dha sa Pinas, since ang power sa mains dili clean and stable, need ug UPS or AVR... sa mga countries na stable ang clean ang kuryente, these 2 are not needed... example. ako, my rigs are plug directly into the wall outlet...
about the "El Chipo" Electronic AVRs, my family used 3 sets... about 550 each and i had bought it last 1995... and one Servo AVR, i had bought it for 4.5K php last 1993... all 4 units are very alive and kickin'... the "El Chipo" ones age is around 18+ yrs old while the Servo type is aged around 20 yrs...
grabeh kaayo ang experience ani nila sa power surge sa balay nmo sa mandaue during the early and middle 90's... the time that they were bought until the early 2000... mag awop2x ang kuryente tungod sa low voltage... pwerte gud ka saba sa Servo type kay mag piti2x... wla man gyud ni sila ma guba. maybe, the units before were sturdy and reliable compared to the newer ones...