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

(1) Tested Arcturus Type 41 Tube Date Code E5 Arcturus Power Pentode 41 Tube

(1) Tested Strong Sylvania 5V6GT Tube 5V6 GT Beam Power Output Tube

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

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

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

(1) Tested Philco Type 41 Tube Date Code 9U Power Amplifier Pentode Tube

(1) Tested RCA Type 41 Tube Date Code H6E Meatball Logo Power Pentode 41 Tube