Matched is best these tubes aren't even close!!! What you want to know is the Gm, best would be NOS 14500/14500 and 14500/14500 and above. My understanding is if the sections aren't matched the tubes will vibrate and become noisy at high volumes. I say pass on the tubes your looking at and find a seller that gives you Gm readings and doesn't try to fool or confuse you with with mA only readings!!!!
Tubes - How close to be a 'matched' pair?
I'm considering buying some NOS 12AX7s or 12AU7s. How close do the mA ratings have to be to be considered matched? I've seen some 12AX7s with overlapping ranges and the lower limit being within .08 mA of each other. For example: Tube1 .18-.28 mA and Tube2 .26-.34 mA. Does this qualify as a matched pair?