[AMPS] Grid current question

Thu, 7 Aug 1997 14:05:37 +0000

> From:          Rich Measures <measures@vc.net>
> 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

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