EL34 Vacuum Audio Power Tube Specs page 2

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