Excerpt from 6moons review: The CA-04 line level preamplifier is based on the same circuit as the CA-03L full-function preamplifier with phono stage, but contains slightly different component parts choices to hot-rod performance while the chassis sports a Japanese Cherry fascia with African Ebony knobs. Brian adds that "in terms of sonics, the CA-04 sounds almost identical to the CA-03L, although it may be a tad more neutral. You'd really have to do lots of back-and-forth comparisons to hear the difference." The CA-04 uses hand-selected Telefunken 6AK5W (5654) pentodes chosen for their superior tone when used in this preamplifier's zero NFB circuit. Note this detail: The capacitors are mounted in African Ebony cases filled with a special Yamamoto epoxy blend claimed to give improved tone over conventionally mounted capacitors. Gain is 16dB and the frequency response ± 0.5dB from 10Hz - 150 KHz.