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Re: [Amps] Heath SB1000 issue

To: "Van K7VS" <>, <>
Subject: Re: [Amps] Heath SB1000 issue
From: "jeremy-ca" <>
Date: Sat, 22 Mar 2008 20:16:48 -0400
List-post: <">>
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?


----- Original Message ----- 
From: "Van K7VS" <>
To: <>
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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