Deleeh
Headphoneus Supremus
This is a photo of your tube and I see a code low down, below bottom mica through the glass and the first digit looks like the Heerlen factory code. I can't see the date code that comes after.
Unfortunately I don't see any code on the tube except the one with the white chalk colour.
@mordy Thank you, I saw a nice cheap Ken Rad pair,.
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