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Should be a 103-### on the part. Cross it to NTE. You can get
the specs that way.
73 Zeno
Its a 212-25, the other diodes are 103-###. A google search for "NTE 212-25" did return a "212-25 NTE Equivalent NTE116 1A 600V rectifier,
NTE116 General Purpose Silicon Rectifier 1A 600prv"
I will try 1N4007s. Thanks.