Tubes?

+2 twoleftears,

Lower sensitivity speakers just have to be matched.
 
Second HIGH sensitivity can lead to a high floor noise if your not careful, just depends on what your willing to listen to, and put up with.

A valve preamp, with those 601s will surprise you. There are a LOT of great sounding SS amps.  A LOT. There are a lot of great sounding valve amps, too. Dollar for dollar. GREAT amps on either side can cost a few bucks..

A pure class a  SS 30-60 watt amp will match, any 30-60 watt class a valve amp. WATT for WATT. The difference is when we turn it UP, I mean all the way up...

There is a big difference in distortion, I had Pass, Mark Livingston, Summo, and First Watt. They all preformed quite well with any valve amp I put them against. On the other hand, that was not the case when I reversed it. The valve amps, could not do the job when it came to bass performance. The distortion was through the roof...10-30% at the driver.
I've messed with 450-1200 watt of valve power, VTLs Wotons and SigII 450-750, both.  They did a good job. with a 40,000.00 price tag. AND still couldn't outperform a GOOD SS in the bass region, or above 18-19Khz.
Dollar for dollar, no way 1/4 the cost 1/10 the distortion.

Now that's something to consider. From 100 hz to 19-20 khz. I'm a valve Guy all the way, But again in the summer months, just like now. Class Ds all the way...2 months or cool night, out comes the Mac and Carys, again.

Regards

tobor007
Sounds like you like your speakers, are adding subs and like your amp. I'm with a couple of other posters and suggest trying a tube preamp to see if it gets you what you are seeking.  I also agree with twoleftears, a 6SN7 tube preamp , but there are other choices.

I love, love love the information guys. My JL's are on the way and starting today I'm going to start checking out tube preamps. When I get the system together I will post a couple of pics and comment on the sound. Dave

Tube watts are not greater than S.S. watts to say so is simply stupid. If you think you hear more volume with a tube amp it is simply distortion or clipping. 

S.S. and tube amp designs each have a series of advantages. Much of which amp will be appropriate is determined by the specifications of your speaker. Efficiency is only 1 pertinent specification. 

Regarding Roger Sanders and his opinions about anything audio related will be completely skewed by his devotion to ESPs. 

I agree with leftears, some of the posters on this forum give the worst advice and seem to take every opportunity to complicate what should be relatively simple issues. 

My advice is to avoid those posters who tell you to sell a product that you like and then give you a specific manufacturer whose product you should buy. 

I see no disadvantages to gear that uses small signal tubes like DACs, preamps, etc. There are numerous reasons why S.S. amps deserve serious consideration in certain circumstances.

@audition__audio   +1

It is ridiculously stupid to suggest that tube watts are greater than SS watts.  Tube amps sound "better" however to me and it's excatly about the even order harmonics, soft clipping,  and the fact tubes have more linear transfer functions than transistors, so tube amplifiers usually need and use much less negative feedback.

Who makes this stuff up about tube watts being greater than SS watts???  lol  Maybe it's how we define greater.....in euphonics.