mark, lahat halos ng commercial products talagang pinaghusayan ang power supply. if you look at conrad johnson's PV10A for example, matindi ang power supply but the circuit is the common grounded cathode->cathode follower.
meron mga tao, gusto tube rectifier, pag may diode ayaw bilhin. isa pang reason, minsan gusto mag tube roll sa rectifier.
yung tube regulation, kailangan ng extrang mga tubo for that, which means additional filament load, additional heat, additional sockets, atbp. samantalang kung passive regulation, choke and or resistor + capacitor, ayos ka na. of course may limitation with this.
kung solid state regulation, syempre may additional parts din, yun nga lang mas maliit sya, less heat, no additional transformer winding, atbp.
kanya kanya yan eh. sabi nga ni tony, pareho lang yan (tube vs. solidstate regulation)
re: listening session, fine with me. alternatively, you can drop by the house if you want to listen to the rest of my gears, dito lang ako sa makati.