milnes: D 5611; Diamond Schematic wanted

Dear Radiofriends
The daughter of a guest is desperately looking out for a schematic for this Model Diamond D5611, a battery operated radio from Milnes Radio, Bingley, GB. Her father would like to repair this radio from about 1936 but can't work with computer/internet.

But we received data and a picture through her and I would like to help. It seems that the search was in vain in other forums and that we are "the last chance" ...
Unfortunately the tube lineup is not complete. Otherwiese we could have looked up if we have schematics on radios with equal valves.

Possibly it is a superhet with a pre RF stage since the octode mixer VO2 is known on second place (if right). The problem is that there are several equal replacements for valves and therefore there are many combinations possible.

Who has further ideas or a solution please?

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It seems to be a very rare set. Can anybody offer to this radio lover what he should do if he does not get the schematic?

I got the answer now that indead the model has a RF stage before the octode mixer VO2 or similar. Which valve could that be please?

To thank the Author because you find the post helpful or well done.