[Amps] Fwd: Pi-L In-circuit Adjustment Question

[R.Measures]

On Feb 23, 2005, at 4:54 PM, TexasRF at aol.com wrote:

>
> Hi David, it will absolutely be helpful. Heck, the grid dipper test is 
> helpful. We have been arguing over er, discussing, such a small 
> difference in frequency that it is basically a trivial difference.

In my test, as I recall**,  the amplifier was tuned up at 3.8MHz, the 
amplifier was shut down, and the tank resonance was measured at c. 
3.4MHz.

** alzheimer's disclaimer.
>  
> The only gottcha is that the tube and other nuisance reactance 
> (strays) will be added to your plate tuning C value. The net effect is 
> when everything is finally connected, the plate tune C will end up at 
> a lower setting. No matter though, this why there is a knob on it; we 
> just can't always predict the exact total of the extra C contributors. 
> As the frequency is lowered, this naturally becomes less of an issue 
> and when raised, more of an issue.
>  
> 73,
> Gerald K5GW
>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org