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[Amps] 2x8877 question

Subject: [Amps] 2x8877 question
From: "Stan C." <>
Date: Sun, 28 Mar 2004 10:42:44 -0800 (PST)
List-post: <>
Hello gang.
 I have a amp running two (2) 3CX1500A7 tubes. It was built to use on 75m AM. 
Here is the problem. With it modulation....the grid current is 
about 40-50 mills. When speaking though the grid current peaks to 200+ on voice 
peaks. Using the "load" to bring it down really brings down the output. I have 
ran other amps (Alpha 89,Command 2500E,etc) and have had no problem keeping the 
grid peaks down by advancing the load. But only loosing 100-200 watts output. 
The transmitter is a Johnson Valiant. 
 I am wondering if I increase the bias voltage from the current 8.2 to say 12 
or 16 volts if this will help out. I know I will have to drive it a bit harder 
to get a given output with the higher bias voltage,but that is no big deal.
 Any help from the knowledgeable would be greatly appreciated.
PS....plate voltage is 3900v under load.
Take care,Stan

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