6SN7GTB RCA Coin Base

NOS 6SN7GTB RCA VT-231 tubes made in the U.S in 70s. Clear glass, black ribbed plates, red printing, side ring getter

Closely matched pairs and quads

The same ribbed plates like 56′ 6SN7

Also the same mica spacers, the only difference is base and getter type and position

 

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