Just thought I would report in ,
I replaced all the 870uf 10v malory caps with 1000uf 40v panasonics and its almost as good as it was new now (well ...kinda...lol ) . I have a few more caps to replace in the power supply but I don`t have anything close (I`m running out and need to restock just been so busy) , but happy as Larry so far , its made a massive difference just replacing those so I`ll now go ahead and replace the whole lot once they get here .
Thanks for your suggestions everyone , if you have one of these , ditch those mallory caps , I`m not sure why they used them along side good quality ones ? ? They didn`t need to used those old ones (70`s caps they are) along side the 80`s ones ...bit weird . Anyway its now very useable at least , the beam is a bit "thick" so it definitely needs calibrating once I get the caps in and wot not I`ll have a go at that but I dont want to make it worse !