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Old 23rd Oct 2019, 11:27 am   #2
Michael Maurice
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Join Date: Feb 2006
Location: Wembley, Middlesex
Posts: 6,176
Default Re: Revox A700 End of tape sensor

The diode mentioned in the manual is MRD148. They don't appear to be available anywhere even Ebay doesn't list them.

I cannot see why you couldn't use any opto transistor. Cricklewood stock SFH 206 which could work, or BPW48N.

Before you do so, check that R69 hasn't disintegrated and C8 hasn't gone short circuit. Also check Q1 by substitution.
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