The MX500 is an amplifier made by HH ELECTRONICS in the 90’s which has used a MOSFET as the main component of the final output.
The amps has a capability to deliver until 500 Watts at 4 Ohm mono load.
Moreover some reviewers say that the series amplifier is able to producing 180 watts of power for an 8 Ohm load.
Of Course its using a symmetrical 65VDC for the final output supply then 75VDC for the preamp and VAS.
Image of the amplifier HERE.
SCHEMATIC DIAGRAM
The picture below is the edited dan cropped schematic from the original version:
This circuit uses three blocks of whole schematic diagram.
Starting from the initial amplifier to the voltage amplifier and ending with the current amplifier.
Firsly, the preamp using two transistors which we usually call a long tail pair.
The output of this differential circuit is further amplified by transistors T3 and T4 which is T3 acts as a current mirror.
Next is the signal will go to transistor T5.
The output of this voltage amplifier is between collector T5 and collector T4.
The output of this Voltage Amplifier Stages is then goes to 2 pairs of MOSFET -type transistors to experience current amplification.
By using two or three pairs of these final transistors, its possible for this amplifier to generate power until 254 Watts per channel.
You can unite the supply became one voltages supply for the amps. Its only need the 65VDC only.
However, the risk is the output voltage to speaker will never exceed 65 Volts.
