Thanks for your reply Peter bit supprised by your experience on CD4 record wear? It just so happened I recently purchased quad records on ebay as I buy most of my present collection thought they were SQ but found they were CD4 format seem to be in good condition. Bernard

I am looking for a CD4 Demodulator unit (small printed board) to fit/convert my BeoGram 3400 so I can play Quad CD4 records, at moment only can play SQ format recordings. Can anyone help? B&O made two types of units 1974 to 1979 as accessories to fit Beogram 4000 and 3400. Alternatively anyone wanting to sell a Beogram 6000 where the modulator was