NJ7P SQL Tube Database Query

A horizontal ribbon.

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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.

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A horizontal ribbon.

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Thu, 11 Aug 2022 13:43:24 -0700