Mullard EF55 Pentode Valve
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EF55 VHF high slope pentode amplifier valve / vacuum tube by Mullard on a B9G base. This device was a further development of the famous EF50 and was designed for fairly substantial wide-band video output service, especially in early radar systems.
Heater = 6.3V @ 1.0A
Anode / Plate: 250V / 40mA / 55Kohm
Screen Grid: 250V / 5.5mA
Signal Grid: -4.5V