Matsushita made the 7DJ8, heater rating is 7 volts but can be used as a 6DJ8 substitute. Mullard set up the factory in Japan for them. Supposed to sound good.
Wait... These should be Vo... Voskhod 6n23p? Because there's the rocket logo: https://www.thetubestore.com/russian-6h23-standard
Think I got the same ones as yours, inexpensive and slightly better than model EH 6922 IMO.
Russian military grade are often better than 'base' versions of the same tube but don't often get ranked 'best' on the internets. Very good for the value though
@ogodei They don't have the romance of windmill getters, black plates, etched glass, obscure plants and the like. They're all about performance and reliability.
-EB (or -EV or -I) on Russian tubes indicates extended service life, low noise & microphonics. Usually there are structural differences from the base tube (e.g., 'military grade' build) but sometimes they just stamp the tubes that measured the best.
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