Yes, that would be interesting. The OR5 uses Hynes regs, so could be fun to play with that or so some serious surgery.

I'm not sure what voltage the Apex gear needs, but I'd be surprised if the Sigma 11 couldn't be set up to handle either of them easily.  It is, essentially, doing the same thing that the Volcano PSU is. 

I think Purrin used to have an Apex amp, he might remember some details.

Hi, do you know if you can use these DIY power supply units with an apex arete or peak?

I opened up the the Volcano power supply. It was basically transformer - diodes - cap bank... I think it was 110,000uF or something ridiculously huge. With the Arete, the PS sounded smoother with less grain or harshness. The effect wasn't huge.

The AMB sigma11 is totally different in terms of design.


UPDATE (found an old pic of mine):

i have no idea.  the sigma11/22 have no current limiting.  total continuous current is going to be primarily defined by the TO-220 package size, fuse and TX rating.  the MOSFETs are rated for 17A (or so, depending on temp) and a junction temp of 175C.  proper engineering principles would dictate around %50 rated max spec for continuous demands.  TK recommends Tj=100C max as safe for long term reliability.  the physical size of the TO-220 MOSFET package is probably the final arbitrator along with proper mounting techniques since power dissipation is related to surface area of the device.  i can ping TK asking what the reasonable max dissipation of the T-220 package is assuming big-ass heatsinks, or KG could chime in.