All those of you who like to laugh at other people's mistakes should be drawn magnetically in no uncertain way to our Care And Repair feature on Tape Machine Line-up in the June issue. Figure 2, page 55, shows a NAB equalisation curve, erroneously labelled 'Record Equalisation'. It should of course have told you all that it was a replay curve, because that's what it really was. The author points out that he can hardly be blamed for it: the source of the curve, British Standard BS 1568 Amendment Slip AMD 816 page 4, gives the curve under the heading 'Recording Characteristics'. This is unusually ambiguous for a BS document, of course, and it is only by careful and painstaking analysis of the graph's axis-labels by Symbolic Logic that the author has since discovered the problem. The BSI documents can be inspected at any main (UK) reference library, where readers are welcome to decide who to laugh at: the BSI or us. Answers on the back of a fiver, please.