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

(1) Tested Philco Type 24A Tube Engraved Base Date Code U6 24 A Tube Tetrode

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

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

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

(1) Tested Philco 5Y4G Tube Date Code 08 Philco Engraved Base 5Y4 G Rectifier

(1) Tested Sylvania Type 27 Tube with Engraved Base Date Code E6R 27 Tube Triode

(1) Tested Philco Type 41 Tube Date Code 6S Engraved Base Power Pentode 41 Tube