I'm glad that others are also finding that the F2a's are great tubes in the TRP. They are definitely worth the price. For several months now, I've been using a Spanish Marconi U50/80 as rectifier. I like that tube a lot. Also the GZ480 is terrific with the F2a's. I haven't done any more experimenting than that. If the WE 274B is reissued, it will be worth trying. I'm also interested in what others are using.Yes, indeed! Also sounding sublime with the Sophia 274b and GZ480 recti. A Marconi U50/80 recti is up next in the rotation.
Phonatix and Ron, what rectifier are you running with your F2a's?
For burn-in, I let the F2a's play for 3 days while I was traveling working on an FDA submission and they sounded wonderful upon return and that didn't change for the following weeks. If they live 10,000 hours in a hard-driven amp circuit, they should live a long and privileged life in the TRP.
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