help! please help !

because i am searching a power amp for my home studio use. but i found so many second hand power amp in ebay is 100V. so how can i use this kind of power amp in Hong Kong(220V) ? if i use a transformer, is it not stable ? thanks !!

Depends on the equipment, many items have self-switching supplies. Why not look at the UK, as we use 220-240V

BTW: in the future, can you avoid vague subject lines like 'help' - try to summarise your problem in the title as people are more likely to click on the link if they know what the problem is about. Thanks

Some equipment has a switch or jumper inside the case to swith between voltages.