Measurement Commentary
From a measurement standpoint as well, the TP101 A30 ranks among the best tube amplifiers we have ever had in our hands. Its ruler-flat and perfectly channel-matched frequency response extends to around 70 kilohertz; the output transformers roll off at the top end of the transmission range in an impeccably gentle manner – this is how it should be done. The unit measures virtually identically at eight and four ohms; the signal-to-noise ratio at one watt is an impressive 90 decibels (A), channel separation 86.3 decibels (A), and distortion 0.09 percent. An output power of almost exactly 40 watts is available, with distortion only increasing noticeably shortly before the clipping limit. The unit consumes around 121 watts of power at idle.
Conclusion
Quite simply: the TP101 A30 is among the best tube amplifiers I have ever encountered. It plays with outstanding lightness, atmosphere, and breathtaking beauty. This is how tubes should sound.”