Using 110v amp and CD player in 220v

Many new low current equipments (like CD players) have power supplies that can use a wide range of power. For example: my Oppo DV980H can use 100 - 240 Volts 50 or 60 Hz. With such a device all you need is a new line cord to match the wall outlet.

Also, many equipments with traditional design power supplies have power transformers that are easily adapted to use different voltages. Sometimes it's as simple as a switch, or a jumper to be moved. Sometimes wires must be reconnected.

Check out these possibilities before investing in an external transformer.

For an amp, I suggest at least 2KVA (2000W) capacity. A quick Google led to APC Symmetra RM 5kVA (220/120V) as the pick of the heap but they're heavy for shipping and averaged around $700. I didn't see a smaller version. Generally used for large computer systems. There are plenty of cheap converters out there but you get what you pay for (away from our little audiophile world). Look at the weight.

Except for the Phillipines and South Korea, 220V is usually 50Hz. 50/60Hz usually isn't a problem for audio electronics, with the exception of turntable motors. Consult with the manufacturer to be sure. I know of no practical way to convert frequency, including a VFD, which are intended for electric motors.

International electrical "standards"
http://www.kropla.com/electric2.htm

Notice that Japan is either 50 or 60 Hz, depending on the region.

Is your 220V at a frequency of 60Hz or 50Hz? If 50Hz, are the converter and the audio components all rated for 50Hz operation?

Also, U.S. ac voltages are typically 120 to 125 volts these days, in much of the country. If you are running them at 110 instead, I would think that could account for the symptoms, particularly with tube equipment where the filament voltages are probably directly proportional to the ac input voltage.

As a first step, I'd suggest trying to measure what your stepped-down ac really is. And then, most likely, trying to find a converter with a higher output.

Re Q2, only if it is explicitly specified to run at 220V!!! And I think that a power conditioner is unlikely to help unless it provides some sort of voltage regulation or regeneration, such as some of the PS Audio units, which cost significant $.

Regards,
-- Al