>
>
>-----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.
>
? The 8973 is one example of a tetrode with high output C.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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