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

(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 9U Power Amplifier Pentode Tube

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

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

(1) Tested Philco 7B5 Tube Date Code 0-0 Philco Loktal Loctal Power Pentode

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