I own a ZH270 and I love it! I agree with Chris74. It does sound best with a preamp. I ran it straight into a cd player and the sound was missing dynamics and weight to the music. I use a Supratek Cortese preamp, and it is a fantastic match. The sound is lightning fast with great dynamic contrast. Low mid range has nice weight and body to the music. By the way, the Cortese uses 6sn7 tubes in the line stage.
