Marconiphone/Ferguson generic cross reference ?

[N_Cook]

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

 

[N_Cook]

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

 

[John Ferrier]

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

If my memory serves me well AC128 & AC127 complimentary push pull output

Regards
John.