never seen foam rubber deterioate so badly and I suspect it's
> exposure to RF voltage may have encouraged this. After all, the foam was
> stuck directly to the 500 watt output solder joints of the relay and it
> was quite gooey and sticky. Wouldn't this conduct to a degree? Now I
> suppose the foam was a noise or resonance damper but something better
> needs to be used to prevent the relay clanging. Something that won't
> absorb moisture and is not affected by RF is needed. I could even wrap
> this material around the relay assembly if I knew what to use.
>
> Any suggestions?
>
> Steve Ellington N4LQ
> N4LQ@IGLOU.COM
>
>
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