Telefunken 12AX7 7025 ECC83 <> Mark Red Tip 1968 Smooth Plate Medical Grade

AT LAST, MORE just in of these incredible Medical Grade tubes! Hickok tested, and then ear tested in a preamp! The finest Telefunken diamond mark smoothplates, NOS, that have been further aftermarket screened for low noise, low microphonics, and balance for use in Grass Valley medical and hospital equipment. These have the red painted tips, indicating they passed noise testing for the particular stage in Grass medical equipment.  Critical use in hospital or aerospace test equipment demanded tubes with super low noise, and tightly controlled output, and these beauties deliver! The ultimate tube for tube mics and mic preamps! Very fine, very rare tubes, in great demand, especially this selected version. Excellent labels on these. These are all Tele labeled,  all are the real deal, with the diamond mark in the bottom glass. These are Gm tested by us,  with transconductance tightly controlled internally and from tube to tube. Incredibly accurate, the amazing sound image emerges out of a dead quiet background. Compare prices.....you get one of these for way less than ONE  Telefunken ECC803S and the quality is the same or better!!!   These are $25 off our web page price.  Paypal payment only, and we ship by first class mail to the address provided by Paypal.   The full value is declared on the customs forms for any international buyers, and delays can happen in customs, which is beyond our control.