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Amp has been running for three days (about 30 hours of play). The system is computer via coax to Conrad Johnson DAC (which tends to makes things sound smooth) to amp to JVC SP-UX7000 (4 ohms and est 87 db sens. - this speaker tends to make things sound smooth) and a Andrew Jones Pioneer 8 inch sub. Music via CDs and Spotify.
I am comparing to my old TEAC MC D80 (60 watts claimed)
1st impression: Lack of low bass (20-40 hrz), lack of control with the rest of the bass. The lack of control tend to make male voices too boomy. The upper mids are a bit pronounced (in a tube way) and bright. Highs a little ragged. Good spaciousness and imaging.
Current impression: The bass tightened up a little, but the bass and mids are about the same. The upper mids and the highs have smoothed out a bit. It was so bad before, I ordered some new driver tubes and was considering selling the unit. The amp has a lively top end rather than a classic tube sound. Now, after the tubes have had some time, the amp sounds much better. However, the lack and lack of control over the bass is still underwhelming, but hey it is only $100.00 for the amp.
The above comparison was done against the TEAC MC D80. It is an older unit. A solid state unit. Pleasant sounding, but tends to round out the highs. This tube unit brings out much more detail than the TEAC. Again, however, the TEAC is able to do lower and differentiate bass better than this unit. I consider them equals. TEAC a bit boring vs. this amp has a lively mid, but lack low frequency control.
Maybe I am not running efficient enough speakers. Not sure, I will continue to play around with this amp. I look forward to more time with the amp. Will try out the after market tubes soon.
Just FYI, there is no comparison to my main system (VTL amp, CJ pre). This is not a giant killer type of amp. I consider a fun amp. Something to play with and cool to see the glow of the tubes next to the monitor screen.