[Amps] Amp Supply LK500ZB - strange failure mode

Vic Rosenthal K2VCO k2vco.vic at gmail.com
Fri Oct 3 01:24:25 EDT 2014


I've run into a number of Eimac 3-500Zs that developed filament to grid 
shorts. Often they test OK when cold.

On 10/3/2014 05:16, k0zx Rich wrote:
> Turned out after pulling and swapping the tubes it pretty showed one had
> the problem and the other didn't. Was looking in a different direction.
> I am wondering if there was something else wrong that caused the tube
> failure, though. Put the good one in both sockets, output definitely
> less than half, but there may be a good reason for that which i'm not up
> on yet. Either way, one step further down the path. Will keep the
> rectifier board in mind, maybe that's what's behind the lower output.
> Know a good source for reasonable prices for these things?


-- 
73,
Vic, K2VCO/4X6GP
Rehovot, Israel
http://www.qsl.net/k2vco/


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