How many watts per channel are enough?

Agree with Liz. You've got a nice sized room. I'd be looking for 50 to 75 tube watts at the very minimum. I think a good rule of thumb with amps is to err on the high side. Of course, I'm not talking about 400 wpc mono-blocks. But in your case, I advise erring on the side of more watts.

Btw, I listen to classical music too. Just listened to Beethoven's 9th. Before that, Prokofiev's Symp #1. The drums rolls are really dynamic. I think a 34 wpc amp will run out of runway real fast trying to keep up.

I use the PL 5 with Opera Platea floorstanders (86 db sensitivity) in a 26' x 15' X 9' room. I use either EL 34 or 6CA7 tubes, which give you a few less wpc than if you use KT88s. I listen to CDs almost exclusively. The front end is a Musical Fidelity CD PRE 24 cd/ preamp.

It comes down to four items to consider:

1. how loud you play your stereo
2. what types of music you listen to
3. how noisy is the street you live on
4. do you live in a private house or an apartment house

I live in NYC (Queens) in an apartment house on a major road which connects to the LIE and supports a major bus route and a fire house.

With all that said, the PL5 will play plenty loud if you listen at low to moderate levels. If you like your music loud, you are probably looking at a solid state amp or a more expensive (and powerful) tube amp.

Rich

I have to disagree with some of the other posters. You should have no problem at all driving your speakers with either of the 2 amps you list. Your speakers are not that difficult a load. Also, you really can't rely on watts as a measure of how powerful the amp is. There is no common standard that equipment makers use for their ratings. They all do it their own way. For example, if you took ten 100 wpc at 8 ohm amps from ten different manufacturers and tested them all the same way, every single amp would put out a different amount of watts.

Zd542, legally they would all be required to put out at least 100 Watts. I agree that 89 dB isn't that inefficient, but 39 Watts is really on the low side for a room of that size.

Your taste in music seems sane, but speaking from experience, only if you (and your friends) drink a lot, you own a disco ball and/or play a lot of beerpong, love to dance all night to Dubstep, and your listening room is in an abandoned shoe factory, 36 watts might be light (in that case simply buy the speakers, subs, and amps from a band or DJ that gave up). A Jolida 502P with "factory upgrades" is about the same cost or less than the Primaluna. I have one (502p) running supposedly 90db speakers (Silverline Preludes...review testing noted perhaps they are less) in a room a bit larger than yours and it has plenty of power to spare, sounds astonishingly good, and includes balanced inputs and "easy biasing" (you could buy 2 wired mono and double your fun for less than the cost of virtually any other decent stereo tube amp)...I do use a REL sub with it but the amp runs full range, and has 85 to 115 watts peak depending on what specs you read. If you "actively listen" to normal music within 12 feet of your speakers, a 65 watt per side amp will give you all the juice you need unless you have hearing issues, really thick hair, or very bad taste in music...Jolidas are very rarely reviewed for some reason which is why I blather about mine. Not sure why I blather about other things, but really...who cares?