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Tube Substitutions for:
 3D21A
 Beam Power Tube
TypeSubstitutesBase Diagram
3D21ACV2659, 5B/152D
Web References3D21A (Brimar) @ Franks Electron Tubes?
3D21A (CBS-Hytron) @ Franks Electron Tubes?
3D21A @ Radiomuseum


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