mordy
Headphoneus Supremus
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And I think that it is safe to say that the Sylvania and Visseaux tubes don't sound the same.
BTW, I think I remember reading that RCA sold vacuum tube production line equipment to Svetlana in Russia in 1937. There is a certain resemblance between a RCA 6AS7G and a Svetlana 6H13C or equivalent:
BTW, I think I remember reading that RCA sold vacuum tube production line equipment to Svetlana in Russia in 1937. There is a certain resemblance between a RCA 6AS7G and a Svetlana 6H13C or equivalent: