for those who have bought a couple of surplus amps already, i would recommend that the next step be to buy a good preamp, preferably WS tono. after some disappointments, i finally got my first tono last wednesday from s2kov who shipped it to davao without hassle (fund transfer online was also instantaneous).
i separated the pre and power sections of my Alpha 907 and Accuphase, hooked it, did the A/B same-volume tests, "no epek" on sounds for both equipment! i prefer the built- in preamps of Alpaha and Accuphase which were a bit robust on the middle and a tad cleaner on the lows. but when tono was linked to my surplus amps, Yamaha CA-1000III and Kenwood KR-7400, and on the Sansui 907F (by loop dahil walang amp in), hanep ang lumabas. parang yung MF-A120 ko, in terms of clarity, na na-doble or triple ang power. pati mga lumang speakers ko naging pogi.