Hi. I'm an electrical engineer of a certain age. I was sent a request by someone in this field of interest to offer ideas on how to identify this equipment.
First, the module is an IF amplifier of the type used in a radar or other specialized radio receiver system. It would be populated with a half dozen vacuum tubes of the 6AU6 or equivalent type. At least, that's what they used in most IF a,plifers at the time.
The mysterious cans with nuts on the ends are very likely to be radio-frequency transformers. Each transformer couples the signal from one tube to the next. That's why they are located between the tubes. Here's an American radio from the forties with a similar design:
http://www.ohio.edu/people/postr/bapix/M_91091C2.JPG
This one has its capacitors below the chassis, so you don't see them.
The transformers used in this equipment are rather unusual in shape. Military radios have requirements for ruggedness and repairability that are not present in commercial gear, so the designers spend a lot of money getting custom parts made for them. This means that there is likely to be NO SOURCE for these transformers, either surplus or new. Go ahead and make your own metal cans.
The three capacitors next to each tube are used to filter the DC voltages that keep the tube at its correct operating voltages. The 6AU6 tube needs three different DC votages, and each one needs a filter to keep radio signals out.
One of the photos of the amplifier strip shows a series of parts with wire coils around them below the chassis plate. Those are called choke coils, which is a type of inductor that filters the DC voltages in conjunction with the capacitors above the chassis plate.
If you want to figure out what model of British radar unit these came from, you will need to talk to a British ham radio enthusiast or military repair technician who's very old.
