1C4

Super-control remote-cutoff radio-frequency amplifier pentode.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: 4
Nominal heater: -

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: -
Nominal heater current: -
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

No fixed ratings are recorded for this section.

Radiotron 1C4 directly heated super-control remote-cutoff RF amplifier pentode with small four-pin base and grid top cap. Manufacturer states 1M5-G electrical equivalence except base construction; capacitor values grid-to-plate with shield 0.010 pF, input 6.0 pF, output 9.5 pF. Printed 1C4 filament ratings are unclear in the available extraction, and counterpart 1M5G current conflicts with apparent scanned value, so no nominal heater values are inferred. Section index corrected from 0 to 1; single physical pentode retained.

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

9999 Mixed 1000

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Grid-to-plate capacitance
0.01 pF
Grid to plate with shield
Input capacitance
6 pF
Input capacitance
Output capacitance
9.5 pF
Output capacitance