Best preamp for Symphonic Line RG4 MK4

Jwm, thanks for explaining. My question still remains. Can a good tube amp like Atmasphere S-60 or MA1 drive a difficult load like Dynaudio or ATC ?

Atmasphere amps like a 6 or high ohm speaker. If your speaker is 4 ohms or dips lower I would not recommend an OTL. They do make an autotransformer, but at that point I would look at a good push pull tube amp.

When it comes to impedance, JWM is correct. He's also correct regarding the Speltz autoformers. Some may argue the point but they definitely defeat all the advantages of OTL. Duh, he's also correct when he recommends "tubes somewhere in the chain." He and I both agree, start with tubes in the linestage.

Pani, ATC claims 8 Ohm and "flat impedance curve" so I don't see a problem. At 85db, the SCM40 isn't all that efficient but I'm guessing the M60 monos would do the job. My MA-1's had so much gain driving my 6 Ohm, 90db speakers, I ended up removing one of the 6SN7's(at Ralph's recommendation) to give me finer adjustment at the lower end of the MP-1's volume control.

Somebody knows where can I find CAT in Europe ? Please tell one dealler, I just looking all over google and I can not find anybody which selling in Europe with 220 voltage, thanks in advance

This may sound like a pain but if you really want a CAT, I'd buy one on Audiogon and have it shipped directly to CAT so Ken can check it out and do a quick/cheap rewire for 220V.

My guess is, if you buy in Europe and pay in Euro's, you'll end up paying a lot more. Also, CATs come up more frequently on the 'Gon so it shouldn't be too difficult to find one.

Also, I wouldn't go any older than a Signature Mk.2. An Ultimate 1 or Ultimate 2 would be even better but any CAT should make you very happy!

Good luck!