NJ7P SQL Tube Database Query

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25L6
Beam Power Amplifier

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 25W6
Substitutes ................................... 25C6
Source ........................................ RCA RC-13 1937

Application

Metal type used in output stage of ac/dc receivers. Requires octal socket and may be mountd in any position.

Mechanical Data

Bulb .......................................... MT-8
Base Type ..................................... Small Wafer Octal 7-Pin
EIA Outline ................................... 8-6
EIA Base ...................................... 7S
Mounting Position ............................. Any

Electrical Data

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

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 110 V
Grid No. 2 Voltage ............................ 110 V
Grid No. 1 Voltage ............................ -7.5 V
Peak Grid No. 1 Voltage........................ 7.5 V
Plate Resistance (approx) ..................... 10K Ω
Transconductance .............................. 8200 µ
Plate Current (Zero Signal) ................... 49 mA
Plate Current (Maximum Signal) ................ 54 mA
Grid No. 2 Current (Zero Signal) .............. 4 mA
Grid No. 2 Current (Maximum Signal) ........... 9 mA
Load Resistance ............................... 1.5K Ω
Power Output (approx) ......................... 2.1 W
Total Harmonic Distortion ..................... 11 %

Class A Amplifier
Plate Voltage ................................. 110 V
Grid No. 2 Voltage ............................ 110 V
Grid No. 1 Voltage ............................ -7.5 V
Peak Grid No. 1 Voltage........................ 7.5 V
Plate Resistance (approx) ..................... 10K Ω
Transconductance .............................. 8200 µ
Plate Current (Zero Signal) ................... 49 mA
Plate Current (Maximum Signal) ................ 50 mA
Grid No. 2 Current (Zero Signal) .............. 4 mA
Grid No. 2 Current (Maximum Signal) ........... 11 mA
Load Resistance ............................... 2K Ω
Power Output (approx) ......................... 2.2 W
Total Harmonic Distortion ..................... 10 %

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

Tue, 16 Aug 2022 08:45:48 -0700