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Specialized - Cathode Ray ·CathodeRay

5BTP2

Five-inch direct-view oscilloscope CRT with flat clear faceplate, electrostatic focusing and deflection, post-deflection acceleration, high deflection sensitivity, and a P2 phosphor screen.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
DUODECAL12
Base pins
12
Nominal heater
6.3 V / 600 mA

Description

Five-inch direct-view oscilloscope CRT with flat clear faceplate, electrostatic focus/deflection, post-deflection acceleration, and high deflection sensitivity.

Socket description

Duodecal 12-contact color CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
DUODECAL12
Base pins
12
Nominal heater voltage
6.3 V
Nominal heater current
600 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

Cathode Ray

X-ray radiationInterelectrode capacitances
Max plate voltage
4400 V

CRT highest published anode/accelerating voltage is promoted to MaxPlateVoltage; additional electrode, deflection, optical, and capacitance data are 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

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Capacitance

  • Cathode to all other electrodes capacitance

    5 pF

  • Grid No. 1 to all other electrodes capacitance

    8 pF

  • Deflection plates D1-D2 capacitance

    2 pF

  • Deflection plates D3-D4 capacitance

    3 pF

  • D1 to all other electrodes capacitance

    10.5 pF

  • D2 to all other electrodes capacitance

    8.5 pF

  • D3 to all other electrodes capacitance

    8.5 pF

  • D4 to all other electrodes capacitance

    9.5 pF

Other

  • Maximum anode No. 2 input

    6 W

  • Maximum anode No. 3 voltage

    4400 V

  • Maximum anode No. 2 voltage

    2700 V

  • Maximum anode No. 1 focus voltage

    1100 V

  • Maximum negative grid No. 1 bias magnitude

    140 V

  • Peak heater-cathode voltage during warm-up

    450 V

  • Peak heater-cathode voltage after warm-up

    140 V

  • Peak voltage between anode No. 2 and any deflection plate

    600 V

  • Deflection factor D1-D2

    81 to 109 V/in

  • Deflection factor D3-D4

    43 to 58 V/in

Characteristics

  • Maximum undeflected spot-position square

    15 mm

  • Useful scan D3-D4

    4 in

CircuitValue

  • Grid No. 1 circuit resistance

    1.5 MOhm

  • Deflection circuit resistance

    1.5 MOhm