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7868
Power Pentode

EIA Base & Outline

EIA Base: 9NZ
Source ........................................ RCA RC-29 - 1975

Application

Novar type used in output stages of high-fidelity audio amplifier. Requires vovar 9-contact socket.

Mechanical Data

EIA Base ...................................... 9NZ

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.8 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 11 pf
Output ........................................ 4.4 pf
Grid to Plate ................................. 0.15 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 550 V
Grid No. 2 Voltage ............................ 440 V
Plate Dissipation ............................. 19 W
Grid No. 2 Dissipation ........................ 3.3 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -10 V
Plate Resistance (approx) ..................... 29K Ω
Transconductance .............................. 10.2K µMho
Plate Current ................................. 75 mA
Grid No. 2 Current ............................ 15 mA
Load Resistance ............................... 3K Ω
Power Output (approx) ......................... 11 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -12.5 V
Peak Grid No. 1 Voltage........................ 25 V
Plate Current (Zero Signal) ................... 74 mA
Plate Current (Maximum Signal) ................ 116 mA
Grid No. 2 Current (Zero Signal) .............. 10 mA
Grid No. 2 Current (Maximum Signal) ........... 28 mA
Load Resistance ............................... 6.6K Ω
Power Output (approx) ......................... 24 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 350 V
Grid No. 2 Voltage ............................ 350 V
Grid No. 1 Voltage ............................ -15.5 V
Peak Grid No. 1 Voltage........................ 31 V
Plate Current (Zero Signal) ................... 72 mA
Plate Current (Maximum Signal) ................ 130 mA
Grid No. 2 Current (Zero Signal) .............. 9.5 mA
Grid No. 2 Current (Maximum Signal) ........... 32 mA
Load Resistance ............................... 6.6K Ω
Power Output (approx) ......................... 30 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 350 V
Grid No. 1 Voltage ............................ -16 V
Peak Grid No. 1 Voltage........................ 32 V
Plate Current (Zero Signal) ................... 64 mA
Plate Current (Maximum Signal) ................ 135 mA
Grid No. 2 Current (Zero Signal) .............. 8 mA
Grid No. 2 Current (Maximum Signal) ........... 28 mA
Load Resistance ............................... 6.6K 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 ............................ -16.5 V
Peak Grid No. 1 Voltage........................ 33 V
Plate Current (Zero Signal) ................... 60 mA
Plate Current (Maximum Signal) ................ 142 mA
Grid No. 2 Current (Zero Signal) .............. 7.2 mA
Grid No. 2 Current (Maximum Signal) ........... 26 mA
Load Resistance ............................... 6.6K Ω
Power Output (approx) ......................... 38 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 450 V
Grid No. 2 Voltage ............................ 400 V
Grid No. 1 Voltage ............................ -21 V
Peak Grid No. 1 Voltage........................ 42 V
Plate Current (Zero Signal) ................... 40 mA
Plate Current (Maximum Signal) ................ 145 mA
Grid No. 2 Current (Zero Signal) .............. 5 mA
Grid No. 2 Current (Maximum Signal) ........... 30 mA
Load Resistance ............................... 6.6K Ω
Power Output (approx) ......................... 44 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 450 V
Grid No. 2 Voltage ............................ 400 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 170 Ω
Peak Grid No. 1 Voltage........................ 31 V
Plate Current (Zero Signal) ................... 86 mA
Plate Current (Maximum Signal) ................ 94 mA
Grid No. 2 Current (Zero Signal) .............. 10 mA
Grid No. 2 Current (Maximum Signal) ........... 20 mA
Load Resistance ............................... 6.6K Ω
Power Output (approx) ......................... 28 W

Push Pull Class AB1 Amplifier (Triode Connected)
Plate Voltage ................................. 400 V
Grid No. 1 Voltage ............................ -20.5 V
Peak Grid No. 1 Voltage........................ 41 V
Plate Current (Zero Signal) ................... 60 mA
Plate Current (Maximum Signal) ................ 115 mA
Grid No. 2 Current (Zero Signal) .............. 8 mA
Grid No. 2 Current (Maximum Signal) ........... 18 mA
Load Resistance ............................... 6.6K Ω
Power Output (approx) ......................... 23 W

Push Pull Class AB1 Amplifier (Triode Connected)
Plate Voltage ................................. 425 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 185 Ω
Peak Grid No. 1 Voltage........................ 42 V
Plate Current (Zero Signal) ................... 88 mA
Plate Current (Maximum Signal) ................ 100 mA
Grid No. 2 Current (Zero Signal) .............. 12 mA
Grid No. 2 Current (Maximum Signal) ........... 16 mA
Load Resistance ............................... 6.6K Ω
Power Output (approx) ......................... 21 W

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Mon, 04 Jul 2022 16:46:37 -0700