Further images and dimensions to be added
NSN 6625-99-972-6000 SIGNAL GENERATOR (2-250 MC/s) CT378A
The CT378A was designed in the late 1950’s  for the simple testing of radar and communications receivers. This unit bears the War Department/MOD crows foot mark (broad arrow)
The CT378A differs from -943-1825 CT378 in that its frequency was extended to 250 Mc/s and an additional power supply is included for use with pulse modulator. This signal generator was designed to provide signals between 25 mV and 1uV into a 75 ohms load at any radio frequency between 2 and 250 Mc/s.
This example is being sold untested and without cables and no travel case cover.
Sold for parts/repair/display.
Size -
The 'Automatic Coil Winder and Electrical Equipment Co.' were later renamed 'AVO Ltd.' (which should not be mixed up with 'Avo International Ltd.). AVO is known for its very solid and reliable measuring instruments, and coil winding machines.
£100.00 plus £15.00 UK mainland postage = £115.00 including delivery to UK zone 1 addresses.
For overseas postage and postage costs to UK addresses outside UK zone 1 please enquire.
Sold untested for parts, repair or display.
The war department manual pages illustrated in this listing are not included, they are purely for technical description. 
A full operator’s manual is available to download here -
https://frank.pocnet.net/instruments/AVO/HR/SignalGenerators/CT378A.pdf