[Amps] Amp Supply LK500ZB - strange failure mode

Jim Thomson jim.thom at telus.net
Fri Oct 3 07:26:41 EDT 2014


Date: Thu, 02 Oct 2014 20:20:35 -0600
From: k0zx   Rich <k0zx.co at gmail.com>
To: n8de at thepoint.net, amps at contesting.com
Subject: Re: [Amps] Amp Supply LK500ZB - strange failure mode

Agreed, that is the one thing i did do, is replace the zener, but no 
change. Looks like it is a bad tube, after swapping and pulling, the 
problem follows the one of them. So now for a little market research i 
guess.
Tnx
Rich

##  RF parts is an excellent source  for a pair of matched 3-500Z’s. 
While u are at it... replace the lytics if they are the oem ones. 
The zener can be replaced with 10-12 1N5408s...or 6A10s. 
Add some simple protection, like a 50 ohm glitch R.   And rvs 
connected diodes between chassis  and B- .   An d also across the 
meters. 

Jim   VE7RF


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