[Amps] Grid Current Advice

[R.Measures]

On Aug 15, 2005, at 8:10 PM, Steven Cook wrote:

> So if you are running AB2 at circa 3,000 volts on the plate, and let's 
> say... 5 volts of zener bias, and 230 ma of grid current -- would be a 
> little over 1 watt of grid dissipation.  (.230 X 5 = 1.15 watts).
>
> Did I do that right?

It's the AC grid to cathode potential, which is c. 80V-rms multiplied 
by 0.23A.
>
> Steve
>
>
>
> ----- Original Message ----- From: "R.Measures" <r at somis.org>
> To: <keith at dutson.net>
> Cc: "Amps" <amps at contesting.com>
> Sent: Monday, August 15, 2005 7:52 PM
> Subject: Re: [Amps] Grid Current Advice
>
>
> There is no max grid-I rating.  The max rated grid dissipation is 20w,
> but several experimenters have found this to be somewhat conservative
> -- probably because the grid is made from Mo, which melts at 2617ºC.
>
> Figuring grid P --- According to "Care and Feeding ... ... ..." ,
> grid-dissipation is approx. the indicated DC grid current multiplied by
> the RMS grid to cathode potential.
>
> cheers, Keith
> .
> On Aug 15, 2005, at 7:22 PM, Keith Dutson wrote:
>
>> What is the maximum recommended grid current for a pair of Eimac 
>> 3-500G
>> tubes?  Thanks.
>>
>> 73, Keith NM5G
>>
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>
> Richard L. Measures, AG6K, 805.386.3734.  www.somis.org
>
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>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org