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Old 26th Jul 2020, 3:45 pm   #9
brian_mk
Tetrode
 
Join Date: Mar 2015
Location: Milton Keynes, Buckinghamshire, UK.
Posts: 91
Default Re: Marconi TF2431 Counter Service Manual / Schematic

An MBD102 schottky diode has a maximum reverse voltage rating of only 4V. That could explain the failure.
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