[Amps] Driving Z of 572-b's

[carl seyersdahl]

According to my books the driving impedance of the 572B is 215 ohms, so two
of them would be about 107 ohms. that's as close as one can get I guess.
   carl / kz5ca
----- Original Message ----- 
From: <wb8jkr at juno.com>
To: <amps at contesting.com>
Sent: Friday, October 10, 2003 5:34 PM
Subject: [Amps] Driving Z of 572-b's


>
>  I know all the variables etc, but can anyone give me
> the "approximate" cathode driving Z of a pair of 572-B's
> at full input?  I'm thinking (guessing) about 100-120 ohms?
>
> Mark  WB8JKR
>
>
>
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