I've been using US audio equipment in Singapore (220V/50Hz) using a 2000W step up/down transformer like this, and have not had any issues besides an occasional light shock when touching metal parts.
I recently added a turntable which requires 110V/60Hz to run at the correct speed, so i got this 200W travel converter which transforms frequency as well.
When i plug the turntable into the 2000W converter, there is only a barely audible hum, but it runs 15% slow. With the travel converter, the speed is correct, but there is a noticeable hum which shifts (seemingly spontaneously) between somewhat annoying and loud. It sounds like a ground loop hum but is still present even when i plug the power amplifier into the same travel converter as the turntable.
The turntable (an Elac Miracord 50H) has no ground for either the audio or power, but i did try running a wire to the ground terminal of the phono preamp (which is on the regular 220V circuit) and it didn't alleviate the hum.
Could this be a ground loop problem, or could the 60Hz output of the travel converter somehow be 'dirty'?
Thanks a lot for any help or insights.
I recently added a turntable which requires 110V/60Hz to run at the correct speed, so i got this 200W travel converter which transforms frequency as well.
When i plug the turntable into the 2000W converter, there is only a barely audible hum, but it runs 15% slow. With the travel converter, the speed is correct, but there is a noticeable hum which shifts (seemingly spontaneously) between somewhat annoying and loud. It sounds like a ground loop hum but is still present even when i plug the power amplifier into the same travel converter as the turntable.
The turntable (an Elac Miracord 50H) has no ground for either the audio or power, but i did try running a wire to the ground terminal of the phono preamp (which is on the regular 220V circuit) and it didn't alleviate the hum.
Could this be a ground loop problem, or could the 60Hz output of the travel converter somehow be 'dirty'?
Thanks a lot for any help or insights.