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

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

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

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

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

(1) Tested RCA Victor Type 38 Tube Date Code 613 RCA 38 Tube Power Pentode Tube