Musical Fidelity X DAC - very low output

[K-hole]

Hello!

I have just got my hands on one of the old school cylindrical MF X DACs. It seems to lock on to any signal I plug into it from either a CD/Sonos/TV but the output is extremely low and a little distorted. I've tried coax, optical on all the above sources and on 2 different systems and the issue is the same every time. Any ideas what ,might be causing this or how I could resolve?

Thank you.

 

[androa76]

One part of Power supply. Try to measure some voltages... DAC ic and opamps, also Tantals are not reliable.