Tube amp for Sourcepoint 8?

Thanks for all the thoughtful responses, guys. 

Soix, we are very much aligned - the two amps that have risen to the top of the  consideration set so far have been the Cronus ("Dark" version) and the Unison Unico Nuovo (or Due). Just not sure how much of a step up they are from the 3510. I'm going to give the speakers another 100+ hours before I think about this at greater depth. 

Atmosphere, I have my dad's ST70 in storage. I had upgraded it with Curcio mods a while back, so it's a little less euphonic than the original (which works in my favor here). I wouldn't want a 50+ year old amp to be my main rig, but at least it can give me a starting point for differences. It's more likely that I'd have better sonic luck with a KT88-based amp than with the EL34s of the ST70, but I can at least contrast. 

Thanks again!

I'd suggest the Cary SLI 80HS and the Margules I-240. Plenty of tube power and sweetness. 

I currently have the Cary paired with Volti Razz, such a great combo for my taste. I like that Cary changed the rectifier stage to SS, (apparently helps with the syrupy nature of previous generations but keeps the warmth of the tubes). Also with the Cary one can switch between Ultra-linear and Triode mode on the fly.

I have heard the Cary with Sourcepoint 10's and enjoyed the session very much. It reminded me of when I worked at our local HiFi shop and we sold Cary and Tannoy. They were a very pleasing combo in my book.  

Thanks, Doyle. I love the Volti stuff - I got to hear a pair of Vittoras a few years ago at Rocky Mountain and was floored (that's where I first heard the Border Patrol DAC, which someone will pry from my cold, dead hands;).

I've always. been intrigued by the Margules. The 10s are a little more fussy in terms of pairing than are the 10s, but still manageable, I think, for either of the amps you mentioned. I appreciate the suggestions! 

I wouldn't want a 50+ year old amp to be my main rig

@mdemaio Why? As long as the power supply has been properly refurbished its a pretty competent amp and also reliable. Plus it can give a decent spanking to a fair amount of new amps.

BTW in the case of the ST70 the bias rectifier should also be replaced.

You can reduce distortion by installing an adapter to allow you to use a 6GH8 as a driver tube instead of the 7199 The 6U8 is the same as a 6GH8. No other modification required.

The weakness of that amp is the 5AR4 rectifier which can't really handle two pairs of EL34s at full power. But as long as you don't push the amp hard it holds up fine. 

Thanks Atmasphere. I've really only kept the ST70 for sentimental reasons (my dad built it when I was in utero). It sounds great, but runs hot, needs to be biased frequently, is cosmetically OK but not particularly beautiful, and most of all I don't have space for an amp and preamp. So it's fine for what it is, but it's not the long-term answer.