The USSA-3 was a solution to use jfet and lateral mosfet in an Zenotron/Pass F5 topology to obtain good audio performance (lower THD and greater DF). See circuit principle here:
Post your Solid State pics here.
Other way is also to use positive feedback as in the F7 from Pass.
Fab
Post your Solid State pics here.
Other way is also to use positive feedback as in the F7 from Pass.
Fab
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