NJ7P SQL Tube Database Query

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6939
Twin Power Pentode

EIA Base & Outline

Substitute Data

Substitutes ................................... 2E26
Source ........................................ RCA RC-29 - 1975

Application

Miniature type used in communications equipment as a push-pull rf power amplifier or frequency multiplier at frequencies up to 500 MHz. Requires miniature 9-contact socket. Plate dissipation is per tube.

Mechanical Data

EIA Outline ................................... 6-3
EIA Base ...................................... 9HL

Electrical Data

Heater Voltage ................................ 6.3/12.6 V
Heater Current ................................ 0.6/0.3 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 6.6 pf
Output ........................................ 1.6 pf
Grid to Plate ................................. 0.15 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 275 V
Grid No. 2 Voltage ............................ 200 V
Plate Dissipation ............................. 7.5 W
Grid No. 2 Dissipation ........................ 3 W

Characteristics and Typical Operation

Class C Amplifier
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -20 V
Grid No. 1 Current ............................ 2 mA
Plate Current ................................. 60 mA
Grid No. 2 Current ............................ 13 mA
Driving Power ................................. 1 W
Power Output (approx) ......................... 7.5 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 180 V
Grid No. 1 Voltage ............................ -20 V
Grid No. 1 Current ............................ 1.7 mA
Plate Current ................................. 55 mA
Grid No. 2 Current ............................ 11.5 mA
Driving Power ................................. 1 W
Power Output (approx) ......................... 6 W

Class C Multiplier (3X)
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 190 V
Grid No. 1 Voltage ............................ 68K V
Grid No. 1 Current ............................ 2.2 mA
Plate Current ................................. 46 mA
Grid No. 2 Current ............................ 10 mA
Driving Power ................................. 0.9 W

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, 06 Feb 2023 19:39:32 -0700