6SN7GTB BLACK PLATE
Impossible to find double triode amplifier tubes manufactured in USA/Canada by renowned RCA. These beautiful approx. 1970's 8 pin octal based glass tubes come with black plates and round side getters. They are glass etched 6SN7GTB MADE IN CANADA with various production codes. Boxes are standard RCA new style red printed 6SN7GTB. Photo is typical of available inventory.
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