> Date: Wed, 09 Jan 2008 13:12:41 -0500
> From: Scott McGrath <mcgrath@fas.harvard.edu>
> Subject: Re: [Amps] Tank circuit arcing
>
> The insulating coatings suggested are not going to solve the primary
> issue which is high RF voltages developed in the tank circuit.
>
Why not?
> since you are running out of inductance that suggests that the amp's
> tank is not designed to support 12m operation and since 12M was
> not even allocated when the amp was built any 12M operation is a
> bonus.
>
Actually, the Henry 3K is designed for continuous coverage. In the "10M"
position, it will tune from 24-30 MHz. I'm not running out of inductance
on 12M, as the rotary inductor is set for more inductance on 12M than on
10M.
> The arcing is eventually going to blow expensive components like
> bandswitches, tubes and caps
>
>
What I'm experiencing on 12M is a frying or sizzling sound, not a sharp
sparking sound. Perhaps the word "arcing" wasn't the best term to use to
describe the situation.
Before I try the insulating coatings, I'm going to see if I can slip a
slit piece of teflon tubing over the end of the rotary inductor at the
point where I think this is happening.
73,
John, K9MM
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