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Question about Class A

So I read all the time how awesome Class A Amps/Integrated's (SS and Tube) are.

I currently have a Vincent SV-500 Hybrid and feel it sounds really good.

But I have this itch now to hear what Class A would sound like and would it be a big difference to my current Vincent.

I wanted to ask what are some good Class A Integrated's that I could look into?

I know Pass Labs always comes up and for good reason but those might be a bit out of my budget.

I would say I can probably go to $3K new or used.

Sugden is another brand that I have researched a lot and the A21 retails for around $2500 and there is a dealer in Socal that carries it, so that one is tempting.

Vincent has the SV-237 MK II but I think that is only Class A for the 1st 10 watts into 8-ohms and I have 4-ohm speakers so I am not sure if that would give me any Class A magic. I am sure it would sound similar to my SV-500 but have more base extension.

Could you all recommend any other one's? I have been researching but haven't come across any (SS or Tube).

Thanks

128x128jay73

Showing 3 responses by yyzsantabarbara

yyzsantabarbara
4,530 posts
 

I have 2 Class A amps. The KRELL K-300i integrated and KRELL Duo 175XD stereo amp.  The K-300i has the first 90 watts Class A. The 175XD has 175 watts Class A. They are not heavy, not hot, nor do they burn electricity at a high rate. Most importantly they sound amazing with very strong bass. 

yyzsantabarbara
4,530 posts
 

@jay73 You can find a used Parasound A21+ for around $2500. Which is what I paid for it. I traded it in for a KRELL 175XD but the A21+ was very good.

[edit] Oops. I did not realize you were referring to the Sudgen . However, have a listen to the Parasound. It is rather good and in the price range you seek. The first 6 watts are Class A.

 

Forget anything about marketing and of course Krell 175 doesn’t have 175 Watt Class A, even most of Pass Labs amps don’t. Normally you will have 20-30W Class A, producing a heat of more than 100-150W for that kind of power. I doubt there is a good cheap Pure Class A out there, because design, materials and heat dissipation will make it heavy and expensive.

Here is the marketing for the KRELL. iBias Technology – Krell (krellhifi.com)

Krell’s iBias Class A technology allows our latest amplifiers to run in full Class A mode to full power while minimizing heat generation. Previous efforts at using a “tracking” bias, while effective, only measured the incoming signal and set bias levels from this information. Our new patent pending iBias technology significantly elevates the effectiveness of previous designs by calculating bias from the output stage. This seemingly small change in topology results in a dramatic improvement in sound quality, especially midrange richness and purity.

Seems pretty clear to me.

 

 

yyzsantabarbara
4,530 posts
 

I also had the LSA Voyager 350 GAN (modded by EVS). It is not a Class A sound. It sounds more like a Benchmark AHB2 with more low-end and can go down to 2 Ohms. I sold the LSA Voyager -> Parasound A21+ -> KRELL 175XD (happy with the KRELL). I kept the Benchmark AHB2.

The KRELL stereo amps are rather ugly and big. The K-300i is not too bad looking.

Here is a review of the Parasound A21+ that mentioned Class A and low volume listening.

Parasound Halo A 21+ Stereo Amplifier Reviewed - HomeTheaterReview

I owned the older Parasound A23 and I was happy to sell it. The A21+ was so much better than the A23. From what I have read the A21 is supposed to be a big step up from the A23. I would imagine the same for A23+ to A21+.

 

 

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