I would suggest nothing less than a CJ Premier 17ls tubed pre-amp. Your adcom is far below your amp and cd player and is without a doubt the weakest link in your system. I would not even consider modding it.
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What amp and speakers are you currently using as well as front end? I am running a CJ MF2500A with CJ 16ls2 and I am cosidering upgrading to the 140. I have an SCD-1 and Thiel 3.6 speakers with audioquest anaconda interconnects and volcano speaker cables. I am concerned that I will lose bass control with the tube amp. Although, all I have to compare it to is a premier 11a; the 11a didn't have enough horsepower to drive the thiels at least in the bass region, but did do a very nice job on the mid to high end.
I listened to the CJ 140 in my system: CJ 16 LS 2 pre, Sonic Frontiers SFM 160 monoblocks, Montana EPS speakers, Audiomeca Mephisto 11.X cdp, VPI Aries, JMW arm, Ruby 2 cartridge, Manley Steelhead phono, PS Audio P600 line conditioner and Discovery Essence wire. The Montanas are 92 dB and the SFM are 160 watts per channel so I find the bass quite adequate .