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EL34

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. Wikipedia
Heater current: 1.5 A
Diameter: 1.5 in (38 mm)
Heater voltage: 6.3
Max dissipation Watts: 25
Max voltage: 800