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In Reply to: RE: Do all class A amps transition to AB at some point? posted by PaulF70 on October 11, 2016 at 10:08:07:
SO pure class A means the BIAS voltage is 100% ALL THE TIME.
So if it is a say 50 watt amp, the bias is over 50 watts all the time. A 200 watt class A amp would be a 200watts plus on 100% of the time.
A LOT of heat to get rid of!!!
In fact a class A amp is using the most power AT IDLE. And uses less when it is making music.
With a partial class A, the constant voltage is actually about whatever the A rating is, If the A rating is a moderate percent of the total AB rating. the heat sinks will be sized to fit that A idle wattage use. More so than the actual full AB rating of the amp.
On the other hand... ALL preamps ae usually 100% class A. and plenty of them do not run very warm..
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Follow Ups
- The main thing is HEAT. and waste of power.. - Smelly_Socks 20:27:09 10/11/16 (1)
- RE: The main thing is HEAT. and waste of power.. Yes - A.Wayne 21:48:15 10/11/16 (0)
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