NJ7P SQL Tube Database Query

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12A5
Power Pentode

EIA Base & Outline

Application

Source ........................................ RCA DS 07/01/41
Glass type used as output amplifier in ac/dc radio receivers. Requires small seven-contact socket.

Mechanical Data

Source ........................................ RCA DS 07/01/41
Bulb .......................................... ST-12
Base Type ..................................... Small 7-Pin
EIA Outline ................................... 12-5
EIA Base ...................................... 7F
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA DS 07/01/41
Heater Voltage ................................ 6.3/12.6 V
Heater Current ................................ 0.6/0.3 A

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA DS 07/01/41
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 180 V
Plate Dissipation ............................. 8.25 W
Grid No. 2 Dissipation ........................ 2.5 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA DS 07/01/41
Plate Voltage ................................. 100 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -15 V
Peak Grid No. 1 Voltage........................ 15 V
Plate Resistance (approx) ..................... 50K Ω
Transconductance .............................. 1700 µ
Plate Current (Zero Signal) ................... 17 mA
Plate Current (Maximum Signal) ................ 19 mA
Grid No. 2 Current (Zero Signal) .............. 3 mA
Grid No. 2 Current (Maximum Signal) ........... 6.5 mA
Load Resistance ............................... 4500 Ω
Power Output (approx) ......................... 0.8 W
Total Harmonic Distortion ..................... 12 %

Class A Amplifier
Source ........................................ RCA DS 07/01/41
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 180 V
Grid No. 1 Voltage ............................ -25 V
Peak Grid No. 1 Voltage........................ 25 V
Plate Resistance (approx) ..................... 35K Ω
Transconductance .............................. 2400 µ
Plate Current (Zero Signal) ................... 45 mA
Plate Current (Maximum Signal) ................ 48 mA
Grid No. 2 Current (Zero Signal) .............. 8 mA
Grid No. 2 Current (Maximum Signal) ........... 14 mA
Load Resistance ............................... 3300 Ω
Power Output (approx) ......................... 3.4 W
Total Harmonic Distortion ..................... 1 %

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

Mon, 30 Jan 2023 00:40:41 -0700