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C299

Cunningham general-purpose detector and amplifier triode for early radio receivers, with published circuit recommendations and operating characteristics.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 3.3 V / 630 mA

Description

C299: Cunningham general-purpose detector/amplifier triode. The complete bulletin was read for construction, ratings, circuit recommendations, and operating characteristics.

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: 3.3 V
Nominal heater current: 630 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

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 425 Ω
Transconductance: 0.0155 S
Amplification factor: 6.6

Published ratings and characteristic constants promoted where applicable; operating recommendations retained as parameters.

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

1931 Cunningham Radio Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Filament/heater voltage
3.3 V
Filament/heater current
630 mA
Plate resistance
425 ohm
Transconductance
15500 uS
Amplification factor
6.6