[Amps] Amp Supply LK500ZB - strange failure mode

Jim Thomson jim.thom at telus.net
Fri Oct 3 07:09:25 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


##  How old is the  good remaining tube ??    I would just buy a matched pair of new tubes and be done with it. 
Your chances of getting a 50-50  current split on an old eimac 3-500Z  with a mu of 130   vs a new 3-500Z  with a 
mu of 200   will not be very good. 

##  sell the remaining semi good oem tube to someone who has a 1 tube amp.  

Jim  VE7RF


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