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[AMPS] 3-500Z chimneys

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Subject: [AMPS] 3-500Z chimneys
From: (Rich Measures)
Date: Mon, 22 Feb 1999 23:53:09 -0800

>I've noticed that one reason for melting solder on the filament pins in
>3-500 tube has been the corrosion of pins and or sockets making a very small
>narrow contact point where all the filament current must be drawn through.
>This heats up the contact to a solder meting point.

I have noticed that such problems are caused by a weak helper-spring on 
contacts #1 and #5 on the 3-500Z tube socket.  The solution is to 
fabricate better helper springs or to use Kenwood 922 tube sockets.  


R. L. Measures, 805-386-3734, AG6K,  

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