Is that the 'Jumbo Tonebender'? Off the top of my head I think it has 3 BC184c Si transistors and was also made for other distibutors such as B&M. I cloned it after finding a B&M one where we did our last recording and it sounds great. There is a rumour that it is the one used on some of the Led Zep albums. The schematic is widely available.
