2. amps-preamps
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Pure Class A shootout

Hi after doing a lot of research and listening, I think pure class A is still the way to go for me. I'm wondering if you have any opinions on the following amps and how they compare with each other:

1) Gryphon Colliseum (mono or stereo)
2) Gryphon Antileon Signature (mono or stereo)
3) Pass XA 160.5 or XA 200.5
4) Krell Evo 2

They will be powering Rockport Altair's or maybe Rockport Arrakis (still debating that one too).

I see a few dilemmas. For Krell, it seems like the spirit behind their products Dan D'Agostino is no longer with the firm and thus maybe their brand/lineup in the future may be compromised. Also, Krell's preamp reputation is not as good as their amplification. That's similar to Pass as well - great reputation on the amps but not as reputable on the pre-amps. Don't get offended as I'm only talking relative terms (i.e comparing products at very very lofty levels). For Gryphon, their amp and preamps are supposedly top notch, but right now the Euro is extremely strong vs the US$ and I'm thinking I should be picking up something American as it's more of a bargain. Gryphon + Rockport is a "formula" and I know I can't go wrong with it but I'm wondering if there are other options.

So I guess the question is:
1) Have anyone ever compared the best Pure Class A amps? How do they compare with one another? Yes I know they are all good at this level but unfortunately I have only listened to the Gryphons mated with Rockports.
2) Any other options that I should consider? No tubes please as I have no desire to mess with tubes.
3) Should I even compare/consider the older pure class A amps like the ML 33/33H? i.e are the new pure Class A leaps and bounds better than the older reference lines?

Thanks, -Isaac
changster
drjoe
130 posts
 
If I am not mistaken, true class A amps are 25% efficient.
This means that if the amp is 100watts it will be drawing
400 watts off the wall with no signal. This would be with
an 8 ohm load. A lot of amps are true class A at low power,
at higher power many amps switch to class A/B.
True class A amps usually run hotter than the gates of hell.
drjoe
joc3021
101 posts
 
Clayton Audio makes the best class A amps (or any other type) I have ever heard. I've owned two of their models, S-2000 and M-200.
kurt_tank
1,189 posts
 
My friend uses the Rockport Antares, (great speakers, probably the best I've ever heard actually), and he uses the Lamm hybrid M2.2s. These are 220 wpc monoblock amps, with one 6922 tube in each, (so tube rolling is a snap). However, they are not full Class A amplifiers, although they are heavily biased into Class A, (i.e. the first 41 wpc are full Class A, and then from there it goes into Class B). So basically, only the really loud musical passages actually go into Class B.

The Antares are the predesscor to the Altairs, and based upon my friend's system, I doubt you should be going with anything less than 200 wpc, to be honest. And a 200 wpc full class A amp would be a beast. (And I agree with Drjoe, that they would be hotter than hell, as even the M2.2s will warm up the room a few degrees.)

My two cents worth anyway.

Good luck in your search.
peterayer
1,382 posts
 
Changster,
I own the Pass XA100.5 and XP-20 preamp. It's true that Pass built its reputation on it amps, but this new preamp is excellent and is an incredible match with the XA.5 amps. There are some good reviews out there. Don't write off the Pass combo until you hear it. It is also less expensive than the others you mention.
duane
189 posts
 
The Krell shouldn't be in the list with all the other fine amps listed and the Pass has a metalic glare at the top end.

A lot of the others mentioned are quite good.

Add an NRG to the list or the Coda 100.

One of the best sounding amps of all time is Class B. The Essence Jasper. He claimes that it is the switchover distortion that is the problem.
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