[AMPS] Tetrode Amp articles needed

[W6TG@aol.com]

In a message dated 97-06-05 10:19:50 EDT from W8JI, you write:

<< In the practical world, ALC is actually MORE necessary in a class AB1 
 PA. The slightest grid current will send the PA into distortion 
 quickly with most AB1 grid driven designs.
 
 The correct way to install ALC in an AB1 PA is to sample PEAK RF grid 
 voltage, and activate the ALC as peak positive voltage approaches the 
 quantity of negative bias voltage. 
 
 In other words, if the bias voltage is -50v, ALC should be activated 
 whenever positive RF voltage peaks approach or reach 50 volts. Any 
 ALC sampling grid current will be "too late" to do any good, so the 
 system has to be a peak voltage detector.
  >>

I would use the power output control that is on most all the transceivers
these days to not drive the AB1 amp into grid current. 
Terry - W6TG

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