[Amps] Building or Buying a Tuned Input Network

Roger D Johnson n1rj at adelphia.net
Mon Jan 23 13:07:15 EST 2006


Vic K2VCO wrote:

> Then, when you have designed or stolen the values, build the networks 
> with mica compression trimmers for input capacitors, fixed silver mica 
> capacitors for the outputs, and T68 size toroid cores.  

I would recommend that the input capacitor be fixed as it set the Q
of the circuit. I'd put the trimmer on the output to compensate for
variations in circuit layout and tube input capacitance.

73, Roger

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