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Tube Substitutions for:
 StR90/40
 Voltage Regulator, single
TypeSubstitutesBase Diagram
StR90/4090C1
Web ReferencesStR90/40 (RFT) @ Franks Electron Tubes?
StR90/40 (RFT) @ Franks Electron Tubes?
STR90/40 @ Radiomuseum


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