NJ7P SQL Tube Database Query

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3MP1
Electrostatic CRT

EIA Base & Outline

Mechanical Data

Source ........................................ Sylvania - 1959
Base Type ..................................... Small Shell Duodecal 12-Pin
Maximum Overall Height ........................ 8 In.
Maximum Diameter .............................. 3 In.
EIA Base ...................................... 12F
Mounting Position ............................. Any
Minimum Useful Screen Diameter ................ 2-3/4 In.
Bulb Contact .................................. Recessed Small Ball Cap (J1-22)

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
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
DC Component ............................ 140 V
Heater Negative with Respect to Cathode
DC Component ............................ 140 V

Direct Interelectrode Capacitances (approx)

Oscilloscope
Source ........................................ Sylvania - 1959
Cathode to All Other .......................... 2.2 pf
Grid to All Other ............................. 10.3 pf
Between D1 & D2 ............................... 1.3 pf
Between D3 & D4 ............................... 1.2 pf
D1 to All Others .............................. 4.4 pf
D3 to All Others .............................. 5.6 pf
D1 to All But D2 .............................. 5.0 pf
D2 to All But D1 .............................. 4.5 pf
D3 to All But D4 .............................. pf
D4 to All But D3 .............................. pf

Maximum Ratings (Design Center Values)

Oscilloscope
Source ........................................ Sylvania - 1959
Anode No. 2 Voltage ........................... 2750 V
Anode No. 1 Voltage ........................... 1100 V
Grid Voltage
Negative Bias Value ........................ 220 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 700 V
Grid No. 1 Voltage Required for Cutoff ........ 0 to -126 V
Deflection Factor
Deflecting Plates No. 1 & 2 ................... 230 to 290 V/In
Deflecting Plates No. 3 & 4 ................... 220 to 280 V/In

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

(c) 1994-2021 by William A. Beech, NJ7P

Mon, 15 Aug 2022 23:23:08 -0700