NJ7P SQL Tube Database Query

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4HC7
Twin Triode

EIA Base & Outline

Substitute Data

Substitutes ................................... 4HA7
Source ........................................ RCA RC-29 - 1975

Mechanical Data

Source ........................................ RCA RC-29 - 1975
Bulb .......................................... T-9
EIA Outline ................................... 9-57
EIA Base ...................................... 12FR

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 4.2 V
Heater Current ................................ 0.6 A

Characteristics and Typical Operation

Triode 1 Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 150 V
Grid No. 1 Voltage ............................ -1 V
Amplification Factor .......................... 23
Plate Resistance (approx) ..................... 5200 Ω
Transconductance .............................. 4400 µ
Plate Current ................................. 18 mA

Triode 2 Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 150 V
Grid No. 1 Voltage ............................ -1 V
Amplification Factor .......................... 100
Plate Resistance (approx) ..................... 5300 Ω
Transconductance .............................. 1900 µ
Plate Current ................................. 1 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

Tue, 21 Mar 2023 05:06:29 -0700