Vacuum Tube Data Sheets

6CA7 / EL34

MAXIMUM RATINGS (Design Center Values)
Plate voltage 800 volts
Plate voltage without plate current 2000 volts
Plate dissipation 27.5 watts
Plate dissipation without input signal 25 watts
Grid No. 2 voltage 425 volts
Grid No. 2 voltage without place current 800 volts
Grid No. 2 dissipation 8 watts
Cathode current 150 ma
Grid current starting point.  Grid No. 1 voltage when
   grid No. 1 current is 0.3 u amp
1.3 volts
Grid No. 1 circuit resistance (class A and AB) 0.7 megohm
Grid No. 1 circuit resistance (class B) 0.5 megohm
External resistance between heater and cathode 20,000 ohms
Voltage between heater and cathode 100 volts

 

Operating Characteristics Class A, one tube

Supply voltage 265 265 volts
Plate voltage 250 250 volts
Grid No. 2 series resistor 2000 0 ohms
Grid No. 3 voltage 0 0 volt
Grid No.1 bias -14.5 -13.5 volts
Plate current 70 100 ma
Grid No. 2 current 10 15 ma
Transconductance 9,000 11,000 micromhos
Amplification factor of grid No. 2 with respect
   to grid No. 1
11 11
Plate resistance 18,000 15,000 ohms
Plate load resistance 3,000 2,000 ohms
Input voltage 9.3 8.7 volts (rms)
Max. signal power output 8 11 watts
Total harmonic distortion 10 10 percent
Input voltage for power output of 50 m watts 0.65 0.5 volt (rms)

 

Operating Characteristics Class B, two tubes
Supply voltage 425 volts
Common grid No. 2 resistor (without decoupling) 1000 ohms
Grid No. 1 bias -38 volts
Grid No. 3 voltage 0 volts
Input voltage 0 27 27 volts (rms)
Load resistance, plate to plate ___ 3400 4000 ohms
Supply voltage 425 425 400 volts
Plate voltage 420 400 375 volts
Plate current 2 x 30 2 x 120 2 x 100 ma
Grid No. 2 current 2 x 4.4 2 x 25 2 x 25 ma
Max. signal, power output 0 55 45 watts
Total harmonic distortion ___ 5 6 percent

 

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