I’ve been thinking about downsizing from separates to an integrated amp. I’ve noticed that some companies have both class A and class A/B amps that are both pretty expensive such as Luxman for example. Hegel seems to be well received and they’re not true class A as far as I know.
I was kind of under the impression that class A was better than class A/B due to lower distortion yet again, there are some well reviewed class A/B amps that are as pricey as some class A amps.
To be clear, it’s really not the price I’m concerned about. It’s the fact that some integrated amps $5000 and up are still only Class AB.
How do these higher priced class AB amps sound in comparison to true class A amps?
+ 1 for the Krell 300i, it’s class A up to 90 watts which I would guess you will rarely if ever eclipse. I had the opportunity to demo the Krell, I owned a Coda CSiB, Primaluna Evo 400 integrated and at the same time demo’d the Krell 300xd Duo Amp (not an integrated unit). I landed on buying the 300xd Duo but that was purely because I wanted the flexibility of separates. The Krell XD line is incredible in my opinion, the drive, control is amazing but it has a touch of warmth, tubiness that is amazing as well. The 300i integrated, best integrated I have heard, hands down. Now the Coda, that was a close second but didn’t quite have that last bit of magic, but that is subjective. Luxman, Acuphase, Pass would be great choices as well. If you like a warmer presentation from your amps, less solid state out of your solid state but also like some of the benefits of tubes, you likely won’t find a better match than the Krell XD gear.
If you are aren’t dialed in specifically to the Class A’s sound signature, Hegel and Michi are outstanding SS pres’s. Mac’s should also make the list, some of their integrated will drive just about any separates.
I would ughly, highly recommend Coda as well and if you give them a call, they might Bias an integrated to pump out more Class A if you wanted. Their CSiB integrated is available with 3 different amplification options, higher class A but less overall top end or lower class A with higher overall output in class A/B. Coda might be the best engineered and quality parts brand that slides under the radar. Their equipment will stand against stuff costing many multiples, it isn’t cheap but the value is off the charts.
Ok, as far as my friend’s PBN power amp. I asked him and he couldn’t find out much other than it’s the PBN Olympia Mini ( he thinks). I think he’s a little fried from his days of playing in bands in the 80’s and 90’s. From what I’ve been able to find, it is not a class A amp. It’s class AB. It weighs close to 100lbs.
It did sound good to me but was that because I was convinced it was class A at the time or was it that it has more power than what I’ve been using? IDK.
You folks gave me much more to consider as far as an integrated amps go. I feel now, that I can find one that does not have to be Class A and hopefully will be just as satisfying.
I am presently using the Classe CP-50 pre with the McCormack DNA 0.5 DE. Was trying to keep things cool in the Texas summer.
I may put the tube power amp in soon for a change of pace.
Anyhow, in my original post, I mentioned that I’m looking at moving away from separates and looking to get a nice sounding integrated. The only reason is that I heard a friend’s system where he’s using a PBN power amp (don’t know the model) and he claims it’s class A. I doubt that it’s all class A but I’ve no idea how many watts are class A. I did like the sound though. It seemed more pleasing to my ears. Smooth like going from a well scotch to an 18 yr. single malt. Effortless. And vocals on some recording made the hair on the back of my neck stand up.
That’s why I’m curious as to whether I need to go Class A for that sound or will some Class AB designs fit the bill.
My room is fairly small and I sit fairly close to the speakers.
I listen to mostly Rock and Jazz so yes, I tend to listen loud a lot.
Why do people conflate the heat of an amp to it's "sound signature?" Tube people do it all the time and it seems some class A people do too. Utterly baffling.
Kinda seems like this jumped right into the weeds about amp design without getting some critical bigger-picture info. You’ve got a long list of equipment on your system page so what are you using now, what improvements would you like to achieve (if any), and what sound characteristics are most important to you? That’s really the bottom line more than whether a given amp is Class A or A/B, at least IMHO.
I mostly use my remote as well. Sometimes playing vinyl, I like to lower the volume with the knob when I get up to change or flip a record but I don't think it should be a deal breaker.
I agree that a proper integrated or preamp should have a volume knob. The Krell 300i has buttons instead (not as good as a knob) and it has a great remote. I just use the remote, so it works for me.
The gold note dealer - Rutherford audio - is having a close out sale on their entire line. The PA1175 MK2 sounds good as well as the IS-1000 integrated. Don’t pay the listed price, haggle it down.
That's why I've been questioning the whole Class A thing vs. Class AB. I had noticed integrated amps at close to $10,000 that were Class AB. I thought, once you got into that price range they would surly be pure Class A.
I found out that that's not the case and that there are obviously very rich sounding class AB out there to consider.
I once owned a Krell KSA Pre w/phono. It was a great pre and one piece of equipment I wish I never parted with.
The K300i sounds very intriguing. The only thing that turns me off is the fact that it has no volume knob. That could be something I could get used to.
