I've just finished HiVolt, using the excellent layout from Effectslayout (https://effectslayouts.blogspot.ro/2017 ... 0814985595
), but it didn't work. I found that the problem comes from the power supply part, which is wrong on the schematic.
So, you must disconnect 1N4001 diode from the pin 7 of MAX1044 and connect it to pin 8 (as I saw in many others schematic).
Now it works, but not as in videos. It hasn't a tight sound. It has a muffled sound. Maybe there are other errors in the schematic? I compared the FET part with BSIAB2 and some values are very different. The most strange part for me is the 33nF+10K+3.9K filter. What is for?
The tone pots has a weak action, especially for the mids.