While most of the work I do is with valve amplifiers or Dacs, I do do some solid state repairs and upgrades too. This nice looking amp came along because the phono input hummed. On stripping it down-a lengthy job-it was apparent the second phono input was only earthed thru contact with a wire and no solder joint. The phono socket had gradually worked loose and no longer made contact. Because the socket is a tight fit I repaired rather than replaced it.