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

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

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

TESTED-RCA CUNNINGHAM Radiotron Type 57 Engraved Tube Radio, TV Amp,

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

(1) Tested RCA Cunningham 6Q7G Tube Engraved Base

(1) Tested Philco Type 44 Tube Engraved Base Date Code L3 Pentode Tube

RCA Radiotron Cunningham Type 71A tubes. Amplitrex 86% gm. Engraved bases.