You don't use a TT, SACD, RtR, Cassette or anything else? That is the only way you listen to music? It's a streamer/server? I use everything, including a Victrola. Now if I could figure a way it would be hooked to the ol C2500 too. :-)
C2500 have you swapped the 2 stock 12AX7s in the "main" position to Telefunken?
I sure like my C2500 a LOT better with a valve change and good cabling. Should work like peas and carrots with MC501s. I don't use anything unless I have tone control.. I don't care what anyone says either.. They are wrong..:-)
Macs you flip a switch and it's a Line stage or with tone control either or..
I'm not a robot either.. click.
Regards