6SN7GTB-RCA-BG Tube, Medium-Mu Twin Triode, Full Base, Black Glass, CKR-6SN7GT
Early 6SN7GT have the WWII era blacked glass. These are military grade tubes and are guaranteed to improve the sound of your system.
MFR: RCA (US Navy)
Limited Quantity Available, New Old Stock (Marked with E3) Not for Export
|Made in the USA||Yes|