Hiraga The Monster...

[gaborbela]

HI
Yes with regular power supply the Class A for me terible. Even I put together 500 000uF capacitors per chanel and still had no bass , and small stage it souded like a cheap $30 amplifier. I touht something wrong with the shematics. At first I used 13V zender dioda ,you know the shematics from the Hiraga site. Later I found another shematic with the 22v zender that sounded a bit better but still I was very uppset about it. After I made diferent tipe of pcb ,I touth that is the problem but not. I tried to use diferent capacitors for the power sup. but with out a good result. After I built the Capacitance M power supply it sounded much better but I was't satisfied with it. So I started to work on the power sup. For the 1000uF I used Frako 2200uF. And for the 10 000uF I used 50 000uF Mepco capacitors. The 470uF is remain the same value ROE capacitors. You can find the shematic at the ESP site. It is very important to use good quality transitor ,very sensitive for the transistor. That is the hart of the power sup.
I used TOSIBA 2SB755 with 2sa816 driver and another side 2sd845 with 2sc1626 driver.Rode said who designe the power sup any transistor is ok but for mi it did not work out.
I traied to use those tipe what he said but it was the same almost like the regular power sup.
I puled out these transistors from a damiged amplifier and it was amaizing to me.
The best sounded amplifier I was for me. Later I realised the 2x18V 300VA transformer it just enough for one chanel and I had heatsink problem to so I did not finnised the amplifier.
I have the original transistors from NEC and Hitachi .But much better to use MJ15024/25 for the driver MJE15030/31. These transistors has mor dinamic and more control over the music and much details .
I will plan to build a new if those amps what I build now will not provide the same quallity. I will have to make new pcb ,my pcb usless ,to much soldering.
Right now I working on the Zenquito amp to and I will use power supply wich would be good for the Hiraga to, in case if I'm not satisfied with the Zenquito.
If you buld the power sup. please use 100nF mounting capacitors on the 1 000,and the 10 000uF capacitors to. You will have to use soft starter .
I personaly I like the Rifa 100nF was made for AC voltage but for here is the best.
Right now I work on the Monster ,Zenquito ,Krell 50 amps ,if I finnish it may be I buid the class A to.