Here is my new Mono Block Power Amplifer use 2A3 , I also put the balance power in a part of the main supply,which can reduce the hum and ground noise from the line power input, because their is no neutral - GND connection anymore. Use Balance power can Kill the ground noise

Also I use a new structure to build this project, normally, all the components will place in same level on the case, but this time, I put the amplifier stage and power supply board for each section in 2 layer structure, the advantage is shorten all the path of signal. reduce the cross noise from long wiring. from the filament to the each tube, now only 2-3 inch length. also their is NO thick copper hard wire as GND for every stage.. NO need anymore, each stage can GND it as star point connection and finally only one point is GND for whole amplifier stage. Use this type of structure is my first time, but seem is much better than the old style .

Also each power, each stage high voltage, each filament for 2A3 , 6C45 , all have individual power transformer . all total I use 7 transformer for one side amplifer.

Mono block , most important is balancing , each amplifier WISH all parameter is same, but infact is hard to make it, only is make it closely to each other. finally I get a very good balance for both mono block. and Sound is very very nice,, better than I use Mclntosh 7300 power amplifier.. Lovely !

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