It's not my arithmetic, nor maths, that needs checking. They can easily be out by huge amounts.
It's the power vs voltage model that needs checking.
Maybe we will get to see whether your measurements are as accurate/inaccurate as my model predictions.
On second thought, I forgot about AndrewT. He is much more qualified to tell you which Apex amp to build. I will bow out of this.
thank you but i need an amp with more than 130 watt power and under 4 OHM speaker load
be patient
all of us is friend here.
thanks for your helping and all of people for this useful posts.
why mr mile do not answer my request ???
That has been my quandary. According to AndrewT you need +- 60V to get 150W/8R. But I thought +-60VDC was too much for the under 4R load that the OP asked for. I guess with that now with your recommendations he can decide what he needs.
I suspect you are going to find the same thing Apex said when asked which amp is his favorite. Answer.....The latest one.
Isn't his favorite something like the BX3330?
the more transistors the better.
Well in one reply he classified them as VFA and CFA and he did give an opinion but I also remember him answering the latest. That is kind of how it goes with DIY. The newest one is always a favorite until the next one. If you ever get around to building a good A/B setup you will be amazed how similar they all are.
35v rails for FH9 and 53v rails for FH9HV. HV uses ksa3503 and ksc1381.
For 35v rails:
300va 25va transformer per 2 channels. Each channel with 4700uF X qnty 4 in CRC with R=3.33ohm 10w.