Thanks everyone for your help on this...I've put Steve's diagram and instructions through PaintShop Pro and uploaded the results into the 'files' section on the group.
?
Pentagrid - I've spent most of my life working on equipment without diagrams. Data sheets are of course a great help, but it's much easier if someone has the original manufacturer's diagrams and PCB layout, as I'm sure you will agree. The metal round IC, a mixer chip, isn't identified on the diagram...and the numbers have been removed from the physical part. I thought it might be a 'Birkett Special' Plessey SL640, but the connections don't match. I don't recognise the pinout and connections; is it familiar to you?
?
The original owner had used an 18-0-18 volt transformer, with a separate 3v winding to feed the filament of the display. I'm fairly sure the counter chip is faulty, but believe I have a spare one 'somewhere safe'.
?
I would never dream of installing it in my receiver, but will re-box it and sit it on the top.
?
Cheers
?
Simon M5POO
Simon Robinson