Thank you David and Onno
I have decoupled both Bypass and Tune buttons with 22nf (the only SMD caps I have) caps as close to the processor pins as possible and the tuner copes very well at 100w now.
Tuner faults were:
3 faulty caps (47, 470 and 1000pf)
2 faulty relay driver fets (affecting selection of the 1000pf cap and 0.05uH inductor)
1 faulty plated through hole
Open circuit on one of the bridge sense windings
Faulty or inadequate caps decoupling the bridge sense winding outputs (replaced with 22nf)
For a brand new ready constructed unit....pretty poor!
73 Steve G4EDG
