Yamamoto Sound Craft CA-04 tube type line level preamplifier

The CA-04 is a high-performance vacuum tube preamplifier dedicated to line levels, with the company's CA-03 and CA-03L, which have received several awards, and the line amplifier section is independent and the details are further refined. Rather than inheriting old types of circuits and sounds, it is designed to bring out the hidden charm of vacuum tubes and bring out the information-rich sound that is common in modern times.

The resistances are made by DALE, which has good sound, and the main parts are polypyrene film capacitors with little distortion.
Most of the resistances of CA-04 are made by US DALE. Many of the resistors made by DALE are made in accordance with the US MIL standard, and their sound quality is so excellent that it cannot be compared to domestically produced products of the same class. Its reliability is also several times higher than that of the general use.

The capacitors are mainly made in the USA polypropylene capacitors. Compared to regular chemical capacitors, this polypropylene capacitor has better response to pulsed signals, and the distortion rate of the capacitor itself is also very excellent. The difference in sound quality with these capacitors has a major impact not only on signal circuits but also on power supply circuits, so we use polypropylene type capacitors, including the power supply circuits, to improve the sound quality. Furthermore, the company fills the ebony case with high-strength epoxy resin to the capacitors that have a major impact on sound quality to improve the sound quality.

Contributes to vibration prevention by adopting a brass sub-chassis that prevents the effects of vibration.

Due to its structure, vacuum tubes are affected by vibrations at least in some way. The 6AK5W is a vacuum tube that incorporates a vibration-proof structure, but even so, the vibration still has an impact on the sound. The CA-04 has a strong brass sub-chassis under the board, and by joining the board and sub-chassis at key points, it prevents vibration and helps improve sound quality. The chassis structure also has a strong, vibration-resistant chassis structure thanks to the side panels made of solid cherry wood and the frame structure made of stainless steel fittings.

Beautiful cherry blossom front panel and side wood create a beautiful shape

The front and side panels of CA-04 are made of wood panels made from domestically produced solid cherry wood. The other parts have a beautiful 2mm thick aluminum chassis, resulting in a beautiful form. This design is the same as the company's A-08 and A-09 power amplifiers, and the two are designed to match both in terms of design and sound quality as a pair.

A highly reliable type made of chrome copper input/output pin jack, and an original pin jack, and a Teflon socket.

The input terminals of this machine are chrome copper machined terminals for the external conductors, and the internal pins are shaped round pin terminals for the adjacent bronze machined, and the company's original, highest-grade pin jack, which uses Teflon as an insulation material. This pin jack is designed to connect from the ground side when connected, and to separate from the hot side when removed, making it an advantage in terms of safety.


The vacuum tube socket uses a non-resonant Teflon socket made by the company, which is highly regarded not only in Japan but also overseas. If the socket fits loosely, there is no point in strengthening the amp body. The company's amplifiers are designed to prevent vibration from the socket, so the effect is also very noticeable in the sound.

High-quality wires are used for the power cables, and hospital grade gold plated terminals are used for the plugs

The power cable of this unit uses a high-quality cable with a 3p inlet terminal, and the plug part uses a unique gold-plated pin with a National Hospital grade plug. The main unit uses a 3P inlet jack, so you can also exchange it for the cord you wish to use.