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01A / 201A / 301A / 401A
01A tube types are 4-pin low-mu power triode tubes.
This rare vintage tube is an 00A triode labeled "Champion." Its globe bottle is completely enveloped in flashing and it has an engraved black base.
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This 1920s RCA Radiotron UX-201A / 201-A triode is compatible with any long-pin 01A type tube (201A, 301A, UX-201A, CX301A). Its globe bottle is completely enveloped in flashing and its base is engraved with the RCA logo. Tube tests as new.
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The RCA Radiotron UX-201A tubes in this precisely matched pair are antique power triodes. Their globe bottles are completely enveloped in flashing and they have engraved black bases. Both tubes test and are matched for current draw and transconductance.
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TC Tubes specializes in precision testing and matching of vintage and new production vacuum tubes for guitar & bass players, audiophiles, and DIY tube audio enthusiasts. Our website features secure payment options and fast, convenient shipping around the world.
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