Yes that sticker number has been posted elsewhere and found to be '79.
I posted the '77 schematic (with pull-boost) in the other thread and it should be close. Some of the extra stuff like 'line out', etc. (maybe 'matching' rather than bias?) you would have to look at late SF Twin or Super schematics to find.
Originally posted by Enzo
I have a sign in my shop that says, "Never think up reasons not to check something."
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