Converter of Pal signal to NTSC for NTSC television

Tweet

We have the following problem: We have a NTSC television (Sony) and over the last years, together with a converter (AIWA digital system converter), we have been able to watch tv in Holland and Belgium. However, for the last weeks our tv is starting to get moving stripes across the screen. Sound is oke, but the images all go awry. We are looking for a new converter to see whether that is the problem or if we have to buy a new tv. Would be a pity as it quite a large one (american standards). Any suggestions as to where we could look to get a converter that converts the PAL tv signal into an NTSC signal?