I found these Upscale Audio marked tubes today for about a buck a piece. Not all of the notation on the boxes (or the boxes themselves) matched the enclosed tube, so it's unclear if the measurements reflect each of them. (Plus, like a dummy, I took them out and ended up trying to match them up, which just made it more confusing...)
From what I can tell, here's what I have:
8 military-branded Mullard CV4024 / 12AT7
2 military-branded Mullard CV4004 / 12AX7
3 Wurlitzer/GE-branded 12AX7
3 "VTL" EI- branded 12AX7WA (couldn't find much info about this, but it looks like a modern Russian tube?)
1 GE-branded JAN 5670
1 Electro-Harmonix-branded 12AU7A
1 JJ Electronics-branded ECC81/12AT7
Seems the military-branded 12AT7s and the military-branded 12AX7s come from Upscale Audio (those 12AX7s are pricey!), but not sure about anything else. I don't have an ability to test them (or match them), but they "look" good and the getter seems nice and shiny (—is that a way to identify strong tubes?), so I'm hoping these are useable...
If anyone has any info that would be much appreciated!
From what I can tell, here's what I have:
8 military-branded Mullard CV4024 / 12AT7
2 military-branded Mullard CV4004 / 12AX7
3 Wurlitzer/GE-branded 12AX7
3 "VTL" EI- branded 12AX7WA (couldn't find much info about this, but it looks like a modern Russian tube?)
1 GE-branded JAN 5670
1 Electro-Harmonix-branded 12AU7A
1 JJ Electronics-branded ECC81/12AT7
Seems the military-branded 12AT7s and the military-branded 12AX7s come from Upscale Audio (those 12AX7s are pricey!), but not sure about anything else. I don't have an ability to test them (or match them), but they "look" good and the getter seems nice and shiny (—is that a way to identify strong tubes?), so I'm hoping these are useable...
If anyone has any info that would be much appreciated!