When I first tried tube swapping I tried several tubes and I narrowed it down to either the Telefunken smooth plate 12AX7 tubes or Mullard CV4004 tubes. I ended up choosing the Mullards and I have run them for over a year without a desire to swap them out.
Jolida 100 cdp
I have a Jolida 100 cdp with stock chinese tubes. My system include B&K ST-202 with B&K Pro10MC sonota pre-amp, Alon II speakers. My listening habits include blues, jazz and indy bands. Looking to upgrade tubes to best suite system and listening habits. Are the RCA 5751 triple mica back plates the answer?