Any further word on an API-ish (discrete op-amp) pre? I'm interested in trying one with or without iron in the loop. I've looked at the schematics offered by Jensen and John Hardy, and it seems even more simple than the SC-1. I would hope they'd sound different even without the transformers, and awesomely different with the transformers.
(just having a bit of problems with justifying $100 a pop for JT-16-B trafos...)
Anyway, more SC-1s soon for me, just looking forward to starting to add more flavors for drums, elec. guitars, etc.
I've been busy these past few days... so no progress yet on that API-type preamp.
I got distracted by the DC-DC converter, and my new CNC setup... but I think I'll be able to go back to doing a final prototype for the IO-module and then start production run of the PCBs very soon... after the IO-module, the API-type pre will be next.
And yes, the API-ish circuit is very simple.
The flavor/sound mostly comes from the input transformer and the output transformer. Though maybe the discrete opamp contribute something too.
So if you don't have the exact model/part that API uses for the transformers, nobody can claim it's an API "clone"... but they can claim it's an API type circuit.
On a related note... the Sony MXP preamp circuit is almost like an API... except it used NE55xx opamps and no output transformer. I think alot of other companies also uses the same type of circuitry.... the difference mainly boils down to the model/type of input transformer, output transformer used, and opamp used.