[600MRG] coil Q

[Dick Bingham]

Hi Rudy

I do know that a six meter 3-500 tube amplifier that used a shorted
rotatable turn inside the tank coil was unstable resonance-wise as
things heated up during transmissions. I used a 0.25" wide by 1/16th"
thick strip for the shorted turn.

I discarded that ARRL Handbook design and converted my Heathkit
SB-220 amp to 6M. It has been a reliable amp for me.

73 Dick/w7wkr now back at CN98pi



On Thu, May 17, 2018 at 4:53 PM, Rudy Severns <n6lf at epud.net> wrote:

> Jay’s question is a good one.  I’m obsessed with hi-Q antenna loading
> coils but that’s a special case.  I seem to remember seeing coils with
> discs in old gear: low power applications and rx circuits where the
> simplicity is welcome even at the expense of Q.  No doubt all this has been
> thrashed in the professional literature many years ago although I don’t
> remember seeing it.
>
>
>
> 73, Rudy N6LF
>
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