6351

EMI Emitron secondary-emission pentode for wideband radio-frequency amplification. An internal secondary emitter multiplies electrons, enabling unusually high effective transconductance and gain in high-frequency amplifier stages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 300 mA

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 50000 Ω
Transconductance: 0.05 S
Amplification factor: 100
Max plate voltage: 400 V

EMI Emitron type 6351 is a SECONDARY-EMISSION pentode with an internal secondary emitter that acts as an electron multiplier, enabling very high effective transconductance for wideband RF amplification. Indirectly heated 6.3 V 0.3 A; manufacturer lists maximum anode voltage 400 V and, at anode 350 V and secondary-emitter/screen electrodes 250 V, transconductance around 0.05 S, anode impedance 50 kΩ and amplification factor 100 as recorded. Other numerals in supplied registration are poorly aligned by text extraction; no unsupported screen, secondary-emitter voltage or dissipation promoted. Manufacturer basing designation 9DN; exact canonical socket code left unchanged pending confirmation. Retains PentodeHighFrequency classification as no distinct secondary-emission pentode parent type in current catalog.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

No source-specific operating conditions are recorded.