NJ7P SQL Tube Database Query

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7199
Sharp-Cutoff Pentode-Medium-Mu Triode

EIA Base & Outline

Application

Miniature type used in high-quality, high-fidelity audio equipment, particularly in phase splitters, tone-control amplifiers, and high-gain voltage amplifiers. Requires miniature 9-contact socket.

In direct-coupled voltage-amplifier phase-splitter circuits, the pentode unit should drive the triode unit.

Mechanical Data

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

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.45 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 5 pf
Output ........................................ 2 pf
Grid to Plate ................................. 0.06 pf

Triode
Input ......................................... 2.3 pf
Output ........................................ 0.3 pf
Grid to Plate ................................. 2 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 330 V
Plate Dissipation ............................. 3 W
Grid No. 2 Dissipation ........................ 0.6 W

Triode
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 2.4 W

Characteristics and Typical Operation

Pentode Class A Amplifier
Plate Voltage ................................. 100 V
Grid No. 2 Voltage ............................ 50 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 1000 Ω
Plate Resistance (approx) ..................... 1M Ω
Transconductance .............................. 1500 µ
Plate Current ................................. 1.1 mA
Grid No. 2 Current ............................ 0.35 mA

Pentode Class A Amplifier
Plate Voltage ................................. 220 V
Grid No. 2 Voltage ............................ 130 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 62 Ω
Plate Resistance (approx) ..................... 400K Ω
Transconductance .............................. 7000 µ
Plate Current ................................. 12.5 mA
Grid No. 2 Current ............................ 3.5 mA

Triode Class A Amplifier
Plate Voltage ................................. 215 V
Grid No. 1 Voltage ............................ -8.5 V
Amplification Factor .......................... 17
Plate Resistance (approx) ..................... 8.1K Ω
Transconductance .............................. 2100 µ
Plate Current ................................. 9 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

Thu, 02 Feb 2023 04:30:50 -0700