[julie_m]

If you post some pictures of the chassis and a list of the valve numbers, you will stand a better chance of getting an answer. This is because you will have opened up the field of potential answerers from "people who currently own or have used or owned a Grampian 506 and still remember everything about it" to "anyone who is not necessarily intimately familiar with the Grampian 506 circuit in particular, but still has enough general knowledge to be sure of a reasonable idea how to proceed if they had the set in front of them".

I would have thought whoever is doing the complete restoration for you would have been able to work out for themselves which valve goes where, though ..... After all, you're paying them to know how to do the job!