NJ7P SQL Tube Database Query

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7754
Beam Power Pentode

EIA Base & Outline

Application

Miniature type used as an output amplifier in radios with low B-plus voltage. Requires miniature 9-contact socket. This is a larger bulb which allows better heat dissipation.

Mechanical Data

Bulb .......................................... T-9 Special
Base Type ..................................... Same as Miniature Button 9-Pin Except for Bulb Diameter
EIA Outline ................................... 6-70
Maximum Diameter .............................. 1-1/8 In.
EIA Base ...................................... 9MQ
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 1.2 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 14 pf
Output ........................................ 9 pf
Grid to Plate ................................. 0.75 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 150 V
Grid No. 2 Voltage ............................ 150 V
Plate Dissipation ............................. 16 W
Grid No. 2 Dissipation ........................ 2.5 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 140 V
Grid No. 2 Voltage ............................ 140 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 100 Ω
Plate Current (Zero Signal) ................... 100 mA
Plate Current (Maximum Signal) ................ 100 mA
Grid No. 2 Current (Zero Signal) .............. 5 mA
Grid No. 2 Current (Maximum Signal) ........... 14 mA
Load Resistance ............................... 1100 Ω
Power Output (approx) ......................... 4.5 W

Class A Amplifier
Plate Voltage ................................. 140 V
Grid No. 2 Voltage ............................ 140 V
Grid No. 1 Voltage ............................ -11.3 V
Plate Current (Zero Signal) ................... 100 mA
Plate Current (Maximum Signal) ................ 100 mA
Grid No. 2 Current (Zero Signal) .............. 5 mA
Grid No. 2 Current (Maximum Signal) ........... 14 mA
Load Resistance ............................... 1100 Ω
Power Output (approx) ......................... 4.5 W

Class A Amplifier
Plate Voltage ................................. 130 V
Grid No. 2 Voltage ............................ 130 V
Grid No. 1 Voltage ............................ -11 V
Plate Resistance (approx) ..................... 7000 Ω
Transconductance .............................. 11000 µ
Plate Current (Zero Signal) ................... 100 mA
Plate Current (Maximum Signal) ................ 108 mA
Grid No. 2 Current (Zero Signal) .............. 5 mA
Grid No. 2 Current (Maximum Signal) ........... 15 mA
Load Resistance ............................... 1100 Ω
Power Output (approx) ......................... 4.5 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 140 V
Grid No. 2 Voltage ............................ 140 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 50 Ω
Plate Current (Zero Signal) ................... 210 mA
Plate Current (Maximum Signal) ................ 210 mA
Grid No. 2 Current (Zero Signal) .............. 9 mA
Grid No. 2 Current (Maximum Signal) ........... 20 mA
Load Resistance ............................... 1500 Ω
Power Output (approx) ......................... 10 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 130 V
Grid No. 2 Voltage ............................ 130 V
Grid No. 1 Voltage ............................ -12 V
Plate Current (Zero Signal) ................... 195 mA
Plate Current (Maximum Signal) ................ 220 mA
Grid No. 2 Current (Zero Signal) .............. 9 mA
Grid No. 2 Current (Maximum Signal) ........... 24 mA
Load Resistance ............................... 1800 Ω
Power Output (approx) ......................... 10 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

Wed, 29 Mar 2023 02:13:04 -0700