Hi all, If you're wondering why I've gone quite on the 8032SK front, it's because I'm busy digesting lots of digital electronics books :) I'm surprised at how much I still remember from my school/polytech days - not to mention how much I've forgotten! And why is it two's complement seems so easy now, wheras it used to be so difficult? Weird... Anyway, another PET related question: I've got 4 of the things now, and all of them suffer from wobbly screens to some extent; the oldest (PET 2001) is the least affected somehow.... Aside: Tony mentioned this is probably the electrolytic(s) drying up, and that I should get an ESR meter (good idea, now that I know what one does); I think I'll get a kit one - more soldering practice :). Hmm. Back to the question... Each PET has a huge electrolytic next to the transformer marked "23000mF". Even given the can size, I assume they mean micro-F as opposed to milli-F; but 23000uF seems to be impossible to get, should I replace with a 22000uF or a 33000uF, both of which are readily available? Also, do other non-electrolytic caps degrade - if so, would it be worth replacing *all* the caps on old kit like this? Even so, is it worth replacing all the electrolytic caps as a precaution, or should I just wait impatiently for the ESR meter and only replace the suspect ones? And finally: I bought a "Tip tinner/cleaner" block, and now my soldering iron works a treat! Thanks guys, for rekindling my latent interest in "real" electronics! Cheers! Ade. -- B-Racing: B where it's at :-) http://www.b-racing.co.uk