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Tube Tinker — Electron Tube Database
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Specialized - Switching Tube ·Tetrode

QEP2018

Pulse-modulator tetrode for high-voltage pulse systems. Its heater and electrode structure are optimized for substantial short-duration power rather than ordinary continuous amplification.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
26 V / 2.25 A

Description

Indirectly heated tetrode designed for pulse-modulator service with inductive or resistive loads. The Philips sheet specifies pulse and average anode limits, screen-grid ratings, capacitances, and thermal limits.

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
26 V
Nominal heater current
2.25 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
20000 V
Max screen voltage
1500 V
Max plate dissipation
60 W
Max screen dissipation
8 W

Pulse-modulator tetrode

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

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • Heating : indirect; oxide cathode vr

    26 V

  • Chauffage: indirect; cathode a oxydes ir

    2.25 A

  • gapacizgnces Cagt

    0.3 pF

  • Va = max

    20 kV

    Modulator

  • Vap = max

    25 kv

  • Vg2 = max,

    1500 V

  • Vg1 = max.,

    1000 V

  • Vgip = max,

    300 V

  • Tap = max

    18 A

  • Ta = max

    60 W

  • Wia = max

    360 W

  • Wg2 = max

    8 W

  • Iap

    < 5 A

  • Timgp = 2

    2 us

  • Yba = 15,8

    20 kV

  • Vg2 = 1250

    1250 v

  • Vel = =600

    600 V

  • Vel ygp = 700

    700 V

  • Vap = 25

    25 kv

  • Ia imp = 14

    6 A

  • lap = 16

    18 A

  • Igz imp = 4

    3 A

  • Ig1 imp = 1,1

    1.1 A

  • Le tube ne fonctionnera pas plus longtemps gue

    5 us

  • dans chaque intervalle de

    100 us

  • maximum ratingof

    60 W

  • liaximalwert von

    60 W

  • B 1957.12.12

    6 C