A diode, manufactured by Mullard, England, introduced in the late1920s and used as a full wave rectifier mainly in radio.

It had a 4.0 volt filament rating. Maximum R.M.S. plate voltage is 250V. It has a directly heated cathode.

Physical Description

Four pin European style base, with one pin cut off. The reason for this removal is that the valve has been used to replace a half wave rectifier with a three pin base, such as Philips 373.

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