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On Sat, 09 Sep 2017 16:53:24 +0000, Manfred wrote:
>
>Specially if tubes are used that have a lot of internal and stray
>capacitance, the loaded Q of the PI tank typically has to be rather high
>on 10 meters
REPLY:
There is a better way to tune 10 and 12 meters despite high tube
output and stray capacitance. A small coil in the anode lead will
create an "L" network which reduces the plate impedance on those bands
and permits use of a larger tune capacitor. This technique is
discussed in the amplifiers section of any recent ARRL handbook. I
have used it on all my HF and six meter amps and it works like magic.
Try it, you'll like it!
73, Bill W6WRT
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