[Boatanchors] RECTIFIERS

[Carl]

Were you testing with sufficient voltage to overcome 14 diodes assuming its 
a string of 1N4007's? Those are simply microwave oven assemblies and not 
something Id want to use in a serious PS.

Carl
KM1H


----- Original Message ----- 
From: "Mr Magoo" <magoo at isp.ca>
To: <boatanchors at mailman.qth.net>
Sent: Tuesday, May 11, 2010 7:19 PM
Subject: [Boatanchors] RECTIFIERS


>I recently had occasion to dismantle an HV power supply which, for lack of 
>a better name, I will call "The Widow Maker".  It powered a 3-1000 linear 
>at about 3900V and was DANGEROUSLY constructed.  Anyhow, the diode bridge 
>was composed of a quad of K2AW 14KV units, all of which, in testing, show 
>NO presence of a diode junction.  They are not shorted, they appear to be 
>open.  The transformer and caps are both good.  I can't think of a 
>situation which would cause all four to open up.  The linear did work for 
>the owner (now in a nursing home) at one time.  My impression of K2AW 
>products is that they are of good quality and not prone to failure when 
>operating this far below their rated voltage.
>
> Anyone care to comment on this?
>
> Bill VE3NH
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