1. What was the plate and grid currents with the 10W drive?
2. Was any output registering as you tried to tune?
It sounds like it is taking off; has it ever worked?
Carl
KM1H
----- Original Message -----
From: "Van K7VS" <wa7fab@cdsnet.net>
To: <amps@contesting.com>
Sent: Saturday, March 22, 2008 5:36 PM
Subject: [Amps] Heath SB1000 issue
> Plate voltage fine, key xmt relay and have about 50 ma. resting current.
> Apply 10 watts drive and the 3-500Z (which looks new!) the plate begins
> turning cherry red. Didn't have another 3-500Z emiac (other than the pair
> unopened with my unbuilt SB-220!) so I tried a known good 4-400A and had
> the
> same result with small amount of drive (+-10 watts or so) and in fact the
> entire 4-400 plate lit up red! About 3200v no load and appox 2900 when
> drive applied. Any thoughts about possible problem? Tnx Van
>
>
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