This is a great design to be honest. Being equally honest you could shave a lot of weight off by simply rectifying the wall current, running it through some common mode chokes and large value capacitors. This essentially converts the wall current into raw voltage for pushing some serious drivers. If you put enough MOSFETs in parallel you can drive quite the low ohms load without overheating too much. I know it's possible on 120vac @ 20 amps. It runs clean and quiet and will dim the lights if you push it hard enough. I think it would be some fun content if you reckon you can get your head around it.
You have an imposing amplifier there that can compete at any price point and in any timeline. With those Nichicons, heavy gauge wiring or bus bars might be calling soon. In audio you never say never, now you have great ideas for your neighbours SYMEF built.😉
Yeah, definitely worth looking at I think. Fortunately the leads are short - even shorter than they were before with the 10,000uF caps. The trick will be access to the amp board itself - I may have to take out the riser panel with the protection boards on it to get to the power in spade terminals.
Have you considered placing the transformers on top of one another and "upside down" right against the front panel? If that works height-wise, it would give you plenty of clearance. You could then shield the entire section with a U-shaped permalloy on a steel carrier and arrange the filter caps in a row towards the rear. I have tried CRCLC filter arrangement, despite increased output impedance and slight modulation. Resistors come with a diode bypass, ie once the voltage drop across them reaches the additional diode threshold voltage, it begins conducting. This tends to compensate voltage drop of the transformer under load and keeps rails at a more or less constant voltage for low to medium power output with high bias lateral fets. Ripple is comparable, but higher frequency noise is exinguished into oblivion, especially with ultra fast, soft recovery diodes rated at 25A, or more.
To do as you suggest was Plan B, and I even went as far as buying the riser panels to allow me to build a "shelf" for the second transformer. I think one of the challenges is that whatever one does, there is always a compromise somewhere. I quite like the symmetrical layout that I have ended up with.
@@audionautica6843 That's true, I've started with a gutted 3ch power amp enclosure, but in the process, had to have both the steel bottom plate and top cover made to measure, to accommodate large enough heatsinks for the high bias output stage and the power supply custom designed PCB. With DC inductors in place, there was literally a 1mm gap left in the end, so came pretty close. Have managed to retain the front brushed aluminium allloy panel though, which offered little consolation. Empty canvas look promising, then everything comes crushing (together).
Yeah, understand - I did a Hauptwerk organ conversion once of an old Allen console, and even with the mountains of space you have inside that, it was quite challenging working out where to fit everything and run the harnesses.
