Yamamoto Sound Craft New A-08SS "45" Single Stereo Amplifier

Model number A-08SS is a model change version that has undergone a major evolution from the old A-08S.The sound quality advantage, which is a characteristic of the old model, has also been further improved with the new A-08SS. Although the A-08S had a small output, it boasted sound quality comparable to the finest 300B amplifier. This excellent characteristic is still alive and well with the new A-08SS. It is designed to combine with a high-efficiency speaker to bring out the best sound quality. The basic circuit configuration is the same as the Western Electric 717A driver tube and the output stage of the 45 vacuum tube, but the most distinctive feature of the A-08SS is that all the components used have been reviewed to improve the quality of the resistors and capacitors to the maximum.

In A-08SSCut cores are used, including power transformers that use cut cores that have excellent regulations inherited from the old model, output transformers that use 100μ thick Hi-B cut cores, and choke coils. In particular, the output transformer is made of fluororesin material with low dielectric constant as insulation paper for the coil, improving sound quality.

The chassis is made of a wood-based composite material called laminated reinforced wood, which is made of thin, solid cherry wood, soaked in phenolic resin, which has excellent insulation properties, and heated at high pressure. Its insulation properties are the same as those of phenolic resins, and its strength is stronger than that of phenolic resins. Although it looks the same as wood, it has far superior properties. The chassis made of insulatorThe high-strength chassis prevents the effects of eddy currents inside the amplifier, and reduces resonance and noise from vacuum tubes and components, contributing to high sound quality.

The vacuum tube socket uses high-quality, in-house sockets that combine fluororesin material with excellent insulation performance and phosphor bronze socket pins.

The most distinctive feature of the A-08SS is that it has been reviewed to the fullest extent possible, and the quality of the resistors and capacitors has been improved to the utmost. The circuit part of the amplifier, which previously used chemical capacitors, has been changed to a high-quality film capacitor in an ebony case. This change has made the sound even clearer and richer.

Additionally, the resistors have been significantly upgraded. The old model used winding resistance and metal film resistors, but the new model has been changed to a surface-mounted, high-precision, high-quality thin film resistor.The main resistors in all stages are surface mount thin film resistors made by Vishay, the US, with excellent characteristics, to improve the sound quality.The accuracy of the resistors used in normal vacuum tube amplifiers is 1% to 5%, but Vishay's thin film resistors are extremely excellent, with a resistance error of 0.1% and a temperature coefficient of 5PPM to 10PPM. high qualityThe resistor allows for lower amplifier noise and significantly reduces residual noise from the listening experience, the A-08SS achieves high sound quality, providing a purer and more detailed sound.

There have been no major changes to the basic design of the entire circuit, but the exterior can be distinguished from the older model, with a stylish flange attached to the meter. If the current value reaches 60% to 70% of the initial valueoutput tubeIt is time to replace.output tubeYou can see the condition of the tube with your eyes and visually check the lifespan of the vacuum tube.

The input terminal uses a chrome copper machined terminal for the external conductor, and the internal pin uses a round pin terminal made from adjacent bronze machined, and the highest grade pin jack uses Teflon as insulation material. The output terminals are large Teflon-insulated terminals with pure copper machined gold plating. This also allows you to connect an extremely thick speaker cable, which is 8mm thick. The speaker terminal is only an 8Ω output terminal, but there is no problem with using 4Ω and 16Ω speakers. However, in both cases, the maximum output will be lower. If the maximum output is 8W, the output will be around 4-6W.

The legs are made from African ebony, which is well-known for its beautiful sound, and is made from carved out. This African ebony material is actually used in oboes and clarinets, and it has a beautiful resonance, and is highly praised as a material for the company's setting base. The legs are directly fixed to a Comprite chassis to provide good strength and sound, and are accurately supported by the overall weight.

The A-08SS is truly an ideal model for music lovers and audiophiles. The outstanding sound quality inherited from the old A-08S and newly added improvements combine to provide an exquisite listening experience. Please try the precious vintage sound with the new A-08SS.