Out of what you're considering, I would go with the 30/70, especially if it's the Sig version. It's one hell of an amp. Don't let anyone try and tell you a KT88 amp is better than the Ren series. I don't know your speaker but the Vac 30/70 has very good transformers, and will drive a wide range of speakers. And if it so happens it doesn't drive your speaker, change to a different speaker. Seriously, that's a great amp. If you are stretching your budget, the LM amps are very nice as well. I have heard the 508, and was impressed, but the Vac 30/70 was...Did I say it's one hell of an amp (-: All that said, I am a believer in spreading out your funds so that your system is well balanced. Think system!!!!
VAC 30/70...pick your pre?
Considering a pair of VAC 30/70’s however concerned a bit about matching the Pre well; on the other hand, can’t spend another 5-6k on a line stage right now. Thoughts? Recs? Get a better integrated instead for now? Ideas about Line Magnetic 219 vs. Allnic T2000; pushing Wharfedale Jade 5's (87db 6ohm)