[Amps] Using 813 tubes on 17 meters and above...

[Bill Turner]

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On Sat, 2 Dec 2017 10:12:45 -0500, Peter wrote:

>Any advice?  

REPLY:

The problem of excess tube capacitance is discussed in any recent ARRL
handbook in the amplifiers section. A simple coil in the anode lead
will create an"L" network which reduces the impedance down to a
reasonable level which can be tuned with a reasonable sized tune
capacitor. I have used this technique several times bandit works like
a charm. 

The neat thing about this is that the coil is effective only on the
higher frequencies and "disappears" on the lower bands. 

73, Bill W6WRT