Amp Camp Amp rail voltage increase

[MikeWinVA]

I like the Amp Camp amp except for its relatively low power.

Would it be possible to increase the Rail voltage to 36V without reworking the entire ouput circuit? I have found Blocked as a plug in power supply. (Edit: since the link is blocked: It is a plug in supply, like a laptop supply rated at 36V and 220 W and a 6.1A max)

The main output fet irfp240 has a Vgs of 20V and this power supply at 1/2 VCC would be 18V. Am I cutting this too close? Your thoughts please.

 

[MikeWinVA]

To add to the original post, the V 1.6 and 1.8 had only 2 changes. The first was increasing the rail voltage to 24V from 19V and adding a larger current limiting resistor to the power led to reduce brightness.