Trying to understand the output stage, I have tried simulating the two triples as complementary sets and find that the npn-pnp-npn and pnp-npn-pnp arrangement is much worse behaved than the pnp-npn-npn and npn-pnp-pnp
The second arrangement, left hand side of the schematic has a lot less hard switching and high order distortion.
The original 303 used both structures to get away with an all npn output stage, but it was unbalanced with significant 2nd harmonic before feedback
The second arrangement, left hand side of the schematic has a lot less hard switching and high order distortion.
The original 303 used both structures to get away with an all npn output stage, but it was unbalanced with significant 2nd harmonic before feedback
