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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 19:47:24 EST
On Sun, 15 Mar 98 16:06:04 -0800 Rich Measures <> writes:
>>On Sun, 15 Mar 98 12:35:50 -0800 Rich Measures <> 
>>>- Eimac publishes no maximum grid-current rating for high Mu 
>>>nor recommends  specific grid currents. 
>>The 3CX800A7 Eimac sheet recommends as "typical" 36ma  CW  and 16ma 
>>tone grid currents at an Ep of 2200VDC. 
>>Similar recommendations exist for numerous triodes; 3-500Z, 3-1000Z, 
>"Typical" means neither "maximum" nor "recommended", except possibly 
>within the Conyers city limits.  

Maybe not out in the land of fruits and nuts Rich. I consider typical and
recommended to be synonomous.

>>Maximum currents are not specified in the sheets but I have a copy of 
>>Eimac letter to Amp Supply stating that 50ma is the absolute limit 
>>the 3CX800A7. 
>50mA is not even close to the rated 5w max.  grid dissipation, Carl.  

Except  the max according to the great god Eimac is 4W. Anyway I suspect
they may have had a reason considering the ability of some hams when it
comes to tuning. Something about a little caution saves dollars in

>about e-mailing me the JPEG image of this Eimac letter?   

Via can do. 

Ciao until tmw....Carl  KM1H

>BTW, I need some kaput 3cx800A7s to autopsy.  If anyone has any, I 
>pay the cost of mailing as well any semi-reasonable gratuity.  
>R. L. Measures, 805-386-3734, AG6K   
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