AVS Special Member
Join Date: Mar 2008
Location: Australia; now run by adults.
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Could you post a link to the blog you mention please?
Most pro power amps without switchable filters usually have one cap determining the LF -3dB point. From your schematic, that would be C13, the 10uF/50V unit. This is easily replaced in many amps to lower the LF -3dB point for those wanting an infra response and (without looking at the whole EP schematic) is also likely the LF limitation here too.
Make sure you choose caps that will fit, or make arrangements so that they can be made to do so, eg PCB pins as stand offs or vertically mounting an axial cap. For the smaller values MKP or MKT types are best and there are plenty out there. Sprague 716P are good, easy to find and inexpensive.
Make sure you can solder/desolder without destroying the tracks.
Make sure you can do it safely - even 110V can kill you.
You know you're voiding warranty too right?