And nice collection of pins is your Big deal the williams one by any chance????   

Greetings ddstoys,

Yes it is the Williams and 4 player.

Thanks for the tip, Im going to check the switches tomorrow. I do think this is going to end up being trasistors as when I got this home it DID work for a little while (as mentioned in original post, previous owner said it was intermittent), hope to get this sorted and working; it will be virtual cigars all round!