The values are marked on each tube. Hopefully these will help you in your restorations and upgrades! We have tons of experience!
Item Tag: 12BY7A/12BV7/12DQ7
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10 Nice Tested Vintage Japanese-Made 12BY7A Vacuum Tubes
These were manufactured in Japan by Toshiba and Matsushita. The values are marked on each tube. Hopefully these will help you in your restorations and upgrades! We have tons of experience!