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In Reply to: RE: Yes, even Pass Labs Class A get hot.... posted by AbeCollins on April 11, 2017 at 09:27:16
Obviously, Class A creates more heat by design, but how the heat is dissipated makes a difference. My X250 was A/B but it was never hot to the touch even with heavy use. It was well ventilated as well, which makes a difference in how hot the chassis may seem.
I hope there's more than beauty involved in all that Pass metal, LOL
I understand what you are saying....
But "hot to the touch" is not the issue. It's the total amount of heat dissipated by the amp. And Class A amps put out a lot of heat for the small amount of audio power they produce.
An amp that is dissipating 250watts in heat across large massive heat sinks may not feel "hot to the touch" in any particular spot but it is still dissipating 250watts.
That same amp design with a much smaller heat sink will feel hotter "to the touch" but that doesn't mean it's putting out more heat. It's still 250watts in this example.
I agree the watts are generating heat, but I'm thinking if the heat is neutralized, if you will,at the heat sycns, then less effect of room temperature.
No matter how we slice it Class A is not efficient and that energy has to be dissipated. I was just thinking an amp that didn't radiate the heat into the room may be more of an advantage if you lived in an area with a hot summer. Which is almost everywhere now, LOL
Nirvana Electronic Works (N.E.W) A-20 - a nice little amp you can sometimes find at reasonable prices.
Original Monarchy SM-70 - the ORIGINAL SM-70 is biased pretty far into class A, runs in class A down to maybe 2~3 ohms load. Gives you about 25 watts a channel @ 8 ohms. (Don't confuse the "SM-70 Pro" models for class A, they are high-bias class A/B, not class A. I've owned both. The "original" SM-70 sounds better IMHO.) A pair of them, each driven with balanced input in mono, makes a really great amplifier of about 100 watts a side for under $1,000. Because they have no global feedback, their harmonic output is rich in second-order and low in higher-order harmonics, giving these amps a somewhat tube-like character.
Forte 4a, 50 watts @ 8 ohms, 100 watts @ 4 ohms, class- A. With the Soderburg mods, these amps sound WONDERFUL.
I own all the above and can vouch for their sound and reliability.
I do not own but have read that the Pioneer M-22 amplifier- 22 watts / channel @ 8 ohms, class A- is a very good amplifier.
ANd then there are a number of current and vintage Luxman class-A products which have their following.
I have owned some vintage Yamaha "silver" integrated amps which can be switched into low-power class-A mode. I was not terribly impressed with these.
I know tubes run hot,but I would look at the Atmasphere s-30 OTL.Single driver with relatively stable 6-8 ohm load.Might be heaven.
I have never tried an Atmasphere in my system but have heard them elsewhere and they sound very good. I've always wanted one.
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