Nostalgia Air: Tube Substitution for 840

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Tube Substitutions for:
840
R.F. Pentode

Type	Substitutes	Base Diagram
840		5J
Web References	840 @ RadioMuseum.org

Type 840
R.F. Pentode

MECHANICAL DATA

Basing

ELECTRICAL DATA

HEATER CHARACTERISTICS

Heater Voltage	2	Volts
Heater Current	0.13	A