Tube amp for "difficult" speakers,,,

Yea, the MA-1's are great, but I hate moving a guy into that many tubes if I don't know him better; as in, can he handle the maintenance and pain-in-the-arse resale.

There are some good comments above. Yea, again, the RM-200 is a great amp and no trouble on resale, but what about all of that biasing? A Defy 7 anyone?! :0)

If I was moving a guy from SS to tubes on an amp and he liked Dynaudio (detail, dynamics, fast and relatively hungry), I'd look at a Berning...It will take hold of Acoustat 2+2's. Its reliable as a tank. Tube rolling is cheap if he wants to and there are plenty of guys out there to talk to him about the amp - knowledgable guys to boot. And, its, um, "nuetral" for a tube amp, so someone moving from SS feels comfortable with it. And on resale, if he wants to later, he barely feels it.

Just an idea...

Good recommendation. As you say, ease of ownership is also an issue moving into tubes, and the Berning is about as plug and play as tube amps can be for someone making the move from SS. Not sure you can find a Berning anymore, I suspect it will be scare on the used market.

Asa, FWIW any Atma-Sphere product that gets updated to the latest level gets warranty reactivation. In addition, the warranty is transferable. This helps with the resale value on amps like the MA-1, which don't tend to hang on audiogon all that long.

Acoustat 2+2s are easily driven with a set of M-60s and a set of ZEROs. They are not a power-hungry speaker.

Hey Ralph, didn't mean to talk down the resale marketability of your OTL's. Hyperbole is a bitch, but then again it is a thread, right? On you MA-1's: I agree, nice amps, great amps, actually. And, yes, they always find a good home, in relatively good time, to the right guy. Hey, maybe it was too much pouring through audiomart newsletters (remember that, Crewe, VA?!), or maybe I've been permanently scared by my Jadis Defy 7 resale experience twenty years ago? Could be...

BTW, I had a friend with the MP-1 and I loved it too, almost bought it; one could swim all day in that luxurious phono. And I like that you are still around, like today, proud of your work.

But, like I said, lots of tubes. It's a psychological fact that, when advising on system evolution, that moving a guy from SS straight into a gazillion tubes may not be the most wise thing to do. I've done it with people asking for help and have seen the faces later. A few more interim steps is sometimes advised. Or maybe not. Like I said, I'd have to know O holter personally to make that decision; mine was a context dependent answer in the middle of a probability analysis...

Basically, I see your MA-1's as a product that is fairly sophisticated; not necessarily in operation, but who ends up there. Please take that as a compliment. With that said, I think that guys who think that they may want to move from 600W SS amps and go SET with a 83db load, might need an interim step. Its the context dependent thing again.

On the 2+2's, we will have to agree to disagree. Granted,I have no experience with the M-60's on the Acoustats, and its been a while since I've heard either on their own, but when I say, take a hold, I don't mean it in a quantitative sense, as in, will it drive the speaker. I was thinking more in the sense, does the speaker speak with its best voice. My comrade had his Acoustats with MA1's and then a Berning and I preferred the MA-1's by a mile(the luxurious part...), so I'm all for the MA-1's with just about anything, including a 83db load. Incidentally, he moved to the Berning because of all of the tubes. But, at the end of the day, I think he might still be tube-rolling the inputs on the Berning looking for that harmonic complexity thing. If you say back, no, the M-60's will drive 2+2's no problemo with dynamic authority and no loss of harmonic nuance throughout the spectrum, then I will defer to you there.

I met you once, Ralph. You won't remember; at a couple of CES's when I was reviewing, and then later at a Chi audiophile club meeting. A while ago now, but what I remember is that you stayed around after the meeting and talked to anyone who wanted to pick your brain. That was nice. More of that in audioland.

Mark Bucksath (Asa)

Hi Mark, the trick to driving Accoustats is being able to deal with the load. A friend of mine had them- wicked low impedance- but we ran them with a set of M-60s and a set of our Z-Music autoformers to deal with the load. They sounded fabulous and could play any reasonable volume- we never ran the system out of power. He had an ARC too; it needed the autoformer as well!

These days you get a set of ZEROs (we don't make the Z-Music anymore) and a set of M-60s will do the job. You would need them even if you had MA-1s; Accoustats are a 'difficult' load, and the ZEROs can be looked at as a great problem solver for things like that. IOW a great way to get a tube amp to drive a problem load.

People often ask if there is a degradation, which is a sort of Red Herring; obviously if the amp can't drive the load 'without', and it does it great 'with', then the answer is 'no, it works great!'