>Sorry, brain slipped out of gear. Meant Series L.
// More tubes in parallel proportionately lowers RL and
proportionately increases the amount of C-Tune needed to achieve the
desired Q of 10 to 15. Thus, using 1, 813 or 6, 813s is essentially the
same game. More tubes simply means Lower RL, More C-tune/C-load, Less
tank L, and More RF circulating current (approx. = Q x I-anode.). This
matter is yet another one of amateur-radio's, brain slipped out of gear,
tired old wives' tales.
>Barry Kirkwood PhD ZL1DD
>Signal Hill Homestay
>66 Cory Road
>Waiheke Island 1240
>----- Original Message -----
>From: Tom Rauch <firstname.lastname@example.org>
>To: Randall DuCharme <email@example.com>; <firstname.lastname@example.org>; Barry
>Sent: Thursday, 20 September, 2001 8:29 PM
>Subject: [AMPS] Series C at tube
>> > 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.
>> 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
>> FAQ on WWW: http://www.contesting.com/FAQ/amps
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>> Problems: firstname.lastname@example.org
>FAQ on WWW: http://www.contesting.com/FAQ/amps
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- R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures.
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