11-10-2017, 11:41 AM
I've rarely tried swapping Ge for Si either. There's no point, and there's enough to conspire against you at the best of times without adding new variables. Occasionally I'll try it on a set that is already working - purely as an experiment - and would agree that oscillators are fussy, but you might be OK with IF amplifiers.
My success rate with zapping AF11x transistors is practically 100%. No returns either. If I do it for a customer, I give a 5 year guarantee. But that's for Hackers, where the transistors are easy to get at. For a Roberts R707, I'd fit AF12x types.
In case the OP hasn't seen it, my article on radio transistors is here: http://www.markhennessy.co.uk/articles/v...istors.htm
My success rate with zapping AF11x transistors is practically 100%. No returns either. If I do it for a customer, I give a 5 year guarantee. But that's for Hackers, where the transistors are easy to get at. For a Roberts R707, I'd fit AF12x types.
In case the OP hasn't seen it, my article on radio transistors is here: http://www.markhennessy.co.uk/articles/v...istors.htm
