Usually relay contacts that became gummed up from constant low current use
and insufficient wiping action. Open frame can be cleaned
The Vacuum relay optin can usually be restored by rewiring and putting low
power thru the NC contacts a few times by toggling the relay.
My 1986 500ZC has the original vacuum relay and Eimac tubes.
Carl
----- Original Message -----
From: "john shea" <w3khg@triad.rr.com>
To: <amps@contesting.com>
Sent: Saturday, January 20, 2018 10:53 AM
Subject: [Amps] Attenuation of signal
The Amp International LK500-ZC which I picked up couple weeks ago has
another issue besides the fan. Running an FT-1000mp with it. When I tune
in
a cw signal that is S7 and then put the amp online in standby the received
signal will drop two S units, S5. What could cause this or areas to check.
73
john
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