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3SP2

Three-inch cathode-ray tube for oscilloscope and instrument display service, using electrostatic focusing and electrostatic deflection. Its P2 screen designation identifies the phosphor variant within this compact oscillographic family.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: B12A
Base pins: -
Nominal heater: 6.3 V / 600 mA

Description

Three-inch rectangular direct-view oscilloscope CRT with electrostatic focus and electrostatic deflection.

Socket description

Duodecal 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B12A
Base pins: -
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

No fixed ratings are recorded for this section.

CRT section; maximum anode voltage 2750 V and capacitances retained in parameter table.

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

Characteristic

Phosphor
P2
Focusing Method
Electrostatic
Deflecting Method
Electrostatic

Other

Typical Anode No. 2 Voltage
2000 V

Data set 02

1960 Waterman Products

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Heater Voltage
6.3 V
. Heater Voltage ... . 6.3 Volts
Heater CUTTENt est tssess smsessasssssseenes [1]
600 mA
Heater CUTTENt est tssess smsessasssssseenes 0.6 == 10% Amperes
Heater CUTTENt est tssess smsessasssssseenes [2]
10 A
Heater CUTTENt est tssess smsessasssssseenes 0.6 == 10% Amperes
Cathode to all other electrodes
5.6 pF
Cathode to all other electrodes 5.6 ppf
Grid [1]
1 pF
Grid 1 to all other electrodes 8.3 ppf
Grid [2]
8.3 pF
Grid 1 to all other electrodes 8.3 ppf
Positive voltage on D3 deflects beam approximately toward pin £
4
Positive voltage on D3 deflects beam approximately toward pin £ 4
D1-D2 are nearest to the screen (
3
D1-D2 are nearest to the screen (3” Dimension)
Anode Voltage (A2)
2750
Anode Voltage (A2). 2750 Vuolts DC
Anode (A2) loput
6
Anode (A2) loput ... 6 Watts
Anode # [1]
1 V
Anode #1 (Focusing Elcclrode) VO]ULC 1100 Volts
Anode # [2]
1100 V
Anode #1 (Focusing Elcclrode) VO]ULC 1100 Volts
Grid #
1
Grid #1 (G1) Voltage
Peak Voltage between Anode £ [1]
2 V
Peak Voltage between Anode £2 and any deflecting plate ... 550 Volts
Peak Voltage between Anode £ [2]
550 V
Peak Voltage between Anode £2 and any deflecting plate ... 550 Volts
Focusing Electrode (A1} Current for any operating condition [1]
-15 A
Focusing Electrode (A1} Current for any operating condition ... —15to +~10 xAmps
Focusing Electrode (A1} Current for any operating condition [2]
10 A
Focusing Electrode (A1} Current for any operating condition ... —15to +~10 xAmps
Spot Position (undeflected) (NOTE [1]
1 mm
Spot Position (undeflected) (NOTE 1) 12 Max. mm
Spot Position (undeflected) (NOTE [2]
12 mm
Spot Position (undeflected) (NOTE 1) 12 Max. mm
A1 Voltage [1]
16.5
A1 Voltage 16.5% to 31% of A2 Voltage
A1 Voltage [2]
31
A1 Voltage 16.5% to 31% of A2 Voltage
G1 Voltage [1]
2.8
G1 Voltage 2.8% 1o 6.7% of A2 Voltage (NOTE 2)
G1 Voltage [2]
1
G1 Voltage 2.8% 1o 6.7% of A2 Voltage (NOTE 2)
G1 Voltage [3]
6.7
G1 Voltage 2.8% 1o 6.7% of A2 Voltage (NOTE 2)
G1 Voltage [4]
2
G1 Voltage 2.8% 1o 6.7% of A2 Voltage (NOTE 2)
Anode Voltage (A2) [1]
500 V
Anode Voltage (A2) 500 1000 2000 Volts
Anode Voltage (A2) [2]
1000 V
Anode Voltage (A2) 500 1000 2000 Volts
Anode Voltage (A2) [3]
2000 V
Anode Voltage (A2) 500 1000 2000 Volts
Focusing Electrode Voltage (Al) [ [1]
82.5 V
Focusing Electrode Voltage (Al) [ 82.5to 155 165 to 310 330t0 620 | Volts
Focusing Electrode Voltage (Al) [ [2]
155 V
Focusing Electrode Voltage (Al) [ 82.5to 155 165 to 310 330t0 620 | Volts
Focusing Electrode Voltage (Al) [ [3]
165 V
Focusing Electrode Voltage (Al) [ 82.5to 155 165 to 310 330t0 620 | Volts
Focusing Electrode Voltage (Al) [ [4]
310 V
Focusing Electrode Voltage (Al) [ 82.5to 155 165 to 310 330t0 620 | Volts
Focusing Electrode Voltage (Al) [ [5]
330 V
Focusing Electrode Voltage (Al) [ 82.5to 155 165 to 310 330t0 620 | Volts
Focusing Electrode Voltage (Al) [ [6]
620 V
