Matt, your 374A likely has a bad tube. Excessive PA current is sensed from
a cathode resistor and turns off your rig (hopefully before the fuse blows).
Often the tube will exhibit the short after a few seconds of filament operation.
The solution is obvious. Try it with only one tube installed. Then if it
trips off try the other tube.
Good Luck,
Dick
>Return-Path: owner-amps@contesting.com
To: <amps@contesting.com>
>Date: Sun, 9 Mar 1997 22:33:38 -0700 (MST)
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>To: amps@contesting.com
>From: K7BG Matt Trott <aa7bg@3rivers.net>
>Subject: [AMPS] Alpha 374A
>Sender: owner-amps@contesting.com
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>
>The old 374A seems to be acting up a bit. Every time I turn it on it trips
>off. It did stay on one time long enough for the amber meter lights to turn
>to green, but something is definitly haywire. Most of the time it only stays
>on for 10 seconds or less and never gets to the "green light" stage.
>
>The HV is okay and it doesn't appear to be a tube problem. Anyone ever have
>this problem? Bad relay? No blown fuses, but I'm not gonna try to turn it on
>again until I figger out what's going on.
>
>Thanks, Matt--K7BG
>
>P.S. Wouldn't you know I've been hearing Europeans on 160 the last couple of
>nights which is a first for me and I can't put any fire in the wire to work
>them!!
>
>
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