Hi Eric, Nigel, on1aag and all,
Just openened the scope and looked for the TR152 as Nigel suggested. It is a CA3046 General purpose NPN 5 transistor array, B channel also has one TR252.
I swapped them round and still had no trace from A.
They don't seem to be FETs from the datasheet so I'm wondering if there is something else in another location I should check?
As to the checking voltages suggestion from on1aag, could you give me a bit more info IE what voltages I should be looking for?
I bet I bought another pup with the scope, people must see me coming.