Can't find the right power supply - could I use something similar?
I am not familiar with this product but a web search for the part number seems to refer to Power Supply Model MX1-xx where xx appears to be a country code - presumably defining the input voltage and mains plug.



Figure 1. Behringer MX1 style PSU.

2 x 19 V

The voltages agree with those you have quoted but are a bit unusual. Since they say 2 x 19 V AC at 2.6 A it implies:







simulate this circuit &ndash; Schematic created using CircuitLab

Figure 2. Likely power-supply arrangement.

The power-supply and mixer rectifier are probably arranged as shown. The rectifiers will peak at about ±26 V giving a nominal ±24 V supply in the mixer. You can see from this why a 12 V DC power supply isn't going to work.

Power calculations

From \$ P = V \cdot I \$ we can do a sanity check on the power specification: \$ P = 19 \cdot 2.6 = 49.4~W \$ or 50 W as per the spec. Now if it has two of these windings I would expect the total to come to 100 W but we don't see that. Maybe someone else can suggest an explanation.

The 32 V CT, 500 mA PSU probably reads 32 V, centre-tapped as in my schematic, giving 16 V per side. The current is too low so it probably cooked the transformer or blew an internal fuse.

Replacement

All is not lost. If you can find a transformer with two 18 to 20 V secondaries rated at 2.5 A minimum then:


Mount them in a box with 1 A fuse on the input.
Recover the connector and lead from your original PSU taking care to identify the centre-tap wire.
Attach the recovered cable to your new transformer taking care to connect the centre-tap wire to the correct point on the traffo.


Alternatively look for an MX1 PSU to suit.