[AMPS] SB220/SB221

[w8jitom@postoffice.worldnet.att.net]

> Do other 3-500 z amplifiers exhibit the same spitting/arcing symptoms?. I
> believe I read about the same kind of "strange" stuff happening with the
> Kenwood 922 and 922a's. Am I correct?
> 
> Len

Len,

This stuff isn't strange at all. Nearly all amps will arc if driven 
with modest to high drive power when the tank is undercoupled to the 
load.

The tank has all that energy, and it has to do SOMETHING. If it can't 
deliver current it delivers voltage. 

What is "strange" is how many people are gullible enough to swallow 
the "parasitic" story. 

Tube manufacturers know very well that tubes "outgass" during 
operation. It is a normal part of the life-cycle of the tube. As the 
tube outgasses, it can build up enough gas to arc over. The arc 
itself getters the gas.

That's why Eimac and others recommend using a series resistance in 
the anode supply line.

All this common and well documented knowledge is replaced with pure 
BS cooked up by one guy in California who makes money selling people 
mods to cure problems that don't exist. Rather than try to understand 
that failures occur from many separate causes, every single failure 
is lumped into ONE thing...a parasitic.

Pretty silly when you think about it.

73, Tom W8JI

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