>
>
>> Bingo. If he had ever experimented with an amplifier that had adjustable
>> filament V. he would know that once RF output reaches normal PEP, there
>> is virtually no further increase in RF output as filament V is increased.
>
>Careing to set the filament voltage to obtain the proper emission, rather
>than only keeping a fixed voltage, should extend the tube life noticeably
>without affecting gain and output power.
>
Set fil. V to the nominal value, tune for max P-out with max drive.
Decrease fil. V until P-out just begins to drop. Increase fil. V c. 2%.
Recheck every 500 or so hours.
cheers, Mauri
ciao
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
end
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|