I was talking about a dedicated CD transport.
The problem with tube pre amps is the noise floor. You will never get 100db signal to noise ratio. While the rest of the chain like DAC are 120db. I am finding this is one meaningful spec.
I have not heard the F1J but having heard other amps by Pass they tend to have a more lush/heavier sound than other SS amps like ML. So a tube pre-amp might make it too much of a good thing. I would go for a more neutral sound and let the F1J retain its character. Just like I would not use a tube preamp with mine. I am getting great voicing/midrange out of the Accuphase that I would like to preserve, stuff that tubes generally excel at and not add more goodness. So if you think your system is lacking in midrange then only you should go for a tube pre amp or want to roll off the top but still have air and decay.(An anomaly?)
Edited by gurus - 2/2/13 at 1:25pm