Are ground loops even an issue in the Philippines? Parang hindi naman kumakabit sa ground ang power ng amps. Most of the noise I have heard from any amp so far is due to floating voltages raising the noise floor of otherwise quiet amplifiers. In my experience, mas malala ang issue na ito sa tube amps kaysa solid state, although naka-depende rin kung gaanong karaming gain stages built into the preamp.
BTT: I often play with two amps at home (I don't play live) and, up until we had actual ground connections installed in some of our power outlets, have had no noise issues due to ground loops. After having ground connections installed, amps run in mono are noticeably more quiet than before, but did develop a loud humming sound when run in stereo.
The solution for me was to simply lift the ground of one amp (not recommended, but I had no other option at the time). Now, I'm thinking of building a Mooer-sized ground lift box, so instead of lifting power ground on one amp, I simply lift the audio ground on the cables. YMMV.