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Voltage Pentode - High Frequency (single) ·Pentode

R122N

Long-life professional pentode designed for voltage amplification, with high-frequency or wideband service where specified by the manufacturer.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 18 V / 225 mA

Description

Long-life voltage-amplifier pentode.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: 9
Nominal heater voltage: 18 V
Nominal heater current: 225 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: 1000000 Ω
Transconductance: 0.00555 S
Max plate voltage: 225 V
Max screen voltage: 225 V
Max plate dissipation: 2 W
Max screen dissipation: 0.5 W
Max cathode current: 12 mA

Pentode section; promoted values are taken from the approved source where explicitly published.

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

1953 La Radiotechnique

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

indirect (cathode isolee du filament)
18 V
Pentode

Other

Plate voltage
200 V
Pentode
Screen-grid voltage
200 V
Pentode
Suppressor-grid voltage
0 V
Pentode
Control-grid voltage
22 V
Pentode
Plate current
8 mA
Pentode
Screen-grid current
416 mA
Pentode
Plate resistance
1 Mohm
Pentode
_Transconductance
5.55 mA/V
Pentode
Plate voltage
225 V
Pentode
Screen-grid voltage
225 V
Pentode
Plate dissipation
2 W
Pentode
Screen-grid dissipation
5 W
Pentode
Cathode current
12 mA
Pentode
Grid-circuit resistance 1
1 Mohm
Pentode
Heater-cathode voltage
50 V
Pentode

Capacitance

Input capacitance
95 pF
Pentode
Output capacitance
95 pF
Pentode
Coupling capacitance
0.03 pF
Pentode
Input capacitance
124 pF
Pentode