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In Reply to: Re: PP amplifier measured data posted by MQracing on September 28, 2004 at 10:30:00:
Hi mike.In class A the load seen by each tube is raa/2 whilst in class B the load seen is raa/4. In class AB the impedance changes at cut off of the second tube.
The reason for raa/2 during class A is that both tubes are actively dirving the load and each delivers half the power. The tubes are effectively driving the load in parallel - one may be anti-phase but so is its half of the transformer load.
HTH
Chris Jennings
Follow Ups:
Nice job. Looks quite comclusive that the laod presented to each tube, or the load applied to each tube is indeed a-a/2.Regardles what could be said about the situation, or why it is happening, it is hard to wonder how it could be mistaken for a-a/4.
thanks for posting the data for inspection,
live long and prosper,
Douglas
!
Beware the man who behaves deceitfully towards others, for there is nothing else to save you from his deceiving you
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