Good to know. I admittedly don't have any experience with GE octal power tubes. My opinion of the small octals and 9-pinners prevented me from ever buying any. I tried a pair of the long plate 12AX7's a good while back in a phono stage, but I can't tell you what vintage they were. Both were too noisy to get a good handle on their sound, but to be fair phono stages can be especially finicky with high gain tubes. That's just me though, and I'm sure many here will attest to the fact I'm weird.