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[AMPS] Tuning of amps - 3cx800s,etc..

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Subject: [AMPS] Tuning of amps - 3cx800s,etc..
From: (km1h @
Date: Sun, 15 Mar 1998 18:07:44 EST
On Sun, 15 Mar 98 12:35:50 -0800 Rich Measures <> writes:

>- Eimac publishes no maximum grid-current rating for high Mu triodes, 
>recommends  specific grid currents. 

The 3CX800A7 Eimac sheet recommends as "typical" 36ma  CW  and 16ma two
tone grid currents at an Ep of 2200VDC. 
Similar recommendations exist for numerous triodes; 3-500Z, 3-1000Z, etc.

Maximum currents are not specified in the sheets but I have a copy of an
Eimac letter to Amp Supply stating that 50ma is the absolute limit for
the 3CX800A7.  I would suggest that other manufacturers have asked
similar questions...if only to include it in the manual.

I made particularly sure to have those specs included during the rewrite
of the LK-800A manual and also the short lived LK-780 (two 3CX800A7's)
and LK-750 ( one tube). 

73  Carl  KM1H

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