>> knowledge of use of more than a pair of them. They have rather high
>> output capacitance, therefore a tad of series C from plates to the
>> tuning cap is a good idea.
>Why? It certainly does not lower system Q. As a matter of fact, it
>raises system Q.
¿Fact? Q = XC-tune/RL. Two tubes doubles I-anode, which cuts RL in
Half. and doubles the pF required for C-tune. However, two tubes doubles
C-anode. Thus, "System" Q remains constant provided that C-tune is set
to a higher value during tune for max P.out with max drive tuneup.
--- Free, unsolicited advice. It has been my experiences that
words/phrases such as:
/ That is a lie.
/ This is a fact.
/ As a matter of fact,
/ I am telling the truth.
/ I would not lie to you.
/ I am not going to lie to you.
/ Mr./Ms. ___ is a liar.
/ Actually ...
/This is the absolute truth.
... are clues.
>It is a popular misconception passed along among VHF operators
>that a small series C between the tube an tank lowers Q. It
>actually does the opposite.
>73, Tom W8JI
- R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures.
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