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Voltage - Triode (single) ·Triode

345

Early Cunningham triode documented for receiving-equipment service; available source metadata does not support a narrower functional assignment without speculation.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
4
Nominal heater
2.5 V / 1.5 A

Description

The 345 is a triode described in the Cunningham Radio Tube Manual for detector, amplifier, oscillator, rectifier, or power-output service as applicable to the type.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
4
Nominal heater voltage
2.5 V
Nominal heater current
1.5 A
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

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
1750 Ω
Transconductance
0.002 S
Amplification factor
3.5
Max plate voltage
275 V

Core published characteristics promoted conservatively from the approved manual sheet.

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.

Data set 01

193X Cunningham

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Heater/filament voltage

    2.5 V

    Published nominal

  • Heater/filament current

    1.5 A

    Published nominal

  • Transconductance

    2000 uS

    Published characteristic

  • Amplification factor

    3.5

    Published characteristic

  • Plate resistance

    1750 Ohm

    Published characteristic