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.

25B8GT
High-Mu Triode - Remote-Cutoff Pentode

EIA Base & Outline

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

Application

Glass octal type used as amplifier. Requires octal socket.

Mechanical Data

EIA Base ...................................... 8T

Electrical Data

Heater Voltage ................................ 25 V
Heater Current ................................ 0.15 A

Characteristics and Typical Operation

Pentode Class A Amplifier
Plate Voltage ................................. 100 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -3 V
Plate Resistance (approx) ..................... 185K Ω
Transconductance .............................. 2000 µMho
Plate Current ................................. 7.6 mA
Grid No. 2 Current ............................ 2 mA

Triode Class A Amplifier
Plate Voltage ................................. 100 V
Grid No. 1 Voltage ............................ -1 V
Plate Resistance (approx) ..................... 75K Ω
Transconductance .............................. 1500 µMho
Plate Current ................................. 0.6 mA

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

Sat, 25 Jun 2022 15:41:47 -0700