[Amps] Input Z for 2xGI7b

[Johnnie Walker]

Thank you very much Peter for your advice.

73/jeff/ac0c


Peter Voelpel wrote:
> The original datasheet says S=23mA/V +/- 3mA/V,
therefore two tubes should
> have an input resistance of 19-25 ohm in grounded
grid
>
> 73
> Peter 
>
> -----Original Message-----
> From: amps-bounces at contesting.com
[mailto:amps-bounces at contesting.com] On
> Behalf Of Johnnie Walker
> Sent: Montag, 26. Januar 2009 03:03
> To: amps at contesting.com
> Subject: [Amps] Input Z for 2xGI7b
>
> Gentlemen,
>
> What's the concensus on the input resistance of a
pair of GI7b? 
>
> For the resistive component, I've seen numbers in
quite a wide range - from
> 30-145 ohms.  That's quite a spread!
>
> I was hoping that the range could be nailed down
more closely for the design
> of the input matching network.  Perhaps someone out
there has been there,
> done that.
>
> Thanks!
>
> 73/jeff/ac0c
>
>
>
>       
>
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