Alternatives & variations Download PDF datasheet

5CP11A

Five-inch special-purpose direct-view oscilloscope CRT with electrostatic focusing and deflection plus post-deflection acceleration. Its P11 blue short-persistence screen favors fast waveform presentation.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: 612-37
Socket code: DUODECAL11
Base pins: 12
Nominal heater: 6.3 V / 600 mA

Description

Five-inch special-purpose direct-view CRT with electrostatic focus/deflection and post-deflection acceleration.

Socket description

Duodecal 11-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 612-37
Socket code: DUODECAL11
Base pins: 12
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

612-37 - 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: 4000 V

CRT maximum accelerating/anode/ultor voltage is promoted to MaxPlateVoltage; additional electrode ratings, capacitances, operating conditions, deflection/focus and optical data are preserved 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
9 pF
Grid No. 1 to all other electrodes capacitance
8 pF
Deflection plates 1-2 capacitance
2 pF
Deflection plates 3-4 capacitance
2 pF
Deflection plate 1 to all other electrodes capacitance
9 pF
Deflection plate 2 to all other electrodes capacitance
9 pF
Deflection plate 3 to all other electrodes capacitance
7 pF
Deflection plate 4 to all other electrodes capacitance
8 pF

Other

Maximum anode No. 3 voltage
4000 V
Maximum anode No. 2 voltage
2000 V
Maximum anode No. 1 voltage
1000 V
Maximum negative grid No. 1 bias magnitude
200 V
Peak heater-cathode voltage
125 V
Peak voltage between anode No. 2 and any deflection plate
500 V
Recommended anode No. 3 voltage
4000 V
Recommended anode No. 2 voltage
2000 V
Focus voltage range
375 to 690 V
Grid No. 1 cutoff voltage range
-90 to -30 V
Deflection factor plates 1-2
92 V/in
Deflection factor plates 3-4
78 V/in

CircuitValue

Grid No. 1 circuit resistance maximum
1.5 MOhm
Deflection circuit resistance maximum
5 MOhm

Data set 02

1971 RCA HB3 Binder 1 of 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Maximum anode 2 voltage
2000 V
Maximum anode 1 voltage
1000 V
Peak heater-cathode voltage
125 V
HeaterNegative
Peak heater-cathode voltage
125 V
HeaterPositive
Maximum accelerating/anode voltage
4000 V
ANODE-No.3 VOLTAGE
4000 V
Maximum
ANODE-No.2' VOLTAGE
2000 V
Maximum
ANODE-No.l VOLTAGE
1000 V
Maximum
ANY DEFLECTING ELECTRODE
500 V
Maximum
Grid-No.l-Circuit Resistance 1
5 MΩ
Maximum
'~ It is recommended that anode-x0.3 voltage De not less Loan
3000 V

Capacitance

Grid 1 to all other electrodes capacitance
8 pF
Approximate
Cathode to all other electrodes capacitance
9 pF
Approximate

Characteristic

Grid No.1 to All Other Electrodes
8 pF
Cathode to All Other Electrodes
9 pF
DJ1 to All Other Electrodes
9 pF
0.12 to All Other Electrodes
9 pF
DJ3 to All Other Electrodes
7 pF
DJ4 to All Other Electrodes
8 pF