Shuguang KT-88Z Black Treasure Tubes

Shuguang's Black Treasure KT-88 tubes are being run-in on my Cary amp at the moment.

Visually striking, these tubes are classy. Launched to commemorate the 50th anniversary of Shuguang, the Black Treasure tubes are said to have 60 differences compared to their normal line. The most obvious is the black high polymer compound carbon coating inside.

Initial testing upon power up resulted in a loud crackling distortion that lasted about 2 seconds before disappearing one one channel. It never happened again, so I would not put too much into that.

Trawling the internet revealed user accounts of long tedious burn in (200-600 hours), with an accompanying roller coaster ride in quality in the process. It kinds of reminds me of my Mundorf Silver-in-oil burn-in experience.

Thankfully, the Black Treasure sounded quite good from the outset. With about 10 hours under their belt,  initial impressions are that of exquisite refinement and quietness. Compared to the Genalex re-issues that preceded them, the Black Treasures had less bass bloom, but a more refined midrange and treble. The Genalex has more prominent bass, with a fatter upper bass that gives music solidity and heft. The Black Treasure is arguably tighter and more controlled.

The Back Treasure really differentiates itself on the midrange and treble. Apart from its inky black background, the dynamic contrast, and low level resolution were world class. Holographic presentation of instruments and voices, and the accompanying acoustic space were superb. The only fly in the ointment was the extension and air of high frequencies. Compared to the Genalex, the Black Treasures sounded restrained, and simply unable to let go. The local dealer and another hi-fi friend assures me that this disappears upon extended run-in.

I'll report back after further run-in.

Black Treasure tubes are available in Singapore from Live Acoustics, www.liveacoustics.com.sg

To be continued ...