Studer A101

[microstrip]

I can find at less three versions of this hybrid IC - one with a large round blog (capacitor?) encapsulated in light blue epoxy, another with a square thin capacitor, also encapsulated in light blue epoxy and finally a non encapsulated board using bc550c and bc560c transistors.
Which do you think it is the better sounding?
 

[traf]

The better sounding is none of those as they use obsolete discrete components and a tantalum cap. Among the three, the latter version, with the larger capacitor, not epoxy-covered is better, but still way below potential.
PM me if you are interested in a better custom version.
Tod