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

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

(1) Tested National Union Type 35 Tube Engraved Base Date Code J Tetrode Tube

(1) Tested Tung-Sol Type 24 Tube Engraved Base Date Code 7-3 Tetrode Tube

(1) Tested Philco Type 41 Tube Date Code 7U Engraved Base Power Pentode Tube

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

(1) Tested Coronado Type 27 Tube with Engraved Base Date Code Y 27 Tube Triode

(1) Tested RCA 2E26 Tube Date Code NEA Micanol Wafer Base Beam Tetrode Tube