NJ7P SQL Tube Database Query

A horizontal ribbon.

Note: Please do not link down into my pages. I change this directory structure often and your links will not work correctly.

A horizontal ribbon.

25A7GT
Pentode & Half-Wave Recti

EIA Base & Outline

EIA Base: 8F
Source ........................................ RCA RC-15 - 1947

Application

Glass octal type used as combined half-wave rectifier and power amplifier. Requires octal socket.

Mechanical Data

Bulb .......................................... T-9
EIA Base ...................................... 8F

Electrical Data

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

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 100 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -15 V
Plate Resistance (approx) ..................... 50K Ω
Transconductance .............................. 1800 µMho
Plate Current ................................. 20.5 mA
Grid No. 2 Current ............................ 4 mA
Load Resistance ............................... 4.5K Ω
Power Output (approx) ......................... 0.77 W

A horizontal ribbon.

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.

Please enter the tube number:

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.

Other Tube Search Engines:
Frank's Electron Tube Pages

Complete Tube Manuals:
Tube Manual Index from NJ7P

A horizontal ribbon.

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

Sun, 26 Jun 2022 03:51:33 -0700