EL34

EL34
An EL34 vacuum tube manufactured by Mullard
Classification	Pentode
Service	class-A amplifier, class-AB amplifier, class-B amplifier, (audio amplifiers)
Height	4.44 in (113 mm)
Diameter	1.5 in (38 mm)
Cathode
Cathode type	Indirectly heated
Heater voltage	6.3
Heater current	1.5 A
Anode
Max dissipation Watts	25
Max voltage	800
Socket connections
Typical class-A amplifier operation
Amplification factor	11
Anode voltage	265 V
Anode current	100 mA
Screen voltage	250 V
Bias voltage	−13.5 V
Anode resistance	2 k Ohms
Typical class-AB amplifier operation (Values are for two tubes)
Power output	55 W
Anode resistance: (anode to anode)	3.4 k Ohms
Anode voltage	420 V
Anode current	2* 120 mA
Screen voltage	375 V
Bias voltage	−38 V
References
Tung-Sol 6CA7 (EL34 Substitute) Vacuum Tube Logic Book 2nd Edition, 1994, page 151

The EL34 is a thermionic vacuum tube of the power pentode type. The EL34 was introduced in 1955 by Mullard, who were owned by Philips.^[1] The EL34 has an octal base (indicated by the '3' in the part number) and is found mainly in the final output stages of audio amplification circuits; it was also designed to be suitable as a series regulator by virtue of its high permissible voltage between heater and cathode and other parameters. The American RETMA tube designation number for this tube is 6CA7. The USSR analog was 6P27S (Cyrillic: 6П27C).