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Vacuum Tube Data Sheets
6CA7 / EL34
Operating Characteristics Class AB, two tubes 
Supply voltage 375 volts 
Load resistance, plate to plate 
3400 
ohms 
Common grid No. 2 resistor 
470 
ohms 
Cathode resistor 
130 
ohms 
Grid No. 3 voltage 
0 
volt 


Input voltage 
0 
21 volts (rms) 
Supply voltage 
375 
375 volts 
Plate voltage + voltage across cathode resistor 
355 
350 volts 
Plate current 
2 x 75 
2 x 95 ma 
Grid No. 2 current 
2 x 11.5 
2 x 22.5 ma 
Max. signal power output 
0 
35 watts 
Total harmonic distortion 
___ 
5 percent 
Operating Characteristics in Triode Connection 
(Grid No. 2 connected to plate) 
Class A, one tube, supply voltage 375 volts 
Supply voltage 
375 volts 
Grid No. 3 voltage 
0 volt 
Cathode resistor 
370 ohms 
Load resistance 
3000 ohms 
Input voltage 
18.9 volts (rms) 
Plate current 
70 ma 
Max. signal power output 
6 watts 
Total harmonic distortion 
8 percent 
Input voltage for power output of 50 milliwatts 
1.7 volts (rms) 
Operating Characteristics in Triode Connection 
(Grid No. 2 connected to plate) 
Class AB, two tubes, supply voltage 400 volts 
Supply voltage 
400 
volts 
Grid No. 3 voltage 
0 
volt 
Cathode resistor 
220 
ohms 
Load resistance, plate to plate 
5000 
ohms 


Input voltage 
0 
22 volts (rms) 
Plate current 
2 x 65 
2 x 71 ma 
Max. signal power output 
0 
16.5 watts 
Total harmonic distortion 
___ 
3 percent 
Vacuum Tube Data Sheets
