12-06-2013, 02:13 PM
Looking at the third one more closely I suspect it would use OC44 & OC45 transistors as there appear to be pads for the feedback/neutralising components in the IF stages. It also looks to have the audio amplifier stages but it's difficult to see if it's a transformer coupled amp or is a complementary pair. Any way it looks like an early 60s design.
The 4th one has a silicon transistor so I would suspect that as being a 70s design.
All the boards look as if they have been laid out by hand, none of this modern CAD stuff used back then.
Keith
The 4th one has a silicon transistor so I would suspect that as being a 70s design.
All the boards look as if they have been laid out by hand, none of this modern CAD stuff used back then.
Keith







