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6550
Power Pentode

EIA Base & Outline

EIA Base: 7S
Source ........................................ RCA RC-29 - 1975

Application

Glass octal type used in the output stages of high-fidelity audio amplifiers. Requires octal socket.

Mechanical Data

Bulb .......................................... ST-16
Base Type ..................................... Large Wafer Octal 8-Pin Mica with Metal Sleeve
Maximum Overall Height ........................ 4-3/4 In.
Maximum Seated Height ......................... 4-3/16 In.
Maximum Diameter .............................. 2-1/16 In.
EIA Base ...................................... 7S
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 1.6 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 14 pf
Output ........................................ 12 pf
Grid to Plate ................................. 0.85 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 400 V
Plate Dissipation ............................. 35 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 225 V
Grid No. 1 Voltage ............................ -16.5 V
Plate Resistance (approx) ..................... 27K Ω
Transconductance .............................. 9000 µMho
Plate Current (Zero Signal) ................... 87 mA
Plate Current (Maximum Signal) ................ 105 mA
Grid No. 2 Current (Zero Signal) .............. 4 mA
Grid No. 2 Current (Maximum Signal) ........... 18 mA
Grid No. 1 Voltage for Ib ..................... 1000 µa @ -35 V
Load Resistance ............................... 3K Ω
Power Output (approx) ......................... 20 W
Total Harmonic Distortion ..................... 13.5 %

Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -14 V
Plate Resistance (approx) ..................... 12K Ω
Transconductance .............................. 11000 µMho
Plate Current (Zero Signal) ................... 140 mA
Plate Current (Maximum Signal) ................ 150 mA
Grid No. 2 Current (Zero Signal) .............. 12 mA
Grid No. 2 Current (Maximum Signal) ........... 28 mA
Grid No. 1 Voltage for Ib ..................... 1000 µa @ -40 V
Load Resistance ............................... 1500 Ω
Power Output (approx) ......................... 12.5 W
Total Harmonic Distortion ..................... 7 %

Push Pull Class A Amplifier
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 275 V
Grid No. 1 Voltage ............................ -25 V
Plate Current (Zero Signal) ................... 180 mA
Plate Current (Maximum Signal) ................ 270 mA
Grid No. 2 Current (Zero Signal) .............. 9 mA
Grid No. 2 Current (Maximum Signal) ........... 44 mA
Load Resistance ............................... 3500 Ω
Power Output (approx) ......................... 55 W

Push Pull Class A Amplifier
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -33 V
Plate Current (Zero Signal) ................... 100 mA
Plate Current (Maximum Signal) ................ 280 mA
Grid No. 2 Current (Zero Signal) .............. 3 mA
Grid No. 2 Current (Maximum Signal) ........... 33 mA
Load Resistance ............................... 5000 Ω
Power Output (approx) ......................... 100 W

Push Pull Class A Amplifier
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 140 Ω
Plate Current (Zero Signal) ................... 166 mA
Plate Current (Maximum Signal) ................ 190 mA
Grid No. 2 Current (Zero Signal) .............. 7.5 mA
Grid No. 2 Current (Maximum Signal) ........... 39 mA
Load Resistance ............................... 4500 Ω
Power Output (approx) ......................... 41 W

Push Pull Class A Amplifier (Triode Connected)
Plate Voltage ................................. 450 V
Grid No. 2 Voltage ............................ 450 V
Grid No. 1 Voltage ............................ -46 V
Plate Current (Zero Signal) ................... 150 mA
Plate Current (Maximum Signal) ................ 220 mA
Load Resistance ............................... 4000 Ω
Power Output (approx) ......................... 28 W
Total Harmonic Distortion ..................... 2.5 %

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 140 Ω
Peak Grid No. 1 Voltage........................ 20 V
Plate Current (Zero Signal) ................... 166 mA
Plate Current (Maximum Signal) ................ 190 mA
Grid No. 2 Current (Zero Signal) .............. 7.5 mA
Grid No. 2 Current (Maximum Signal) ........... 39 mA
Load Resistance ............................... 4500 Ω
Power Output (approx) ......................... 41 W
Total Harmonic Distortion ..................... 4 %

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 275 V
Grid No. 1 Voltage ............................ -23 V
Peak Grid No. 1 Voltage........................ 17 V
Plate Current (Zero Signal) ................... 180 mA
Plate Current (Maximum Signal) ................ 270 mA
Grid No. 2 Current (Zero Signal) .............. 9 mA
Grid No. 2 Current (Maximum Signal) ........... 44 mA
Load Resistance ............................... 3500 Ω
Power Output (approx) ......................... 55 W
Total Harmonic Distortion ..................... 3 %

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -16.5 V
Peak Grid No. 1 Voltage........................ 23 V
Plate Current (Zero Signal) ................... 115 mA
Plate Current (Maximum Signal) ................ 273 mA
Grid No. 2 Current (Zero Signal) .............. 4 mA
Grid No. 2 Current (Maximum Signal) ........... 41 mA
Load Resistance ............................... 5000 Ω
Power Output (approx) ......................... 100 W
Total Harmonic Distortion ..................... 2.5 %

Push Pull Class AB1 Amplifier (Ultra-Linear)
Plate Voltage ................................. 450 V
Grid No. 3 Voltage ............................ 43% of Primary Winding V
Grid No. 2 Voltage ............................ 450 V
Grid No. 1 Voltage ............................ -48 V
Peak Grid No. 1 Voltage........................ 35.5 V
Plate Current ................................. 150 mA
Load Resistance ............................... 3300 Ω
Power Output (approx) ......................... 70 W
Total Harmonic Distortion ..................... 2.5 %

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Thu, 18 Aug 2022 19:21:11 -0700