[freo]

Greetings from Australia
I have a first watt f3 clone that runs in class a all the time, it gets very hot 68 degrees c anyone else have a class a that runs about the same
Regards Roger

[avahifi]

A class A amplifier must be biased on at twice full power output into 8 ohms, or four times full power output into 4 ohms.  A 10 watt per channel class A amplifier that remains class A into 4 ohms will put out 40 watts of heat all the time from each channel, 80 watts total.  You might notice how hot a 100 watt light bulb gets.

68 degrees C is probably quite reasonable for a small class A amplifier.  However if you wanted 200 watts per channel class A, your amp would put out as much heat as a big home electric space heater.

Not very "green".

Regards,

Frank Van Alstine

[sts9fan]

My Zen v9 which is pretty much the same as the F3 runs pretty warm but not bad.  I used Conrads biggest sinks I think they are 350mm?  After a few hours on I can still keep my hands on the sink as long as I want. 

[Wind Chaser]

68 degrees C is probably quite reasonable for a small class A amplifier.  However if you wanted 200 watts per channel class A, your amp would put out as much heat as a big home electric space heater.

Such amps in Canada during the winter have a huge WAF.  Green isn't an issue when it's -40.

[turkey]

68 degrees C is probably quite reasonable for a small class A amplifier.  However if you wanted 200 watts per channel class A, your amp would put out as much heat as a big home electric space heater.

Such amps in Canada during the winter have a huge WAF.  Green isn't an issue when it's -40.

So your family gathers around the amp in the evening?

[Telstar]

Greetings from Australia
I have a first watt f3 clone that runs in class a all the time, it gets very hot 68 degrees c anyone else have a class a that runs about the same
Regards Roger

My F3 runs hot too. I'll eventually put it in a bigger case with huge heatsink.