I have an old Kenwood KR-6030 100-watt/pc receiver from the early 80s. I was using it for my desktop system, but the Tape Out/In switches are too far gone despite repeated attempts to clean/recondition them. I was going to just short them out but took the lazy man's route and swapped out the Kenwood for an Aiyima A07. No difference in sound.I use tape outs for testing as they are prior to the the volume, balance, filter, tone and line stages. Otherwise the results would be worse.