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Subject: [AMPS] 4-1000 IDLING CURRENT
From: (Jon Ogden)
Date: Sun, 29 Mar 98 23:18:46 -0600
>>My Home brew 4-1000 amplifier works great except for on thing.  The power out
>>seems low.  I believe it may have something to do with the low idling 
>>Plate voltage is 4,600 VDC and idling current is about 80 ma.  
>Zero signal anode current - a.k.a. idling current - should be about 20% 
>of max.., or around 150mA.  

Accoring to Eimac specs, the idling current should be 110 mA at 5000 V, 
so I think 150 is too high at 4600.

>>The max plate
>>current I can load it to is 450 - 500 ma.  At 4,200 VDC under load and 450 ma
>>plate current, gets 1,450 watts out with about 130 watts drive.  
>Normal drive power is around 190w with such low anode V.  If you want to 
>make an 8166/4-1000A play well with low drive levels, you need 6 to 7kV 
>on the anode. 

I wouldn't put more than 6 kV on the anode of a 4-1000A.  6 KV is the 
maximum that Eimac specs, or am I missing something here?

What I want to know is if ANYONE is able to get the 2050 W out that Eimac 
claims with a plate voltage of 5 KV, and plate current of 650 mA from 90 
W of driving power?  This is from an official Eimac publication!



Jon Ogden

"A life lived in fear is a life half lived."

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