I think there is something made by Antique Sound Labs that uses the 845 tube single ended for about 22 watts per channel. A friend uses one to drive his Silverlines.
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Being there with Plinius 100 mk3. Went with Mesa Baron, and Dynaudio Countour 3.3, and went back to Plinius! Plinius is fantastic amp, especialy in class A operation. What would you like to achieve with changing of the amps? I gained little bit deeper soundstage, and more liquid midrange, bass was good too, but not as good as with Plinius. I would look into better tube pre-amp, before i ditch Plinius. If you want tube sound, try Pass Aleph amps!
I have a pair of Focus 20/20 and use the EAR 534. It is 50 wpc and has rca/balanced inputs and also individual gain controls for each channel. It is a beautiful amp with a chrome front. It is also relatively maintenance free as tube amps go. It can also be mono. I have two of these amps and really only need one to drive these speakers. It retails for $3595 and I would sell you one of them for 1850 shipped.
In my opinion, you are not going to be able to move three 12" (or are they 14", I don't remember) woofers very well with a low powered tube amp. You won't get a whole lot of bass out of them, as they require tons of current. I lived with the Focus since 1990, and have just recently replaced them. I was very close to getting a Manley Stingray for them, until I heard the two together. Thin, but great midrange.
Thanks for your feedback. 1markr makes a good point about the current needed to drive the woofers. I guess I don't understand the practical application of the sensitivity rating. I've never heard the Plinius 102. The Plinius is a great amp, very pristine and good across the whole spectral range(highs to lows) but at times I feel its too analytical and I was hoping a tube amp would romanticize my system a bit. I think the real issue is my fascination with the low powered set and triodes. even though I've never heard them, I feel I'm missing out on something.
Unless you want to be a guinea pig, I think the best advice is for you to poll Legacy Focus users for what amps work best with these speakers. Use a subject line like "Best amp for Legacy Focus loudspeakers?". I think you would probably like the amps I am using, Atma-Sphere M-60's, but the 4 ohm impedance of your loudspeaker requires the use of a product called the ZERO autoformer to achieve good results. Paul Speltz, ZERO designer, would be a good source of information. His email address is listed at the ZERO site. The ZERO's can replace your speaker cabling. Used M-60's and new ZERO's will cost about $2,500-$3,000. Another excellent resources is the Atma-Sphere Owner's Group, obviously a site dedicated to Atma-Sphere products, but they will discuss other brands as well. There are a number of technically savvy users there that will give you good advice.
I have owned the Plinius SA-100 and now the SA-102. I have tried a number of tube amps but have felt the lack of dynamics and impact is too much loss. Please look up my review of the SA-102 here at Audiogon, I use it with a Placette active pre-amp, Sony SCD-1 and Dunlavy IVa speakers and am extremely happy. Major improvement over the SA-100, much more liquid and naturual while keeping the dynamics.
Hi Wellfed, sorry I missed you last time you where in town.
I owned Focus speakers for many years. I agree with the assessment that they need alot of current especially since the impedance drops to 2.7 in the mid-bass. Consider the Spectron Musician amp. It is class D and doesn't sound like traditional solid state but can provide plenty of current. Enjoy listening.
I never liked the SA100 MkIII. Took it home a few times but my tube monos always played better music. Then I heard the SA102. Murdered the tube monos on 75% of the music, with the tube monos only being better on maybe 10% of the music. At that hit rate I now have the SA102 and I can't see myself changing it for a while. The 102 is not an updated SA100 - it is quite a different amp. You have used the word analytical to describe the SA100. I always thought the SA100 mechanical - perhaps we mean the same thing. By comparison the SA102 is very organic. It does not romanticise, but the problem I find with gear that romanticises is that it only really works with a narrow range of music.