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[AMPS] 572B and an old FL2000B

To: <amps@contesting.com>
Subject: [AMPS] 572B and an old FL2000B
From: W8JI@contesting.com (Tom Rauch)
Date: Wed, 22 Aug 2001 15:24:12 -0400

> either of them there.  Didn't you post here a few months ago
> telling us that improper grid grounding was the cause of the
> 3cx1200's(d7 & z7)instability and you had found a method to
> ground it correctly?  What sockets are you using to get the
> tube to oscillate?

No, I didn't.

The best socket is one that grounds the grid pins with zero lead 
length, but the problem is rooted in the internal construction of the 
tube....not the socket. The way you correct it is you neutralize the 
tube, or you use a Z7 with a grid flange instead of pin connections.

Of course you can make things worse with longer-than-needed and 
especially when using thin grid leads...with or without a capacitor 
in series. 
73, Tom W8JI
W8JI@contesting.com 

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