Off subject
Garey Barrell
k4oah at MINDSPRING.COM
Sat Dec 7 16:16:46 EST 2002
No-one has mentioned the downside of "lightly loaded" pentode or beam power
stages.
The screen current will increase, even to destruction.
Drake also says to "tune for maximum output", and running at reduced
loading will melt screens in 6JB6's.
The correct way to reduce the power output to increase tube life is to tune
for maximum (or tube specifications if less) and then reduce drive to lower
the output.
73, Garey - K4OAH
Atlanta
At 01:47 PM 12/7/2002, Glen Zook wrote:
>However, the comment that I replied to was that you
>tune ALL of the pre-1975 equipment, not just the
>TS-520, for maximum output which is definitely wrong!
>I did point out that the manuals for some equipment do
>tell you to tune for "maximum smoke", although those
>transmitters are in a very definite minority.
snip >>><<<
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