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Recently upgraded ST-70. Where'd the bass go? (Heresy I
therobbstory posted a topic in Talkin' Tubes
Long time reader, first time poster. So in the last month, I've acquired a pair of very nice Heresy I speakers dating back to 1984. I've also picked up a Dynaco (kit) ST-70 which was in pretty rough shape. I immediately rebuilt the crossovers with a Crites kit, and rebuilt the entire ST-70 with a Bob Latino VTA 6SN7 octal kit, retaining only the trafos, quadcap, choke and rectifier tube. Prior to the amp rebuild, sound was decent. Full-bodied, good sound stage, and listenable bass. Post rebuild, everything sounded better. Exception: the bass was gone. Like someone took the slider on the far left of the EQ and pushed it all the way down. I listen to a lot of jazz which is what informed the purchase of these components. Two suspected factors: The 6SN7 is a power hungry tube. I may be starving it a little by keeping the stock transformer. The trafo gets hot to the touch, and there's some mechanical hum which can be heard through the speakers. I've ordered a new one from Triode. Output tubes are cheap Chinese EL34s I got off ebay for $30. I just wanted to get something plugged into the sockets to make sounds come out of the speakers. I'll likely order some Gold Lion KT66 based on Bob Latino's glowing (heh) review. Am I on the right track here? Speakers are on Crites risers about 6 feet apart, maybe a foot away from the wall, and about 5 feet from my listening position. These are the first horns I've owned, and I'm LOVING the mids/highs. Before I run out and buy a sub, I'd like to know what I can be fixing first.