You might consider a used Krell K300i integrated. The first watts are Class A then the rest are class A/B. I don’t recall the actual cutover, but it’s pretty high. I own one and love it. Smooth, warm (not bloomy), extended highs, and massive controlled bass. I’m very satisfied with mine. Used you can find them for about $5k.
Rather than focus on pure class A, you might want to look at A/B amps that are are biased to deliver more class A wattage before switching to A/B operation. Some vendors publish these numbers, others do not. Coda is one example. If you don’t play your music loud, or have sensitive speakers, you may not need a lot. More important however is how the amp sounds to you and how well it plays with your speakers.
Class A will usually have a warmer sound signature. My Hegel H390 has a somewhat warm yet nicely articulated sound. I like it paired with my Maggie 3.7's. And yes, class A runs much hotter and takes more juice, even when it's not making music.
As several have mentioned, listen and borrow if you can. I've heard two Class D amps that I thought had heart and soul, and would definitely audition if/when I consider combining to an integrated; Gato and Aavik. The Gato is around $5,000 and unfortunately the Aavik is well north of that. I have never heard them in my system, but would like the chance at some point
There are very good class AB integrated amps , Boulder , Gryphons new 333,
accuphase, Luxman , if youwant class A Accuphase,and Luxman make them too
up to 100 watts into 4 hours , but they get pretty warm and suck up a ton on electricity, it’s like holding your foot down 24-7 to the gas petal . I owned a pass labs . What are your speakers ,and their sensitivity ,at what ohms is most important .
I have owned a Pass Labs X250.8 I have only 87 db efficient speakers playing in quite a large room. I play at moderate volumes all kinds of music. I HAVE NEVER seen the amp leave Class A on the meter....just saying...
I doubt there is anything for $5k used for what you want to accomplish. Just because you are planning to downsize doesn't mean that you are ready to downgrade.
As others mentioned, I wouldn't pay much attention to whether it is class A or class AB to begin with. It should sound right with your current and future speakers.
I own the Luxman AXII - love the sound, luxman says it’s 30 watts pure class A, but reviews have measured that it’s 30 watts pure class A and after that A-B up to 90 watts. I don’t know who is right, but it sounds great and has enough power for my Harbeth 30.2s,
It does get hot, though not as bad as tubes. I would say that if you’re looking at new inefficient speakers, you may want more power, although I have not found that to be a problem with the Harbeths.
Are you just looking for the lowest distortion? You cannot determine sound quality by class alone. We build pure class A mono blocks and hybrid power amplifiers. It comes down to design implementation and the quality of parts. If you want a good power amp for the price, try out the BEL power amps. Even the early models have a beautiful sound.
I was kind of under the impression that class A was better than class A/B due to lower distortion yet again, there are some well reviewed class A/B amps that are as pricey as some class A amps.
There are some megabuck Class A amps I would never trade my A/B Luxman integrated for. The theory is that Class A amplifiers have less distortion right at the zero crossing point, but in absolute distortion terms it is not always the case that Class A has less distortion, it just doesn’t suffer from one particular challenge. I find the peculiarities of an amp to be much more important than the class. Also, I can’t really imagine living with a large class A amplifier due to the power waste.
There are even some Class D designs I like a lot more than some famous Class As.
The Sugden class A integrated amps sound wonderful and are reasonably priced for their sound quality, especially when bought preowned. I downsized from LTA separates (a lot more expensive), and in my system I didn’t lose anything, very happy (running the amp into Revival Audio Atalante 3 standmounts, excellent).
Thanks for the advice. I may want to upgrade my speakers sometime and I would like an amp that can drive my future speakers without having to upgrade the amp ... again.
I would caution you on the pure Class A Luxman integrateds (20W & 30W) driving a difficult load/ low sensitivity speaker. They will produce very little bass to the extent that you would think a component is broken. I tried to power a pair of KEF Ref 1Metas with a 590 AXII, those speakers ate the integrated up. Their M10X is a different story though and produced prodigous bass.
I appreciate the replies. I have heard a friend’s Class A PBN amp (not integrated). I liked the sound I heard but yes, it would nice to do a direct comparison..
I don’t know how much power it puts out in Class A and I asked him and he doesn’t know.
It’s a huge, heavy amp with a single meter that I think indicates current not db’s.
He has money and just buys stuff. LOL!
I’m looking to spend no more than $5000 preferably used.
I've got an MSB S-200 integrated amp; their design has, per the manual, "pure class A stage to increase the voltage signal, and class A-B stage with no voltage gain to increase the current supplied.". This amp was in the $10,000 range when it was new (I bought a demo), and it sounds awesome; the only part of my hi-fi system I've had no interest in upgrading over the past 10 years.
If you are near a Pass Labs dealer you could always compare a class A/B directly to Class A. Pass Labs drop out of pure A at their rated output to A/B and keep going producing more power. You would have a chance to see say what an X line can do, what an XA/Int can do in class A then up the power requirements to get everything into A/B.
If they have another high biased A amp available then you have more to directly compare to.
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