Transitioning from SS to tube amplification


Except during my early years in this hobby when monaural and vacuum tubes were the only choice, I've always used solid state amps and, mostly, electrostatic and ribbon panels. Recently, I bought a 20+ year old pair of good stand mount monitors (Reference 3A Serie MMC) that sounded very good with my solid state Peachtree pre and power amps so I thought it would be a good time to also try a vacuum tube amp in lieu of the many challenges associated with pairing tubes with my Martin Logan electrostatics speakers.

I started with a borrowed entry level but well reviewed Primary Luna Prologue One integrated amp paired with the Peachtree Audio Nova integrated as the preamp. I chose this combo because of the Peachtree's source input choices as well, of course, to use its remote control.

Because most of my listening is to various genres of solo guitar that's what I used to audition this combo. My first impression was mixed in that the sound seemed, at first, somewhat attenuated as if the strings had been muffled with a piece of cloth having been laid on the fret board. On the other hand, the sound was very pleasing with some of the jagged edges rounded off. Overall, and regardless of which might be argued as sounding most realistic, I'm very satisfied with what I'll call its more relaxed presentation. I like it and will very likely stay with the tubes.

Please don't read this as my support of one technology over another; first, I'm not qualified to make recommendations. Also, I'm 73 years old and have become more sensitive to certain sounds especially from percussive sources, so this becomes a factor in music choices as well as equipment.

Now that I've decided to stay with tubes, what I would like advice on is where to go next. I like this Prima Luna very much but have been advised by several whose advice I've learned to trust, that at 91dB these speakers may not be sensitive enough to get the best from the A3. I suppose what this means is that I need to look into another amp or more efficient speakers.
128x128broadstone
Hi Jim

I would think you would require a 40-60 watt tube amp to achieve what you're looking for. I have a pair of MM Decapo BEs, the latest. While they have a benign impedance curve across the frequency spectrum they DO like power to come alive, at least for the music I listen to including a large dose of orchestral and large scale. You didn't specify your room size which would also come into play as well. The fact that the music sounds a bit attenuated like lean maybe? Well I'm not sure what is causing that impression, maybe the integration of the Prima Luma with the Peachtree?. While I've never listened to a pair of the older MMs I would expect the electrical characteristics of the current model and yours would be very similar.

As a few points of reference for your information going forward, I have 3 tube amplifiers in house and have tried several other both tube and SS amplifiers and several other various pre-amps in my quest to find the magic combination to realize the potential of the speakers. As of right now it is the Quicksilver Silver 88 with Kt 150 tubes and a highly upgraded/modified vintage Conrad Johnson PV9a pre-amp that I gambled on mainly because of it's large power supply and build quality. This has proved a very synergistic pairing, being able to play large scale music in a very convincing and natural manner and yet play at very low levels while retaining the resolution and natural dynamic shifts in the music, the best of both worlds. I would definitely consider the Quicksilver line as well. Reasonably priced, very low distortion, quiet, simple design but importantly they are full and natural sounding in the mid/upper bass area where I find variation among tube amplifiers. In addition they don't exaggerate the upper frequencies which can become fatiguing over long term listening. I'm sure there are others that will work as well but I can confidently recommend the Quicksilver line. The mid-monos are also excellent at 60 watts and I would expect would work quite well for your stated needs plus they are quite reasonably priced. Good Luck!
I own a Prima Luna Premium, bought the premium version because the base version does sound "soft" on plucked strings. The premium and dialog versions use better/faster diodes in the power supply rectifier bridge which makes the sound crisper. As to power, you can beef that up easily with KT-120 and KT-150 tubes, much better gthan KT-88's in a Prima Luna.
Tubegroover, thanks. I'm very early into this tube amplification quest and appreciate all advice especially when it comes to specific types and brands and what to expect from them. From what I've read and heard, I think you're right, The DeCapos and my speakers do have similar specs. I actually haven't found any shortcomings with these yet and haven't even experienced higher volume issues which was what I've been told to watch out for. My room is about 20X26X9 with my listening position about 16' from the speaker plane. I listen primarily to solo guitar, string quartet, light jazz and occasional orchestral music. I listen at fairly moderate volume.

My reference to attenuation of sound relative to what I'm used to, was not a complaint; I actually find it to be less fatiguing and more comfortable listening. To some extent it's also what I'm looking for in future purchases. Coincidentally, Davide, I actually used the plucked string example to explain the characteristic that described the difference between these two technologies to my wife. As an exaggerated example, I asked her to imagine the difference between plucking guitar strings with a plastic or felt pick.

Even though I'm sure I'll continue with tubes I'm not supporting one technology over another. In this case the decision is quite personal; age related hearing issues persuade me in this new direction as some sounds, especially those with percussive origins, cause me significant discomfort.
Some of the most beautifully accurate and tonally right classical guitar reproduction I've ever had from my stereo system was when I had a pair of Atma-Sphere M-60s on loan in the system. Relaxed and gorgeous. They put the great guitarist John Williams in the room.

Atmos-Sphere makes a 30 watt stereo amp that looks great. Havent heard it, but if its close to what the M-60s did, it may be the ticket. Perhaps Ralph can fill us in on the retail price.

http://www.atma-sphere.com/Products/