the rest of my system consists of antique sound labs mono blocks- the real small ones, ecl-82 driven at 7.5 watts each driving a pair of NHT super two's. i was using the NAD 705 as a preamp before the counterpoint and bass was no issue even with controls at flat, so i don't think my power amps or speakers are an issue. as a source I am using a rega planar two with a grado silver which i have also had for a while, the only variable is the preamp. the tube change sounds like a good first step because i love the sound and simplicity of the SA7 and would keep if i can improve the bass. its just too loose and undefined right now. it is also excessively noisy which hints me more at tube replacement.