Focusing Electrode Voltage (Al) [ 82.5to 155 165 to 310 330t0 620 | Volts
Grid # [1]
1 V
Grid # 1 Voltage (Note 2) —14.5t0 —33.75 | —291to0 —67.5| —58 to —135| Volts
Grid # [2]
2 V
Grid # 1 Voltage (Note 2) —14.5t0 —33.75 | —291to0 —67.5| —58 to —135| Volts
Grid # [3]
-14.5 V
Grid # 1 Voltage (Note 2) —14.5t0 —33.75 | —291to0 —67.5| —58 to —135| Volts
Grid # [4]
-33.75 V
Grid # 1 Voltage (Note 2) —14.5t0 —33.75 | —291to0 —67.5| —58 to —135| Volts
Grid # [5]
-291 V
Grid # 1 Voltage (Note 2) —14.5t0 —33.75 | —291to0 —67.5| —58 to —135| Volts
Grid # [6]
-67.5 V
Grid # 1 Voltage (Note 2) —14.5t0 —33.75 | —291to0 —67.5| —58 to —135| Volts
Grid # [7]
-58 V
Grid # 1 Voltage (Note 2) —14.5t0 —33.75 | —291to0 —67.5| —58 to —135| Volts
Grid # [8]
-135 V
Grid # 1 Voltage (Note 2) —14.5t0 —33.75 | —291to0 —67.5| —58 to —135| Volts
Deflection Factor D1-D2 [1]
36.5 V
Deflection Factor D1-D2 36.5t049.5 73 t0 99 146 to 198 | Volts DC/Inch
Deflection Factor D1-D2 [2]
49.5 V
Deflection Factor D1-D2 36.5t049.5 73 t0 99 146 to 198 | Volts DC/Inch
Deflection Factor D1-D2 [3]
73 V
Deflection Factor D1-D2 36.5t049.5 73 t0 99 146 to 198 | Volts DC/Inch
Deflection Factor D1-D2 [4]
99 V
Deflection Factor D1-D2 36.5t049.5 73 t0 99 146 to 198 | Volts DC/Inch
Deflection Factor D1-D2 [5]
146 V
Deflection Factor D1-D2 36.5t049.5 73 t0 99 146 to 198 | Volts DC/Inch
Deflection Factor D1-D2 [6]
198 V
Deflection Factor D1-D2 36.5t049.5 73 t0 99 146 to 198 | Volts DC/Inch
Deflection Factor D3-D4 [1]
26 V
Deflection Factor D3-D4 26 to 35 52t0 70 104 to 140 | Volts DC/Inch
Deflection Factor D3-D4 [2]
35 V
Deflection Factor D3-D4 26 to 35 52t0 70 104 to 140 | Volts DC/Inch
Deflection Factor D3-D4 [3]
52 V
Deflection Factor D3-D4 26 to 35 52t0 70 104 to 140 | Volts DC/Inch
Deflection Factor D3-D4 [4]
70 V
Deflection Factor D3-D4 26 to 35 52t0 70 104 to 140 | Volts DC/Inch
Deflection Factor D3-D4 [5]
104 V
Deflection Factor D3-D4 26 to 35 52t0 70 104 to 140 | Volts DC/Inch
Deflection Factor D3-D4 [6]
140 V
Deflection Factor D3-D4 26 to 35 52t0 70 104 to 140 | Volts DC/Inch
Grid # [1]
1
Grid # 1 Circuit Resistance 1.5 Megohms
Grid # [2]
1.5
Grid # 1 Circuit Resistance 1.5 Megohms
Resistance in any Deflecting Electrode Circuit (Note [1]
3
Resistance in any Deflecting Electrode Circuit (Note 3) 1.0 Megohms
Resistance in any Deflecting Electrode Circuit (Note [2]
1
Resistance in any Deflecting Electrode Circuit (Note 3) 1.0 Megohms
Published value
1
1. With deflecting electrodes connected to Anode (A2).
Published value
2
2. For visual extinction of undeflected focused spot.
Published value
3
3. The resistance in each deflecting electrode circuit should be approximately equal.
' [1]
3 in
'3’(5"1 ALL DIMENSIONS IN INCHES
' [2]
5 in
'3’(5"1 ALL DIMENSIONS IN INCHES
' [3]
1 in
'3’(5"1 ALL DIMENSIONS IN INCHES
rescent, yellow phosphorescent, long persistence phosphor. Use of [1]
35
rescent, yellow phosphorescent, long persistence phosphor. Use of 35P7 at anode voltage below 1000
rescent, yellow phosphorescent, long persistence phosphor. Use of [2]
1000
rescent, yellow phosphorescent, long persistence phosphor. Use of 35P7 at anode voltage below 1000

Data set 03

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Focusing method
1 code
Electrostatic
Deflection method
1 code
Electrostatic
Deflection factor D1-D2 minimum
146 V/in
Deflection factor D1-D2 maximum
198 V/in
Deflection factor D3-D4 minimum
104 V/in
Deflection factor D3-D4 maximum
140 V/in
Useful screen / scan
1 code
1.5 x 3-inch rectangular direct-view screen
Phosphor designation
1 code
P2

Other

Anode No. 2 / accelerator voltage maximum
3000 V
Anode No. 2 / accelerator voltage
2000 V
Focusing electrode voltage maximum
1200 V
Focusing electrode voltage minimum
330 V
Focusing electrode voltage maximum
620 V
Grid No. 1 cutoff voltage minimum
-135 V
Grid No. 1 cutoff voltage maximum
-58 V
Peak heater-to-cathode voltage
140 V
Peak voltage between accelerator and any deflection plate
550 V
Grid No. 1 negative bias maximum
200 V