NJ7P SQL Tube Database Query

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25B6G
Power Amplifier Pentode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 25C6
Source ........................................ RCA RC-15 - 1947

Application

Glass octal type used in output stage of ac/dc receivers. Requires octal socket.

Mechanical Data

Bulb .......................................... ST-14
EIA Outline ................................... 14-3 9-11 9-41
EIA Base ...................................... 7S

Electrical Data

Heater Voltage ................................ 25 V
Heater Current ................................ 0.3 A

Maximum Ratings (Design Center Values)

Plate Dissipation ............................. 200 W
Grid No. 2 Dissipation ........................ 135 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 135 V
Grid No. 1 Voltage ............................ 023 V
Plate Resistance (approx) ..................... 18K Ω
Transconductance .............................. 5000 µ
Plate Current ................................. 62 mA
Grid No. 2 Current ............................ 1.8 mA
Load Resistance ............................... 2.5K Ω
Power Output (approx) ......................... 7.1 W

Class A Amplifier
Plate Voltage ................................. 95 V
Grid No. 2 Voltage ............................ 95 V
Grid No. 1 Voltage ............................ -15 V
Plate Current ................................. 45 mA

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

Wed, 29 Mar 2023 06:36:41 -0700