6D21

High-voltage directly heated pulse-modulator tetrode with a massive filament. It is designed for substantial pulsed power rather than ordinary continuous small-signal amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: GIANT5
Base pins: 5
Nominal heater: 7.5 V / 20 A

Description

Thoriated-tungsten pulse-modulator tetrode for high-voltage pulsed service, convection cooled.

Socket description

Giant 5-contact base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: GIANT5
Base pins: 5
Nominal heater voltage: 7.5 V
Nominal heater current: 20 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

Tetrode

X-ray radiationInterelectrode capacitances

Max plate voltage: 37500 V
Max screen voltage: 2500 V
Max cathode current: 15 A

Section 1 extracted from 6D21.pdf.

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

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

Volt ans
7.5 V
Volt ans 7.5 volts
Grid-plate (maxo.)
75 pF
Grid-plate (maxo.) 75 uuf
OQutput-plate-filament (maxe)
17 pF
OQutput-plate-filament (maxe) 17.0 uuf
Output voltage
32 kV
Output voltage 32.0 Kv
L.Ce grid bias
-1000 V
L.Ce grid bias -1000 volts
Peak positive grid drive
1800 V
Peak positive grid drive 1800 volts
Equlvaleat load resistor
1660 Ω
Equlvaleat load resistor 1660 ohms
Average Ig2 range
4 mA
Average Ig2 range 4,0 to 8.0 ma
Average Igl renge
3 mA
Average Igl renge 3.0 to 6.0 ma
Plate voltags
375 kV
Plate voltags 375 Kv
Screen voltags
2.5 kV
Screen voltags 2.5 Kv
legative control grid voltage
-1250 V
legative control grid voltage -1250 volts