Air Ministry Type 25 Radio Receiver Help Needed.

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This is my second post in a week. I can’t believe I’ve had that much down time!

I acquired this Type 25 Radio Receiver unit a couple of months back as an interesting slow time restoration project. I need to do a fair bit of research to understand what I’m dealing with. Is it even possible to get something like this into a working state?

Baby steps first. I’m missing some parts from this and need some help with ref numbers to try and locate the missing items.

Firstly there are no crystals. It looks like four are required of the 10X variety? These seem to be findable but what frequency should they be, as there seem to be numerous variations available?

I’m also missing the base cover/plate. Does anyone have a ref number for that?

There’s a hole where something should be (see first image – on the left). Does anyone know what’s missing from here and what the ref number for that is?

Any help would be greatly appreciated.

John