No, sorry - I’d advise substituting the pre with your Hugo, or ask your dealer to verify if it is indeed the 552 at fault.
Regards
Neil.
Ok… I picked up some cheap XLR female to male leads from a guitar shop, connected them to my Hugo TT… and voila… both channels of my amp are working.
So… the issue is the preamp.
When I take the 552 back to the dealer… should I also take the power supply?
Thanks to everyone for the assistance 
It’s also worth taking the DIN4 to XLR cables for the 300 to the dealer as well, just in case it’s a cable fault - that’ll be much easier to fix!
I’ll do that for sure!
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