2. amps-preamps
  3. 189641-177823

Cool running, low powered power amp

My regular amp is a Class A, all tube (KT 88’s) affair that runs very warm. For most of the year, it doesn’t matter. But in the dog days of summer, it can become unpleasant in my smallish listening room, where the AC doesn’t reach as well.

My speakers are Volti Razz, which are something like 97 db efficient. My big tube amp is out in California getting repaired, and at the moment, the Volti are enjoying time spent with a Scott 299A. Those 17 wpc are plenty (and sound way better than a 65 year-old amp with original tubes (or at least, tubes marked "H.H. Scott") should. Volti says it only needs to be 8 watts to do the job.

I was thinking of First Watt, or maybe Pass Labs XA 25. But both of those are also Class A. But maybe all Class A are not alike in terms of generating heat. I am not anti-class D, and have had two Class D amps that sounded good, but I’d be more interested in A/B, or cooler running Class A. I'd like to bring it in under $3000, and I am a big fan of used equipment.

Thanks,

David

 

dtorc
paradisecom
279 posts
 

The Decware is a fantastic choice.  I was just going to suggest it or maybe a Decware Rachel.  Happy listening and be sure to report back on your findings.

atmasphere's avatar
atmasphere
11,625 posts
 

Class A is always going to run warm. There's no such thing as a 'cooler running Class A.' They would only be cooler by being lower power.

There are class D amps that sound every bit as good as the best class A tube amps now so no need to deal with the heat...

yyzsantabarbara
4,538 posts
 

Class A is always going to run warm. 

Companies like KRELL and Westminster Labs say their amps are Class A and they run cool. The KRELL Duo 175XD that I owned ran cool and sounded like other Class A amps (maybe better). That was up to 175 watts of Class A, when needed. I also own a great Class A amp, the CODA #16 so I have a good frame of reference for the KRELL.

Companies like Gryphon say that the iBias based Class A such as the KRELL are not real Class A. You need to waste electricity for true Class A.

The new KRELL KSA i400 is the next version of what I owned. I expect that to also run cool-ish. That amp is 400 watts Class A at 8 and doubles to 800 and again to 1600. I think it is only 400 watts class A at all impedances.

lanx0003
676 posts
 

CODA has a lot of 'fins' and Krell 175xd gets a lot of fans (4) in the back.  Won't you be bothered by them?  

dtorc OP
11 posts
 

Well - the joke's on me! How naive! I ordered my new Decware Triode, and understood there was a waiting list. I figured it would arrive sometime in July, just when I need it. Well, that may be true, but it would have been three July's from now. As the nice person at Decware said, the waiting list is "at least" three years long. 

I know they are a niche company that makes bespoke products that people apparently love. So, I have no problem with their business plan and respect their approach - I just didn't understand it. So, I canceled my order within hours, and now the search goes on.

Since I am intrigued by low power tube amps at the moment, I see that there is an Eastern Electric Mini Max for sale within my budget, and also a Sophia Electric SET Music Baby amp as well. Anyone have experience with either or both of those?

I do understand that all Class A amps  emit heat - that is baked into the design. But it is a matter of having a 100 watt bulb, or a 15 watt bulb burning in a small closet. I think the 15 watt would be more comfortable.

Thanks,

David

More to discover