-----Original Message-----
From: Rich Measures [SMTP:measures@vc.net]
Sent: Saturday, April 10, 1999 2:56 AM
To: 'amps@contesting.com'
Subject: RE: [AMPS] Parasitic suppressors/another question,
>? Adjusting C-tune makes little difference in the anode resonance since
>C-tune is effectively in series with C-anode, which is much smaller.
>
> >[Richard W. Ehrhorn] <<< A sweeping generalization which is not
> >necessarily true. In many cases - such as big tetrodes tuned by vacuum
>>variables - Tune Cmin may be considerably smaller than tube Cout... right?
>
> ? Surely. The 8973 has 160pF of C-anode. At 29.5MHz, C-tune would
probably be around 100pF. However, in a SB-220 the measured anode
resonant freq. changes little between 80m and 10m operation.
But one example does not a universe make.
73, Dick
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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