Ive found on a transparent system the 12au7's make a large diffrence on the zeus. to me the RCA Long Black plates are just endlessly listenable, while not ruler flat in responce the width, depth, is just staggering.The rca clear tops are fine on some material but seem too colored.
On My old 120's I found the tunsgram 12ax7 was nice though i didnt have many to roll. I had a NOS Pair USAF 5751 Black plate triple sylvania's that just put everything over the top. The guy with the hot highs on the 150's harness that sound and enjoy you will miss it if you every switch.
On My old 120's I found the tunsgram 12ax7 was nice though i didnt have many to roll. I had a NOS Pair USAF 5751 Black plate triple sylvania's that just put everything over the top. The guy with the hot highs on the 150's harness that sound and enjoy you will miss it if you every switch.