Type | Substitutes | Base Diagram |
---|---|---|
KT77 | 6CA7 | |
Web References | KT77 (GEC) @ Franks Electron Tubes KT77 (M-O Valve) @ Franks Electron Tubes KT77 (JJ) @ Franks Electron Tubes |
Bulb | Special, straight |
Base | Metal Octal 8-Pin |
Basing | 8ET |
Cathode | Coated Unipotential |
Mounting Position | Vertical preferred. |
Filament Voltage (AC) | 5.0 | Volts |
Filament Current | 1.5 | Amps |
Grid No. 1 to Plate | 1.0 | ��f |
Input | 15.5 | ��f |
Output | 7.2 | ��f |
Plate Voltage | 500 | Volts |
Plate Dissipation | 30 | Watts |
Grid No. 1 Cathode Bias Resistance | 0.71 | Megohm |
Plate Voltage | 800 | Volts |
Grid No. 2 Voltage | 425 | Volts |
Plate Dissipation | 25 | Watts |
Grid No. 2 Dissipation | 8.0 | Watts |
Cathode Current | 150 | Ma |
Grid No. 1 Cathode Bias Resistance | 0.72 | Megohm |
Plate Voltage | 400 | Volts |
Cathode Resistor | 220 | Ohms |
Zero Signal Plate Current | 130 | Ma |
Max. Signal Plate Current | 142 | Ma |
Load Resistance | 5000 | Ohms |
Power Output | 16.5 | Watts |
Total Harmonic Distortion | 3 | Percent |
Plate Voltage | 265 | 300 | Volts |
Grid No. 2 Voltage | 250 | 300 | Volts |
Cathode Resistor |   | 190 | Ohms |
Grid No. 1 Voltage | -13.5 |   | Volts |
Zero Signal Plate Current | 100 | 83 | Ma |
Transconductance | 11000 | 11000 | �mhos |
Plate Resistance | 2000 | 3500 | Ohms |
Power Output | 11 | 11 | Watts |
Total Harmonic Distortion | 10 | 10 | Percent |
Plate Voltage | 375 | 450 | 400 | Volts |
Grid No. 2 Voltage | 375 | 450 | 400 | Volts |
Grid NO. 2 Resistor | 470 | 1000 | 800 | Ohms |
Grid No. 1 Voltage |   |   | -36 | Volts |
Cathode Resistor | 130 | 232 |   | Ohms |
A-F Grid Voltage (RMS) | 20 | 27 | 25 | Volts |
Zero Signal Plate Current | 150 | 120 | 60 | Ma |
Max. Signal Plate Current | 188 | 143 | 221 | Ma |
Zero Signal Grid No. 2 Current | 25 | 20 | 9 | Ma |
Max. Signal Grid NO. 2 Current | 39 | 44 | 46 | Ma |
Load Resistance (P to P) | 3500 | 6500 | 3500 | Ohms |
Power Output | 35 | 40 | 54 | Watts |
Total Harmonic Distortion | 1.7 | 5.1 | 1.6 | Percent |
Plate Voltage | 430 | 430 | Volts |
Cathode Resistor | 235 | 235 | Ohms |
A-F Grid Voltage (RMS) | 17.5 | 25 | Volts |
Zero Signal Plate Current | 125 | 125 | Ma |
Max. Signal Plate Current | 130 | 140 | Ma |
Zero Signal Grid No. 2 Current | 20 | 20 | Ma |
Max. Signal Grid NO. 2 Current | 20.4 | 28 | Ma |
Load Resistance (P to P) | 6000 | 6000 | Ohms |
Power Output | 20 | 34 | Watts |
Total Harmonic Distortion | 0.35 | 2.5 | Percent |
1 | The maximum permissible limit for Grid No. 1 Resistor in a Class B Circuit is 0.5 Megohms. |
2 | Grid No. 2 at 43% of Primary Winding. |