Thanks for the reply Marco! After asking you the reason for your purchase I thought to myself, "well it was probably cheaper than the original..."Hey Stone!
No... I'm not that good in electronics to do the mod myself, so I bought one on ebay made by this guy (SuperKing pedals). The basic reason is that the oroginal TS808 -from the '80- costs a lot (around 140£, if you are lucky). I gave only 35 quid for this pedal, with top-notch components.
And I like the sound very much!