where to start? we've had a quick look , replaced fuse (which was actually 1A ) above voltage dial with a proper rated 1.6A but that blew straight away

what's the commonest cause  for fuses blowing in these pls?

 would it be the big heavy metal thing in the middle perchance?

Rich

A good place to start would be to isolate the rectifier from the transformer secondary and
see if the fuse still blows.
If it does - the transformer or power switch is at fault.
If not - the rectifier or something drastic around the voltage regulators and/or amplifiers has gone wrong.
The capacitors on the regulator module PCB are causing many strange faults. A cap kit is available but
check the rectifier/transformer etc. first.

Martin

many thanks , as always Martin.

I disconnected everything downstream from transformer I think ...

i.e 2 black wires disappear into voltage dial (rectifier?) and come out and feed into 1.6A fuses before entering(transformer?) via numerous waxed red & green cloth covered wires.

More wires come out from this transformer & supply tiny PCB.... I disconnected all items from this PCB thinking that is what you had suggested .. I hope I'm right.

Anyhow, , as soon as i hit P1 button the 1.6A fuse that feeds the green cloth covered  wire going to transformer blew.

the other 1.6A fuse is OK

guess I'm needing a transformer ...

I prized apart the two halves of the outer shell with the hope of having all revealed, but not a lot can be seen inside other than a white donut with a few black streaks under the plastic wrapping