I have no experience of head amps in this price range but you need something to plug them into so I guess anything is better than what you have at present. You'll need RCA connection from your amp so look for RCA input on the head amp. Amazon is probably the best place to look, a couple of names could be Behringer and Fosi, failing that maybe any other Chinese brand.
N.B. Please ensure your Cambridge amp has a tape or rec output.
Any questions just come back, there's plenty of guys on here who can help, including me.