NJ7P SQL Tube Database Query

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7027A
Beam Power Pentode

EIA Base & Outline

Application

Glass octal type used in push-pull power amplifier circuits of high-fidelity audio equipment. Requires octal socket. This tube, like other power-handling tubes, should be adequately ventilated.

Mechanical Data

EIA Base ...................................... 8HY

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.9 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 10 pf
Output ........................................ 7.5 pf
Grid to Plate ................................. 1.5 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 500 V
Plate Dissipation ............................. 35 W
Grid No. 2 Dissipation ........................ 5 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -14 V
Plate Resistance (approx) ..................... 22.5K Ω
Transconductance .............................. 6000 µ
Plate Current ................................. 72 mA
Grid No. 2 Current ............................ 5 mA

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -25 V
Peak Grid No. 1 Voltage........................ 50 V
Plate Current (Zero Signal) ................... 102 mA
Plate Current (Maximum Signal) ................ 152 mA
Grid No. 2 Current (Zero Signal) .............. 6 mA
Grid No. 2 Current (Maximum Signal) ........... 17 mA
Load Resistance ............................... 6600 Ω
Power Output (approx) ......................... 34 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 450 V
Grid No. 2 Voltage ............................ 350 V
Grid No. 1 Voltage ............................ -30 V
Peak Grid No. 1 Voltage........................ 60 V
Plate Current (Zero Signal) ................... 95 mA
Plate Current (Maximum Signal) ................ 194 mA
Grid No. 2 Current (Zero Signal) .............. 3.4 mA
Grid No. 2 Current (Maximum Signal) ........... 19.2 mA
Load Resistance ............................... 6000 Ω
Power Output (approx) ......................... 50 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 540 V
Grid No. 2 Voltage ............................ 400 V
Grid No. 1 Voltage ............................ -38 V
Peak Grid No. 1 Voltage........................ 76 V
Plate Current (Zero Signal) ................... 100 mA
Plate Current (Maximum Signal) ................ 220 mA
Grid No. 2 Current (Zero Signal) .............. 5 mA
Grid No. 2 Current (Maximum Signal) ........... 21.4 mA
Load Resistance ............................... 6500 Ω
Power Output (approx) ......................... 76 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 200 Ω
Peak Grid No. 1 Voltage........................ 57 V
Plate Current (Zero Signal) ................... 112 mA
Plate Current (Maximum Signal) ................ 128 mA
Grid No. 2 Current (Zero Signal) .............. 7 mA
Grid No. 2 Current (Maximum Signal) ........... 16 mA
Load Resistance ............................... 6600 Ω
Power Output (approx) ......................... 32 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 380 V
Grid No. 2 Voltage ............................ 380 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 180 Ω
Peak Grid No. 1 Voltage........................ 68.5 V
Plate Current (Zero Signal) ................... 138 mA
Plate Current (Maximum Signal) ................ 170 mA
Grid No. 2 Current (Zero Signal) .............. 5.6 mA
Grid No. 2 Current (Maximum Signal) ........... 20 mA
Load Resistance ............................... 4500 Ω
Power Output (approx) ......................... 36 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 425 V
Grid No. 2 Voltage ............................ 415 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 200 Ω
Peak Grid No. 1 Voltage........................ 86 V
Plate Current (Zero Signal) ................... 150 mA
Plate Current (Maximum Signal) ................ 196 mA
Grid No. 2 Current (Zero Signal) .............. 8 mA
Grid No. 2 Current (Maximum Signal) ........... 20 mA
Load Resistance ............................... 3800 Ω
Power Output (approx) ......................... 44 W

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(c) 1994-2021 by William A. Beech, NJ7P

Tue, 28 Jun 2022 02:20:03 -0700