DISCOUNTED since this batch tested lower than an average Brimar CV4024 from the same era.

Brand New, MINT NOS NIB Late 1950s Rare Brimar Military Production 3-Mica CV4024 12AT7WA Black Plates, Halo Getter.  Etched STC Production date codes. Made in England. Relabeled and boxed by Tronix as 6201. Some of the very best Brimar/STC 12AT7/ECC81 type tube

Tested and matched on Hickok 752, just recently calibrated and modified by Hickok expert to all Solid State to eliminate drift. However, on average 12AT7 measures lower on this 752 than it should.

For comparison, 12AT7 measuring 4400-4400 on calibrated Hickok 600 measures 3300-3300 mmhos on this 752. Average new 12AT7 on Hickok 600 is 4000 mmhos. In other words, actual test scores are higher than what we have noted on the tube box.

Single Tube = $45. Select 2 for a Matched Pair.