Tube questions

Tue May 21 03:14:15 EDT 2002

Hello for everyone!

Does anyone knows which is the aproximately input inpedance for single and double 813 tubes in grounded grid circuits.
I am designing input circuit matching unit  for the amplifier with those tubes and like to know that,can anyone help me? 
The plate (anode)tension will be abt 2000-2500V

73 de Aatos OH8JEP

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