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Tube Substitutions for:
4BU8
Dual Control Duo Pentode

Type	Substitutes	Base Diagram
4BU8	4HS8, 4KF8, 4GS8, 4KE8, 4MK8
Web References	4BU8 (RCA (HB3)) @ Franks Electron Tubes 4BU8 (General Electric) @ Franks Electron Tubes 4BU8 (Tung-Sol) @ Franks Electron Tubes 4BU8 (General Electric) @ Franks Electron Tubes 4BU8 (RCA (RC30)) @ Franks Electron Tubes 4BU8 @ RadioMuseum.org

Type 4BU8
Dual Control Duo Pentode


MECHANICAL DATA

Basing

9FG

ELECTRICAL DATA

HEATER CHARACTERISTICS

Heater Voltage	4.2	Volts
Heater Current	0.45	A

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