(1) Tested RCA Cunningham Type 41 Tube Engraved Base Date Code J12 Power Pentode

(1) Tested RCA Cunningham Type 41 Tube Engraved Base Date Code J3 Power Pentode

(1) Tested RCA Cunningham Type 55 Tube Date Code F2 Engraved Base RCA 55 Tube

(1) Tested RCA Radiotron Cunningham Type 55 Tube Code L12 Engraved Base

RCA CUNNINGHAM TYPE 47 TUBE - TV-7 TESTED - ENGRAVED BASE

(1) Tested RCA Cunningham Type 34 Tube Date Code Z4 Engraved Base Foil D Getter

(1) Tested GM Genuine Parts 6V7G Tube I7 Engraved Base General Motors 6V7 G Tube

(1) Tested Philco 6B8G Tube Date Code 6S Engraved Base 6B8 G Twin Diode Pentode