Subwoofer problem Mackie swa 1801

[ri23c]

Do you know the voltage of the amplifier? The old owner has changed transformer and I do not know if that is the right one. The mounted transformer is 800VA with +- 90V DC and +- 18V DC. The +-18 V DCs are right because the schematic is written so, but other tensions do not know them.

[Jazz P Bass]

The power supply high tension filter capacitors are rated for 100 Vdc.

So 90Vdc will work.
It may be a bit high.

[ri23c]

Ok thanks, but what is the original voltage of the amplifier?

[Jazz P Bass]

I do not know.