Your square wave sounds so nice with J201Sokkan wrote:
The second tests I did was with full resonance because phono asked for them:
http://www.bahnhof.se/wb447909/phono/x0 ... xTest2.zip
Can you tell exactly which J201 do you use ? 2SJ201 / J201-D27Z / J201-D74Z ???
I have the 2SK30A0. Is it the original component of the TB-303 ? Better than J201 ?