NJ7P SQL Tube Database Query

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7189A
Power Pentode

EIA Base & Outline

Application

Miniature type used as power amplifier tube in high-fidelity audio equipment. Requires miniature 9-contact socket.

Mechanical Data

Bulb .......................................... T-6 1/2
Base Type ..................................... Miniature Button 9-Pin
EIA Outline ................................... 6-4
EIA Base ...................................... 9LE
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.76 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 10.8 pf
Output ........................................ 6.5 pf
Grid to Plate ................................. 0.5 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 300 V
Plate Dissipation ............................. 12 W
Grid No. 2 Dissipation ........................ 4 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -7.3 V
Plate Resistance (approx) ..................... 40K Ω
Transconductance .............................. 11.3K µ
Plate Current ................................. 48 mA
Grid No. 2 Current ............................ 5.5 mA

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -15 V
Peak Grid No. 1 Voltage........................ 21 V
Plate Current (Zero Signal) ................... 15 mA
Plate Current (Maximum Signal) ................ 105 mA
Grid No. 2 Current (Zero Signal) .............. 1.6 mA
Grid No. 2 Current (Maximum Signal) ........... 25 mA
Load Resistance ............................... 8K Ω
Power Output (approx) ......................... 24 W

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

Thu, 29 Sep 2022 23:38:04 -0700