Hi Tony,

Well, the original toroidal transformer was replaced by an unknown 'technician' with one that has not the same voltage outputs.

(Original transformer says : 1 x 12V, 2 x 16.2V The replacement one measures 1 x 16 and 2 x 14.6 V AC while active in circuit)

On top of that he messed up the wiring and I'm afraid he connected ground-wiring to the secondary AC circuit. Now there is a HUGE humming noise and I want to get rid of this.

In fact I would like to know how the transformer should be connected on terminals 1 - 8 on the PC board (CN1)