The main CJA/CJC was the British HF Fleet receiver from the early 1960's and fitted in all ICS1 [STANDARD 3A] ships/submarines and also in ICS1 Mixed Fit [STANDARD 3B] ships. After the introduction of the FTA, is could receive all frequencies from VLF to HF. 

DETAILS:
https://www.commsmuseum.co.uk/receivers/94%20Rx%20CJA/pdfs/cja%20cjc.pdf

CJA:
https://www.commsmuseum.co.uk/receivers/94%20Rx%20CJA/pdfs/cjaimage.pdf

CJC:
https://www.commsmuseum.co.uk/receivers/94%20Rx%20CJA/pdfs/cjcimage.pdf

RICH  WA6KNW