NJ7P SQL Tube Database Query

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2E30
Beam Power Pentode

EIA Base & Outline

EIA Base: 7CQEIA Bulb: 5-3

Mechanical Data

EIA Outline ................................... 5-3
EIA Base ...................................... 7CQ

Electrical Data

Filament Voltage .............................. 6.0 V
Filament Current .............................. 0.65 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 10 pf
Output ........................................ 4.5 pf
Grid to Plate ................................. 0.5 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Plate Dissipation ............................. 10 W
Grid No. 2 Dissipation ........................ 2.5 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 450 Ω
Amplification Factor .......................... 40
Plate Resistance (approx) ..................... 63K Ω
Transconductance .............................. 3700 µMho
Plate Current ................................. 44 mA
Grid No. 2 Current (Zero Signal) .............. 3.3 mA
Grid No. 2 Current (Maximum Signal) ........... 7.4 mA
Load Resistance ............................... 4.5K Ω
Power Output (approx) ......................... 4.5 W

Push Pull Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 225 Ω
Amplification Factor .......................... 80
Plate Current ................................. 88 mA
Grid No. 2 Current (Zero Signal) .............. 6.6 mA
Grid No. 2 Current (Maximum Signal) ........... 14.8 mA
Load Resistance ............................... 9K Ω
Power Output (approx) ......................... 9 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -25 V
Amplification Factor .......................... 48
Plate Current ................................. 82 mA
Grid No. 2 Current (Zero Signal) .............. 3 mA
Grid No. 2 Current (Maximum Signal) ........... 13.5 mA
Load Resistance ............................... 8K Ω
Power Output (approx) ......................... 12.5 W

Push Pull Class AB2 Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -30 V
Amplification Factor .......................... 40
Plate Current ................................. 120 mA
Grid No. 2 Current (Zero Signal) .............. 4 mA
Grid No. 2 Current (Maximum Signal) ........... 20 mA
Load Resistance ............................... 3.8 Ω
Power Output (approx) ......................... 17 W

Class C Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -50 V
Grid No. 1 Current ............................ 2.5 mA
Plate Current ................................. 50 mA
Grid No. 2 Current ............................ 10 mA
Driving Power ................................. 0.2 W

Push Pull Class AB2 Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -30 V
Grid No. 1 Current ............................ 2.3 mA
Plate Current (Zero Signal) ................... 40 mA
Plate Current (Maximum Signal) ................ 120 mA
Grid No. 2 Current (Zero Signal) .............. 4 mA
Grid No. 2 Current (Maximum Signal) ........... 20 mA
Driving Power ................................. 0.2 W
Load Resistance ............................... 3.8K Ω
Power Output (approx) ......................... 17 W

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Tue, 28 Jun 2022 01:51:28 -0700