Quote:
Originally Posted by benman94
If B+ on the 6BQ5s 360 volts or less I'd say feel free to use any 6BQ5 variant (except the Chinese tubes and the NOS Euro trash).
If the B+ is greater than 360 volts, I'd say either buy new Russian 6BQ5s, or pony up the dough for some NOS GE 7189As.
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I bought an octet of JJ EL84's, which seemed it be alright. Made in the Slovak republic.
The Russian tubes I'm not too crazy about are the Sovtechs. One tube from a so-called matched quad red-plates, where the other three seem to be alright.
The amplifier is a Harmon Kardon Citation II, totally recapped. I even replaced the bias pots with Allen-Bradleys. That tube red-plated no matter which socket it was in.
