Rich,
My data sheet shows 25 watts which works out to be a grid current of around
380mA. This seems too high. I fear that it may not be that simple (mixing
AC and DC characteristics) although my tube theory is fluffy at the best of
times.
Popular opinion from all who have responded to me (and thanks to you all) is
a maximum of between 80 and 100mA.
Regards,
David Smith
VK3HZ
----- Original Message -----
From: "Richard" <2@mail.vcnet.com>
To: "David Smith" <vk3hz@wia.org.au>; " AMPS" <amps@contesting.com>
Sent: Tuesday, June 18, 2002 11:57 AM
Subject: Re: [Amps] 8877 Max Grid Current
>
>
> >I'm currently building a 2m 8877 linear amp, based on the K1AGB design.
> >
> >For my metering/protection cicuit, I need to know the maximum safe grid
> >current that an 8877 can handle. It's not specified in the Eimac data
> >sheet. Can anyone help me with this?
>
> There were two, published ratings for 8877 max grid dissipation, 20w and
> 25w. Since the typical grid-cathode driving V is c. 65Vrms, the
> corresponding grid current can be calculated from ohm's law.
> >
> cheers, David.
>
> - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
> www.vcnet.com/measures.
> end
>
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