of 1970s transistors eg I found related crosses for AF2 = BC109, AF6 = BC107 but what is OP1A, PNP, audio power transistor and its complement OP1B
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on
Some BRC / Marconiphone / Ferguson generic cross references as the info does not seem to be out there. Late 1960s / 1970s transistors, from a few Newnes books, some duplication it would seem in lower spec uses AF1 = BF187 AF2 = BC109 AF4 = BFY52 AF6 = BC107 AF8 = AC128 AF11 = BC186 AF13 = BC186
OP1A = OP2A = AC128 OP1B = OP2B = AC176
RF7 = BF194
Some complementary pairings of the time AC142, AC141 AC154, AC157 AC188, AC187 AD162, AD161 AC186, AC131 AC153, AC176
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on
If my memory serves me well AC128 & AC127 complimentary push pull output
Regards John.
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