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8950
Beam Pentode

EIA Base & Outline

EIA Base: 8950EIA Bulb: 12-90
Source ........................................ GE DS 6-73

Application

Source ........................................ GE DS 6-73
The 8950 is a compactron beam power pentode primarily designed for RF power output applications. Features of the 8950 are dual cathode and grid connections for lower lead inductance and a 13.0 volt heater.

Source ........................................ GE DS 6-73
The 8950 is suitable for mobile and marine equipment applications havinf 12 volt battery supplies.

Mechanical Data

Source ........................................ GE DS 6-73
Bulb .......................................... T-12
Base Type ..................................... E12-74
EIA Outline ................................... 12-90
EIA Base ...................................... 8950
Top Cap ....................................... Small C1-1
Cathode ....................................... Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ GE DS 6-73
Heater Voltage ................................ 13.0 V
Heater Current ................................ 1.1 A
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
DC Component ............................ 100 V
Total DC and Peak ....................... 200 V
Heater Negative with Respect to Cathode
Total DC and Peak ....................... 200 V

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ GE DS 6-73
Input ......................................... 36 pf
Output ........................................ 18 pf
Grid to Plate ................................. 0.6 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ GE DS 6-73
Plate Voltage ................................. 800 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 250 V
Negative Grid No. 1 Voltage ................... 250 V
Plate Dissipation ............................. 33 W
Grid No. 2 Dissipation ........................ 5 W
Cathode Current ............................... 400 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 0.1M Ω
Self Bias .................................. Not Recommended Ω
Bulb Temperature (At Hottest Point) ........... 240 °C

Characteristics and Typical Operation

Pentode
Source ........................................ GE DS 6-73
Plate Voltage ................................. 175 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 110 V
Grid No. 1 Voltage ............................ -21 V
Transconductance .............................. 16000 µMho
Plate Current (Maximum Signal) ................ 120 mA
Grid No. 2 Current (Maximum Signal) ........... 2.0 mA
Grid No. 1 Voltage for Ib ..................... -42 µa @ 1000 V

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This database contains data on thousands of tubes. Every effort has been made to insure the accuracy of this reference, however, I assume no liability for the results of using information contained herein.

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

Sun, 26 Jun 2022 03:54:48 -0700