I really don't remember anything other than Burroughs brands on the 30+ tube I bought, but it has been 40+ years for most of them. I recently repaired two clocks for non-Nixie failures, and between the 12 in those two clocks and the 6 that I swapped in on general principles, I only remember seeing Burroughs. I have no reason to believe that any of them were NOS, and I assume they were all pulls (since I would have been too impoverished to pay the premium for NOS). Maybe the Ultronics branded tubes were in the newer displays. BTW, was Ultronics the only manufacturer to use B7971's in their products?
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