it was not Q3, but its simetric transistor Q10
leaking from collector to emiter, replaced Q10
with a mpsa92 transistor, and the amp is ok now.
thank you very much, Ill be donating
assistance is not authorized by Stetsom then I'm put here in Brazil allowed the pics of Stetsom 2k5/2k6 modules / 4K2 / 3k7 / 5k2 are the same as the pic and the referecia v2kk1kx R2D