2 CLEAN & Tightly MATCHED Pair of Raytheon made for Baldwin 12AX7 / ECC83 Preamp tubes.  Identical date codes on all the tubes from 1960 Vintage.  They both feature long, BLACK plates with a top-mounted, "O" getter.  Very CLEAN tubes with clear lettering and nice straight pins.  Test VERY STRONG, at NEW / NOS level with BALANCED sections on my Amplitrex digital tester.    Results:

TUBE 1:   1,700  /  1,600
TUBE 2:   1,700  /  1,700



     Average NEW / NOS spec for this type is 1,600 / 1,600 with 1,120 / 1,120 being considered MINIMUM GOOD.






 


     
     I have two of the best tube testers ever made that I use to fully test tubes.  The Amplitrex AT-1000 Digital tester and the Triplett 3444 (with digital plate current meter) Tube Analyzer are both mutual conductance testers that can test just about any tube ever made between the two of them and can test for shorts/leakage, noise, gas, emissions, and transconductance.  
     Thank you for choosing Valves-Tubes!