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Re: [Amps] [Fwd: Re: LK 500 ZA heat]

Subject: Re: [Amps] [Fwd: Re: LK 500 ZA heat]
From: "Tom Rauch" <>
Reply-to: Tom Rauch <>
Date: Wed, 15 Aug 2007 21:19:34 -0400
List-post: <>
> I haven't had my LK500ZC as long as Carl, but I never had 
> a "parasitic"
> problem with mine, either. I had lots of other problems, 
> most of which were
> the result of errors and mishaps on the part of previous 
> owners.

I think the problem is many people don't really understand 
what causes problems, and so they look for one Devine answer 
to all failures. The fashionable answer when someone doesn't 
really know the answer is "parasitics".

A tube arcs momentarily, a very common event with high 
voltage tubes, and it is a parasitic.

A bandswitch fails, a common event with antenna system 
faults, poor wiring, poor switch choice,  or poor tuning 
adjustments.... and it is a parasitic.

A plate choke burns out, common when there is a series 
resonance, and it is a parasitic.

A carbon resistor in a suppressor goes off value, very 
common for carbon comps operated in high temperature 
environments, and it is a parasitic.

What you find is the people who don't really know what the 
problem was blame a parasitic and say "that's common with 
xxx amplifier" while the people who do understand the system 
say "mine never had that problem".

That's why there is always such a disagreement.

73 Tom


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