Note: Please do not link down into my pages. I change this directory structure often and your links will not work correctly.
![]() |
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.
Source ........................................ Sylvania - 1959
Focusing Method ............................... Sylvania - 1959
Deflecting Method ............................. Electrostatic
Deflecting Angle (approx) ..................... Electrostatic Deg.
Fluorescence ............................... P1
Phosphorescence ............................ Green
Faceplate ..................................... Medium
Source ........................................ Sylvania - 1959
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.6 A
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
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
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
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.
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
Sat, 02 Jul 2022 23:42:54 -0700