PA12 is the variant of the amplifier of FROM AUSTRALIAN MONITOR which uses 4 pairs of MOSFETs and its able to produce until 1200 Watts of audio power in the Bridged Mode / BTL for 4 Ohm loads.
Under normal 4 Ohm load, the amplifier will produce audio power up to 600 watts each channel. ( SOURCE: PDF DATASHEETS )
INFO
The AUSTRALIAN MONITOR brands are not well known for Indonesian’s audiophiller because there is a possibility competing with other built up brands such as ROLAND, YAMAHA, PEAVEY, BEHRINGER, HARMAN KARDON, MACKIE and other well-known brands.
I am interested in collecting this AUTRALIAN MONITOR for their audio circuit because it uses a MOSFET for the final power transistor.
The manual service said that this amplifier made in the late 90’s.
SCHEMATIC DIAGRAM
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NOTE
BUZ906 has a power dissipation capability of up to 125W, which means that the amplifier using 4 MOSFETs of the same type, it will have a capacity of up to 500 Watts.(DATASHEETS ).
The datasheet says that the main voltage for the transformer is 67.1VCT and the transformer voltage for the preamp and driver is 17.1 VCT higher than the mains voltage.
So the voltage for the preamp/driver is 84.2VCT.
This means that the mains voltage for power is 90VDC and the voltage for the amp driver is 110VDC symmetrically.
Voltage power amplifier using 90 VDC. With this voltage, the transistor makes it possible to produce 730 Watts of power per channel.