I've been listening to my VTA-modded ST-70 for well over a year now, using 6p3s-e output tubes. I'm thinking of trying a different output tube; maybe GL KT66? Overall, I'm happy with the sound but I often feel like I could use a little more bass... I'm listening to Klipsch KLF-30 speakers: a dual 12" woofer, horn midrange and tweeter speaker with 102dB efficiency. I've got the "low gain" board, with a center Tungsram E80cc and Sylvania 12BH7.
Now I'm not one to go crazy with bass, in fact if I turn these up fairly loud they're pretty even. I don't often listen like this, however.
I'm hoping to get some opinions of anyone's experience with differing power tubes in their ST-70...how did it change the sound? Which did you like better? What are your speakers?
Any and all opinions welcomed!