ELECTRICAL Cathode... coated unipotential Heater Voltage Volts Heater Current
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1 Power Pentode The E34LS is a power pentode designed especially for high fidelity audio systems. It has a plate dissipation of 30 watts and delivers high power without drawing control-grid current. The E34LS features high efficiency with extremely low distortion. Great care is taken in manufacturing so that there is very little spread in characteristics of individual tubes. Thus, the rated output power can be obtained with all tubes. The tube also features high sensitivity which results in low distortion introduced by driver stages. The tube features a large plate dissipation reserve. The high allowable grid leak resistance improves the performance of preceeding stages. ELECTRICAL Cathode... coated unipotential Heater Voltage Heater Current Amps DIRECT INTERLECTRODE CAPACITANCES Grid No. 1 to all other elements except plate Plate to all other elements except grid No Plate to grid No Grid No. 1 to heater Heater to Cathode µµf µµf µµf max µµf max µµf MECHANICAL Base...JEDEC #8ET, octal, 8 pin Bulb... Tubular, 1 5/16" max. dia. Max. overall length /16 inch Max. seated height /8 inch Max. diameter /2 inch Mounting Position... any Revised 11/06/00 P E N T A L A B O R A T O R I E S 9740 COZYCROFT AVENUE * CHATSWORTH * CALIFORNIA (800) * (818) * FAX: (818) ELECTRON TUBES FOR INDUSTRY
2 MAXIMUM RATINGS - Design Center Values Plate Voltage Plate Voltage without plate current Plate Dissipation Plate Dissipation without input signal Grid No. 2 voltage Grid No. 2 voltage without plate current Grid No. 2 dissipation... 8 Cathode current Grid current starting point, Grid No. 1 voltage when grid No. 1 current is 0.3 µamp Grid No. 1 circuit resistance (class A and AB) Grid No. 1 circuit resistance (class B) External resistance between heater and cathode...20,000 Voltage between heater and cathode Watts Watts Watts ma megohm megohm Ohms OPERATING CHARACTERISTICS CLASS A, one tube Supply voltage Plate voltage Grid No. 2 series resistor Ohms Grid No. 3 voltage Grid No. 1 bias Plate current ma Grid No. 2 current ma Transconductance... 9,000 11,000 micromhos Amplification factor of grid No. 2 with respect to grid No Plate resistance... 18,000 15,000 Ohms Plate load resistance... 3,000 2,000 Ohms Input voltage (rms) Max. signal power output Watts Total harmonic distortion % Input voltage for power output of 50 m watts (rms) OPERATING CHARACTERISTICS CLASS B, two tubes Supply Voltage = 425 Common grid No. 2 resistor (without decoupling) Ohms Grid No. 1 bias Grid No. 3 voltage... 0 Input voltage (rms) Load resistance, plate to plate Ohms Supply voltage Plate voltage
3 Plate current... 2x30 2x120 2x100 ma Grid No. 2 current... 2x4.4 2x25 2x25 ma Max. signal, power output Watts Total harminic distortion % OPERATING CHARACTERISTICS CLASS B, two tubes Supply Voltage = 375 Common grid No. 2 resistor (without decoupling) Ohms Grid No. 1 bias Grid No. 3 voltage... 0 Input voltage (rms) Load resistance, plate to plate Ohms Supply voltage Plate voltage Plate current... 2x35 2x120 2x93 ma Grid No. 2 current... 2x4.7 2x25 2x25 ma Max. signal, power output Watts Total harminic distortion % OPERATING CHARACTERISTICS CLASS B, two tubes Supply Voltage = 500/400 Common grid No. 2 resistor (without decoupling) Ohms Grid No. 1 bias Grid No. 3 voltage... 0 Input voltage (rms) Load resistance, plate to plate Ohms Plate supply voltage Plate voltage Grid No. 2 supply voltage Plate current... 2x30 2x125 2x102 ma Grid No. 2 current... 2x4 2x25 2x25 ma Max. signal, power output Watts Total harminic distortion % OPERATING CHARACTERISTICS CLASS B, two tubes Supply Voltage = 800/400 Common grid No. 2 resistor (without decoupling) Ohms Grid No. 1 bias Grid No. 3 voltage... 0 Input voltage (rms) Load resistance, plate to plate ,000 11,000 Ohms Plate supply voltage Plate voltage
4 Grid No. 2 supply voltage Plate current... 2x25 2x91 2x84 ma Grid No. 2 current... 2x3 2x19 2x19 ma Max. signal, power output Watts Total harminic distortion % OPERATING CHARACTERISTICS CLASS AB, two tubes Supply Voltage = 375 Load resistance, plate to plate Ohms Common Grid No. 2 resistor Ohms Cathode resistor Ohms Grid No. 3 voltage... 0 Input voltage (rms) Supply voltage Plate voltage + voltage across cathode resistor Plate current... 2x75 2x95 ma Grid No. 2 current... 2x11.5 2x22.5 ma Max. signal, power output Watts Total harminic distortion % OPERATING CHARACTERISTICS IN TRIODE CONNECTION - Grid No. 2 connected to plate Class A, one tube, supply voltage 375 volts Supply voltage Grid No. 3 voltage...0 Cathode resistor Ohms Load resistance Ohms Input voltage (rms) Plate current ma Max. signal power output...6 Watts Total harmonic distortion... 8 % Input voltage for power output of 50 milliwatts (rms) OPERATING CHARACTERISTICS IN TRIODE CONNECTION - Grid No. 2 connected to plate Class A, two tube, supply voltage 400 volts Supply voltage Grid No. 3 voltage... 0 Cathode resistor Ohms Load resistance, plate to plate Ohms Input voltage (rms) Plate current... 2x65 2x71 ma Max. signal power output Watts Total harmonic distortion % 4
5 5
6 Plate Current - Milliamps Grid No.2 Current Plate Current Input A.C. Voltage Two E34LS Tubes in Class AB push-pull Supply Voltage = 375 Common Grid No.2 Resistor = 470 Ohms Common Cathode Resistor = 130 Ohms Load Resistance, plate to plate = 3400 Ohms Output - Watts Input A.C. Voltage -, rms Grid No.2 Current - Milliamps 6
7 Plate Current - Milliamps Distortion Input A.C. Voltage Plate Current One E34LS Tubes in Triode Connection Supply Voltage = 375 Cathode Resistor = 370 Ohms Load Resistance = 3000 Ohms Grid No.3 Voltage = 0 Input A.C. Voltage -, rms Distortion - Percent 7
8 Plate Current - Milliamps Grid No.2 Current Input A.C. Voltage Plate Current Two E34LS Tubes in Class B push-pull Plate Supply Voltage = 500 Grid No.2 Supply Voltage = 400 Grid No.1 Bias = -36 Common Grid No.2 Resistor = 750 Ohms Load Resistance, plate to plate = 4000 Ohms Grid No.3 Voltage = 0 Volt Output - Watts Input A.C. Voltage -, rms Grid No.2 Current - Milliamps 8
9 Plate Current - Milliamps Plate Dissipation Input A.C. Voltage Plate Current Two E34LS Tubes in Class B push-pull Plate Supply Voltage = 800 Grid No.2 Supply Voltage = 400 Grid No.1 Bias = -39 Common Grid No.2 Resistor = 750 Ohms Load Resistance, plate to plate = 11,000 Ohms Grid No.3 Voltage = 0 Volt Grid No.2 Current Output - Watts Input A.C. Voltage -, rms Grid No.2 Current - Milliamps Plate Dissipation - Watts 9
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