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Tube Substitutions for:
UBL21
Double Diode-Pentode

Type	Substitutes	Base Diagram
UBL21	UBL71, UBL21(N)
Web References	UBL21 (Philips) @ Franks Electron Tubes? UBL21 (Philips) @ Franks Electron Tubes? UBL21 (Philips) @ Franks Electron Tubes? UBL21 (Tesla) @ Franks Electron Tubes? UBL21 @ Radiomuseum

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