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

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

(1) Tested Philco Type 41 Tube Date Code 7U Engraved Base Power Pentode 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 RCA DeForest 802 Tube Engraved Base Type 802 Tube Power Pentode

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

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