I think someone has already mentioned these but when Richard was here last week he tapped and fitted a set of these feet to my SL-QL1 along with a new set of phono leads (in green this time) as the yellow set had developed an earth fault , now I'm not entirely sure which made the bigger difference but there was quite an improvement and Richard seemed genuinely startled , i don't think he was expecting it to be so big an improvement .

The new phono leads are a brand new design and I'm the guinea-pig so to speak , but i reckon these conical feet are well worth a try and you can buy them for £23 off eBay , a very good and cheap alternative to the Isonoes.