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Tube Substitutions for:
ECH4
Triode-Heptode

Type	Substitutes	Base Diagram
ECH4
Web References	ECH4 (Philips) @ Franks Electron Tubes? ECH4 (Philips) @ Franks Electron Tubes? ECH4 (Philips) @ Franks Electron Tubes? ECH4 @ Radiomuseum

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