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Re: [Amps] Plate coupling capacitor value

To: Amps group <>
Subject: Re: [Amps] Plate coupling capacitor value
From: Bill Turner <>
Date: Sat, 9 Sep 2017 17:08:51 +0000
List-post: <>
------------ ORIGINAL MESSAGE ------------(may be snipped)

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


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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