Hi Guys Here is the reply from the seller. (Thanks Justin)
And I tend to agree with Laurie's observations, about blowing the original Op-Amps with reverse polarity.
As a side thought, they might be a JFET Op-amp low noise mod... Regards Dr. Bob
===Quote (Unedited)=== I bought the pedal about 5 years ago and it hasnt had any work done to it since I've owned it. Its a 30yr old pedal so I cant speak for its other 25years of life. It shows the signs of a pedal its age but has been looked after but definately had its share of gigging. I have gigged with it for a few years too. What are the mods that you can see? I would be curious to know. ===End Quote===
interesting about the chips being changed, even more so that the guy had no idea! its a shame he realised its old and worth a bit, might have attracted less interest if he didnt. which leads to me to my question, how much will it go for? im going to say $100AU. it is a little beat up though... would bid on it but currently 25hrs worth of flying time seperates me!