Marconi Rectifier Indentification

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Original poster: "Gav D" <gdingley@xxxxxxxxx>

Hi,
I have a Marconi rectifier, two diodes in series to act as one half 
of a full-bridge circuit. The device takes the form of a black resin 
block with rounded ends measuring 7 3/4in. by 1 1/4in. by 1 1/4in. 
There are three imperial tapped terminals and the diodes have a 
forward voltage of 8.5V each. There is a label saying EHT Rectifier 
and are British made. The part number reads: HTZ 24B Does anyone have 
any data or may be able to guess their rating (voltage/current).

Thanks,

Gavin