12BZ7 tubes


What brand of 12BZ7 tubes are used in Cary/AES amps?
roblanger
Not sure what I have. The tubes are marked with "12BZ7" in gray near the top of the glass but there's no indication of manufacturer.
My Sixpacs came with RCA blackplates. From what i understand, RCA and GE are the best of the 12bz7.