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cass a amp how hot does yours run?

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freo

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cass a amp how hot does yours run?
« on: 9 Nov 2009, 10:42 am »
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
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avahifi

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Re: cass a amp how hot does yours run?
« Reply #1 on: 9 Nov 2009, 01:32 pm »
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. :o

Not very "green".

Regards,

Frank Van Alstine
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sts9fan

Re: cass a amp how hot does yours run?
« Reply #2 on: 9 Nov 2009, 01:45 pm »
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. 
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Wind Chaser

Re: cass a amp how hot does yours run?
« Reply #3 on: 9 Nov 2009, 01:50 pm »
Quote from: avahifi on  9 Nov 2009, 01:32 pm
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. :o

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

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Re: cass a amp how hot does yours run?
« Reply #4 on: 9 Nov 2009, 03:02 pm »
Quote from: Wind Chaser on  9 Nov 2009, 01:50 pm
Quote from: avahifi on  9 Nov 2009, 01:32 pm
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. :o

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

So your family gathers around the amp in the evening?

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Telstar

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Re: cass a amp how hot does yours run?
« Reply #5 on: 12 Nov 2009, 11:45 am »
Quote from: freo on  9 Nov 2009, 10:42 am
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.
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