> From: Rich Measures <measures@vc.net>
To: <amps@contesting.com>
> Date: Thu, 7 Aug 97 15:10:38 +0000
> - Why look at the grid current indication?
Probably because in a cathode driven PA the grid is the best
single indicator of proper tuning, and the grid is the easiest
element of the tube to damage by mis-tuning.
> The grid I meter is of no use in tuning the amplifier.
It's amazing anyone would say something like that!
> 80mA of grid current equates to about 6w of grid dissipation.
How did you calculate that?
> The grid is rated at 25w.
No, the maximum grid dissipation is 20 watts.... not 25.
73, Tom W8JI
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|