Telefunken 12AX7 smooth plate (matched pair) real NOS from Brent Jessee

A matched trio was purchased from and tested by Brent Jessee as NOS in May 2013.  They have NEVER been used. I did not need them and just never got around to reselling them. These tubes are NO LONGER available from Brent Jessee. 
From Brent Jessee -- "The finest Telefunken diamond mark smoothplates, NOS, in OEM medical equipment box or whitebox. These are all Telefunken labeled, an all have the blue painted tips indicating extensive screening for use in medical equipment. Very fine tube, in great demand, especially this smoothplate version. Nearly all excellent labels on these. These do not have the cloth "selected tube" labels but are still medical graded tubes that were Grass Instrument (mainly for EEG machines) stock. All are the real deal, with the diamond mark in the bottom glass. These are rare matched pairs, with transconductance matched to within 2 percent. These pairs have been tested in my amplifier for noise, stereo balance and image, and microphonics, then reconfirmed the match on the tube tester. These are dead quiet at full volume, not microphonic, and sound great! You can't get rare quality and careful hand selection like this on eBay!! SINGLE TUBES ARE $150.00 WHEN AVAILABLE. $350 PER PAIR."

PRICE IS FOR A SINGLE TUBE. The pair has been sold.