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Original Message
RE: Antique Sound Lab 6550 Tubes - made by ?
Posted by Blackdog on May 27, 2020 at 16:45:54:
At one time there were quite a few Chinese tube manufacturers. Most of their tubes never left Asia unless they were re-brands like these, much like they now do with electronics. These manufacturers would make anything you wanted for a price. So good luck figuring out who made them.
Later ASL tubes (once Divergent took over) were made by Shuguang, and have metal bases.
FYI - Valve Art are made by Shuguang to Valve Art's specifications. Usually very rugged tubes.