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The Marconi MR10 is a double ended high voltage high vacuum half wave rectifier designed for transmitter applications. The connections are by screw terminals.
The anode connection is supported by a band around the glass tube and a flexible wire can be seen below the screw terminal. The anode is supported by four metal strips that fit into a clamp around the anode end pinch.
The filament connections are supported by a band around the end of the tube in the same way as the anode connection. Inside the two filament supports are held in the pinch.
A closer view of the stranded wire leading from the filament terminal posts to the pinch.
The filament is a single hairpin of tungsten wire. The mid point bend is held in a tension arm that connects to a clamp around a glass tube within a wider tube fixed to the side of the main balloon envelope. The wire around the clamp is joined to the spring wire just inside the bulb.
A closer view of the filament tension spring and the join to the side supports.
The Marconi logo, Type designation and made in England.
An enhanced image of the Marconi logo.
The evacuation pip on the bulb and within the ends of the filament are seen to be clamped into the ends of the supports.
The thin sheet anode with the four supports riveted to the cylinder. Within the thickness of the filament wire can be seen.
The balloon envelope is 180 mm in diameter and, including the base pins, is 540 mm tall.
References: Data-sheet.


Absolute Maximum Operating Conditions
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 19, 2021.
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