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3BP1A
Electrostatic CRT

EIA Base & Outline

EIA Base: 14A
Source ........................................ Sylvania - 1959

Mechanical Data

Source ........................................ Sylvania - 1959
Base Type ..................................... Medium Shell Diheptal 12-Pin
Maximum Overall Height ........................ 10 In.
Maximum Diameter .............................. 3 In.
EIA Base ...................................... 14A
Minimum Useful Screen Diameter ................ 2-3/4 In.

General Data

Source ........................................ Sylvania - 1959
Focusing Method ............................... Sylvania - 1959
Deflecting Method ............................. Electrostatic
Deflecting Angle (approx) ..................... Electrostatic Deg.
Fluorescence ............................... P1
Phosphorescence ............................ Green
Faceplate ..................................... Medium

Electrical Data

Source ........................................ Sylvania - 1959
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.6 A

Direct Interelectrode Capacitances (approx)

Oscilloscope
Source ........................................ Sylvania - 1959
Cathode to All Other .......................... 8.0 pf
Grid to All Other ............................. 8.5 pf
Between D1 & D2 ............................... 2.0 pf
Between D3 & D4 ............................... 2.0 pf
D1 to All Others .............................. 8.0 pf
D3 to All Others .............................. 6.0 pf
D1 to All But D2 .............................. 6.0 pf
D2 to All But D1 .............................. 5.0 pf
D3 to All But D4 .............................. 4.0 pf
D4 to All But D3 .............................. 6.0 pf

Maximum Ratings (Design Center Values)

Oscilloscope
Source ........................................ Sylvania - 1959
Anode No. 2 Voltage ........................... 2200 V
Anode No. 1 Voltage ........................... 1100 V
Grid Voltage
Negative Bias Value ........................ 200 V
Positive Bias Voltage ...................... 0 V
Peak Voltage Between Anode No. 2 and
Any Deflection Plate ....................... 550 V
Grid Circuit Resistance ....................... 1.5M Ω
Deflection Circuit Resistance ................. 5.0M Ω

Characteristics and Typical Operation

Oscilloscope
Source ........................................ Sylvania - 1959
Anode No. 2 Voltage ........................... 2000 V
Anode No. 1 Voltage ........................... 400 to 690 V
Grid No. 1 Voltage Required for Cutoff ........ -30 to -90 V
Deflection Factor
Deflecting Plates No. 1 & 2 ................... 178 to 222 V/In
Deflecting Plates No. 3 & 4 ................... 118 to 178 V/In

Oscilloscope
Source ........................................ Sylvania - 1959
Anode No. 2 Voltage ........................... 1500 V
Anode No. 1 Voltage ........................... 430 V
Grid No. 1 Voltage Required for Cutoff ........ -45 V
Deflection Factor
Deflecting Plates No. 1 & 2 ................... 149 V/In
Deflecting Plates No. 3 & 4 ................... 149 V/In

Notes

Source ........................................ Sylvania - 1959
1. With D1 positive with respect to D2, the spot is deflected toward pin 5. With D3 positive with respect to D4, the spot is deflected toward pin 2.

2. Brillance and definition decrease with decreasing Anode No. 2 Voltage. In general, Anode No. 2 voltage should not be less than 1500 volts.

3. Visual extinction of undeflected spot.

4. Deflecting Plates 1-2 are nearer the screen.

5. Deflecting Plates 3-4 are nearer the base.

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Fri, 09 Dec 2022 06:56:26 -0700