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but possibly have a listing of arts that could be swapped out (IC, Op-Amps, transformers, etc....). There are a lot of tweakheads that would love to try adding some different flavors - and if you give them a listing it might be helpful.
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I've tried the preamp with THAT 1510 and THAT 1512 chips. For the balanced line driver (using THAT OutSmarts Chips), I've tried it with THAT 1646 and THAT 1606 chips. All good.
http://thatcorp.com/datashts/OutSmartsComp.pdf
I have not tried SSM compatible chips with this preamp, but if they're 8 pin DIP, I don't see why they shouldn't work. Personally, I haven't tried them since I don't have any laying around.
For the trafo, I've tried them using Edcor 600:600 output trafos. The 1646 are robust enough to drive 600ohm transformers, so no problems there. You can also try Cinemag, Lundahl, Jensen, St. Ives, Carnhill, Sowter, etc... as long as they're 600 impedance transformers.