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[Amps] rocky point effect, barnacle bill

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Subject: [Amps] rocky point effect, barnacle bill
From: (2)
Date: Sat, 24 Aug 2002 15:11:08 -0700
> I truly just don't know but I think I remember seeing a rectangular piece
>in the hv circuit [near the plate choke] that looked kinda like glass. Maybe
>that was it. ?

Rectangular power resistors are ceramic.  They tend to make schrapnel 
when they open.  Wirewound glass-coated resistors are round.  They can 
withstand more joules of overload than similar rectangular ceramic 
resistors.  Glass-coated WW resistors are not as capable as 
energy-discharge resistors but the cost is under 10% as much.  

>     The diode went from a trace on the qsk board to a ground trace. I
>should write these things down. I think it failed open but again I can't
>        From what I remember from the manual, I have the feeling this diode
>is meant to fail under a fault condition.

The diode would not fail if it was rated at 200A-pk and a suitable glitch 
resistor was used to limit fault discharge current to 200A.  This upgrade 
would have added about a dollar to the cost of mfg the amp and reduced 
the chance of gold-sputtering from the grids.  

cheers, Steve.  

-  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,  

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