Thank you for your replies . The main thing is to replace the volume pot with a stepped attenuator and (I think ) a resistor. Secondly, to bypass the balance pot . Thirdly, that feedback cap grounding wire that everyone seems to like so much . Fourthly, anything else you think is worthwhile - how much time do you have ? Live N.Derbyshire but will travel . Don't really need another 62, but does it have all the above and how much do you want for it ? Thanks, Nicholas.