A power-conditioning isolation transformer will help - especially with a 10% voltage swing. Try
http://www.sola-hevi-duty.com/products/powerconditioning/Index.htm
Or http://www.mcmaster-carr.com
Look under "transformers" "power-conditioning". I know that Sola has an Eastern European web-site and their products are readily available in 50 hz - not sure about McMaster-Carr's. Best of luck.
http://www.sola-hevi-duty.com/products/powerconditioning/Index.htm
Or http://www.mcmaster-carr.com
Look under "transformers" "power-conditioning". I know that Sola has an Eastern European web-site and their products are readily available in 50 hz - not sure about McMaster-Carr's. Best of luck.