Yamaha M-70

stoN_Cold · Mar 23, 2015

Does anyone know what the secondary voltages on the main transformer?

avionic · Mar 24, 2015

jegor said:
Does anyone know what the secondary voltages on the main transformer?

The schematic isn't very ledgible. Kind of a uniquely wound transformer.Whats wrong with the one have?

stoN_Cold · Mar 25, 2015

I do not know whether it is primary for 120 or 240V.

avionic · Mar 25, 2015

jegor said:
I do not know whether it is primary for 120 or 240V.

Is there a part number on the transformer somewhere ?

avionic · Mar 25, 2015

Is this a replacement for a suspected bad transformer ?

stoN_Cold · Mar 25, 2015

avionic said:
is there a part number on the transformer somewhere ?

ga6477.

avionic · Mar 25, 2015

jegor said:
ga6477.

That transformer is for a "G" european model. 220V @ 50hz. Look at page 2 & 3 of service manual. Manual is avalable on hifiengine.

stoN_Cold · Mar 25, 2015

avionic said:
That transformer is for a "G" european model. 220V @ 50hz. Look at page 2 of service manual. Manual is avalable on hifiengine.

I have the SM, but the transformer, taken out from amp. & using variac with 100V on primar w. has 1.5A drain.