For me its the first or very early LP's of: Allman Brothers - "Allman Joys" "Idyllwild South" Santana - "Santana" 200 g reissue Emerson Lake and Palmer - "Emerson Lake and Palmer" and, Beethoven - "Piano Concerto No. 4 in G Major" Rudolph Serkin/Ozawa/BSO
Yep Tim, I have a couple sets of extra 12au7’s. And yea, did think about installing them as a check. But again, everything seems to sound back to normal with the Brimar’s, so….
I am wondering if the tube in the weak channel may not have been fully seated? If it was bad tube, it should have followed to the other speaker when you switched them.
I wouldn’t do anything more Brian just yet, keep an ear on it, maybe one of the sockets loose, pin bent, dirt, reinserted fixed it….hopefully for good. in future, i switch cables L to R to isolate to a component, you may have done that to arrive at phono preamp…. You have find decent B and K Tube testers for $75 - $100 ish also. w Tubes spares are your friend…
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