So as research is not wasted
For the archives , some high voltage, depletion type , n channel mosfet
type numbers
LND250
LND150
C633 , Teledyne
BSP135
BSS126
DN3135
DN3145
DN3545
DN2540
BSR58 , BSR56 ?

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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/