I'm sure the EH tubes are fine but I'm pretty sure some USA made tubes would probably sound better. I have a stash of old 6SN7's that test good on my Eico 666 but I'm not familiar with the concept of "matched quads" of preamp tubes. I get it for power tubes in guitar amps.
Am I okay using some of my stash in the SP14 without any "matching"? I have GE, Raytheon, Sylvania, Zenith, etc. Of course, I don't have any way to tell if these tubes might be microphonic.
Or should I buy a "matched quad" of NOS 6SN7's from a dealer? I've noticed the prices on these vary WIDELY.
Thanks for the advice. I'm sure I'll have other questions after the gear arrives as I've never used a stand alone phono pre-amp.