Somebody out there must need these - shoot me an email for any tubes you're looking for.
I owned a music store and use to order all kinds of great tubes from Mike Mathews at New Sensor. I was going to build a 300b SE amp but never did, so they are sitting around waiting for a new home.
The matching #'s printed on the boxes are "50ma/4.8ma/v". The tubes are still in perfect brand new condition. Included is a paper with the detailed specifications, very thorough. They were produced to carefully match the characteristics, quote, "of the original Western Electric tubes. It's different than the Cetron or Chinese 300b"
"Recommended operating conditions for the average WE and Sovtek 300B:
your tube current on the top of the box is measured under-
Maximum plate dissipation power not to exceed 40watts/tube."
Email any questions or a wish to purchase. New ones are off the usual sanity charts. AA Inmates only please, included are the new old stock CERAMIC sockets and sealed filament pots.
I purchased them here in the USA and will only ship to USA.