Using a 120 V / 60 Hz Yamaha audio receiver on 220 V / 50 Hz mains

you may mean 50hz/60hz,

it doest matter. most of tranformer can afford these two frequency.

be sure to clear the voltage is 115--120v. thats all.

remember its ac, dont use dc power.

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Hello guest, Your Yamaha receiver should handle the 60/50 Hz and the step transformer

is no problem. They can be found on the internet without to much problem. One place I have work at, one of the engineers bought some off ebay for a project overseas to run some test equipment and computers. They were set up with the universal plugs in and out along with voltage selects switches to match the voltages in and out. You just need to match the KVA rating to the load.

The only big thing is with 60/50 Hz is if the unit samples the line voltage/Hz for timing circuits the lower 50Hz would cause the clocks to run slower.Other wise most electronics should be ok at most a very small reduction in power out.

Charles

This lowered out put may over heat mono DC amps.

Hello bwire, on most "good amps" they should have a over temp circuit to prevent damage if it's starts overheating. If the unit had an analog power supply the voltage "could" be lower on 50Hz but the regulators should take care of it. If not you would have clipping sooner at a lower input. I've seen this in car audio.

On equipment that has switch mode supplies it will take care of it's self. Most switch modes can handle from 90-130 ac or 90-240 ac 50-60Hz It's just depends on what world market it's designed for.

Charles

Hello metalsmith, I've experienced spot burning within oil jacket on crown amps if voltage sags. Voltage sag is critical punishment for hi-end audio too.

But then I resolved by use of Sola Hevy-duty rectifier bridge transformers and APC UPS.

The output voltage of your 60HZ tranasforemr will drop somewhat since the transformed voltage in the secondary is a function of frequency.

If youhave a regulated power supply, the margin in the regulator design should be able to take care of it.

If you have a switching power supply( which I doubt for a receiver) the closed loop switching would take care of it.

If it really became a problem , you can source a replacement transformer and replace the 60HZ one.