Originally Posted by Shevon Perera
How many watts do I need? I have no idea how to figure this out.
I looked up your hybrid amp they call it--uses tubes for the preamp and is rated 15 watts per channel into 4 ohms. The fuse for 120V is 2 amps so look for a transformer around 300 watts if device can't be switched to 220/240V.
However, if it is rated 120V and 220/240, that usually implies it has a switch to change it from 120 to 220V. Sometimes that means the thing can be wired for 220V internally so becomes quite confusing. The only ones that can be plugged into anything are rated along the lines of this rating: 100 - 240 or 80-270V etc.
I went to Europe 25 years ago and my amplifier had to be rewired by moving jumpers in the power supply to run on 220V--there was no switch. One of those 100 - 120V and 220-240V see manual kind of things.
What I learned from that is those little converter things are fine for basic things but not for sensitive electronics--they will cause hum, most electronics won't work sort of thing.
If I was you, I would contact Monoprice and ask them how to change it to run on 220V since it is listed in the manual. How it does this depends on design be it a switch, internal jumper change or whatever. Change the fuse from 2A to 1A as 220 requires half the current of 120.
Hope it works for you once it is powered correctly, if not--then look at the power supplies first and home they did not spike and blow the output transistors. Good luck!