[Amps] Grid Current Advice

[Steven Cook]

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?

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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