I am currently using a Cary 94L preamp with the Channel Islands D200 monoblocks, the cary sounds good but it's costing me a fortune in mullard 12AU7's, these are the only tubes I like as I find other 12AU7's too bright and toppy. I could do with a bit more detail and more bass definition and was wondering if the Purist would be a good match with the D200's. Thanks. I'm from the UK.