NJ7P SQL Tube Database Query

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12B8GT
High-Mu Triode - Remote-Cutoff Pentode

EIA Base & Outline

Application

Source ........................................ RCA RC-15 - 1947
Glass octal type used as combined detector and rf or if amplifier in ac/dc receivers. Requires octal socket.

Mechanical Data

Source ........................................ RCA RC-15 - 1947
Bulb .......................................... T-9
EIA Base ...................................... 8T

Electrical Data

Source ........................................ RCA RC-15 - 1947
Heater Voltage ................................ 12.6 V
Heater Current ................................ 0.3 A

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 90 V
Grid No. 1 Voltage ............................ 0 V
Amplification Factor .......................... 90
Plate Resistance (approx) ..................... 37000 Ω
Transconductance .............................. 2400 µ
Plate Current ................................. 2.8 mA

Pentode Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 90 V
Grid No. 2 Voltage ............................ 90 V
Grid No. 1 Voltage ............................ -3 V
Plate Resistance (approx) ..................... 200K Ω
Transconductance .............................. 1800 µ
Plate Current ................................. 7 mA
Grid No. 2 Current ............................ 2 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

Sat, 25 Jun 2022 09:20:13 -0700