In article , Eiron
wrote:


How strict are the negative feedback rules? I presume a Darlington pair
or triple is allowed but if I use a triplet of NPN/PNP/NPN or even an
NPN/PNP pair then someone is going to argue that it has a load of
negative feedback even though it behaves like a high gain transistor in
emitter-follower mode.

This thread did make me wonder if it might be interesting to try making a
power amp with 'one device' - e.g. a SAP15. :-)

There should be some design parameters set before I raid my junk box. To
make it fair for the valvies, perhaps I should only use germanium
transistors. :-)

Don't use AL102's. 8-]

....although if you find any that have survived so long, they're probably
the reliable ones, so should be OK. :-)

Slainte,

Jim

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