Manual or schematics for Advance OS15 Oscilloscope

[Bear2Biker]

8061Hi there folks, I wonder if anyone could please point me in the direction for the above manual or schematic diagrams.

I have 2 of the above single trace valve scopes, 1 working one not, there does seem to be a difference between them (one has pda the other not, one has paxolin PCB the other fibreglass & different CRT, I'm not sure what they are as all markings have come off.

The valves are 6 x ECF80 and 2x ECF82, & 8 ECF80 in the older one.

I've had a trawl through the Net but nothing coming up for these scopes, thanks in advance to anyone who can help.

Paul