As we know the JLH class-A amplifier is very sensitivity to the power supply ripples. Even tens of thousands uf capacitors is not enough to provide a "clean" enough power supply. Noticable hums could be heard with 10000uf capacitors according to the DIYer's report.
This capacitance multipler is designed by a nice Australia audio amateur, Alan Cooker. He told us it's proven to be very useful with our free JLH PCB. So we designed a PCB for testing, the result is very positive. Before using this power board, there's lot of hums could be heard even 50cm away from the speaker (with 20000uf power cap). But there's no noticable hum even when the ear is only 10cm away with this power board.
We decided to make more boards and offers them to the DIYers for free.
http://www.siliconray.com/free-power-supply-pcb-for-jlh-amplifier.html
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