I just upgraded from an Audio Technica AT33Mono to a Miyajima Spirit cartridge. I mostly listen to jazz records and the majority of the collection are pre-mid-60's mono pressings. I though the AT sounded good, the Miyajima is a revelation, it's wonderful to rediscover the collection using it. One question I have is regarding playing modern mono pressings using the new cartridge - those that are cut using a stereo cutting head. The cartridge included a warning not to play stereo LP's - the cartridge doesn't have vertical compliance so it will damage the record. I was unsure whether this warning would also apply to mono records which were cut using stereo equipment. I would guess that it's ok, but wanted to see if there was a more informed opinion from the group before doing so.