RCA Matched Pair (2) 6FQ7 tNOS AT1000 TESTED Vacuum Tubes T4 cleartop 6CG7 no divider dual triode 1964-1972

This listing is for a Matched (10% in GM) Pair (2) of RCA-made 6FQ7 6CG7 no divider dual triode vacuum tubes in the standard tube shape. They have a 9LP miniature 9-pin base, grey plate, and side getter. Some of our stock is re-labeled or marked with the OEM of Zenith, Sencore, Curtis-Mathes, Magnavox, Amperex, Wards Super Airline, CBS, Silvertone. If you're looking for a particular brand, please message right as you order - we pack and ship quickly!

This is the last type of 6CG7/6FQ7 made by RCA, called T4 at Sound by Doc.

Your tubes have been fully tested on a computer-regulated, USA-made Amplitrex AT1000 on Fixed Bias setting with like new, NOS results (tNOS). Here's what that means: to qualify for this listing, several stringent conditions must be met: The transconductance for each section must measure between 2080 uMhos and 3120 uMhos, consistent with original 1964 RCA, Western Electric, Sylvania, GE, and/or Tung-Sol datasheet specifications for new tubes of this type. The tubes must also show no shorts, show a gas current less than 0.9 mA, and a heater-to-cathode leakage of less than 10 microamps (10 uA). The tubes might have mechanical wear or have the label rubbed off - these are very old! Used-testing tubes are available in a separate listing at a significant discount. Every tNOS or Used Good tube you receive from Sound By Doc is guaranteed against failure for 60 days after purchase, an industry extreme!

OPTIONS (use offer feature in Reverb):

Want a regular white box? $1 extra per tube
Want a tube that's packed in its original box? $3 extra per tube
Want the test results recorded on your box, too? $3 extra per tube