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5BTP1

Five-inch direct-view oscilloscope CRT with flat clear faceplate, electrostatic focusing and deflection, post-deflection acceleration, high deflection sensitivity, and a P1 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

Cathode-ray electron-gun/display section.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Heater Voltage
6.3 V
Nominal
Heater Current
600 mA
Nominal

Data set 02

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