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The Yamamoto Sound Craft A-08S is a highly regarded single-ended triode amplifier designed and manufactured in Japan by Shigeki Yamamoto. It delivers 2 watts of output power per channel using 45 vacuum tubes as the output stage, driven by 717A mini triode driver tubes and an 80 rectifier tube. The amplifier is renowned for its exceptional sound quality despite its modest power output, making it suitable for use with high-efficiency speakers (96 dB minimum recommended). The A-08S comes equipped with NOS (new old stock) vintage American tubes including genuine RCA 45s and Western Electric 717A drivers. The chassis features a cherry wood and composite construction with ebony legs, and all transformers are custom-designed cut-core units with Teflon insulation. The amplifier is known for its extremely low background noise, transparency, tonal accuracy, and ability to reveal fine details in recordings. It is available both as a finished unit and as a kit. The newer A-08SS model represents an evolution with improved component quality, though the original A-08S remains highly sought after by audiophiles.
Amplification power output and characteristics
Analog signal output specifications
Input and output connections
Size, weight, and appearance
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions
The closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The LM-508IA's power @ 8ω is 48W against the Yamamoto Soundcraft A-08S 45 SET's 2W, its input impedance 100Ω against 200Ω, and its input sensitivity 0.3V RMS against 0.7V RMS. Both share class (A).
Both turn up in the same documented systems.
The SH's output voltage is 0.5V RMS against the Yamamoto Soundcraft A-08S 45 SET's 0.7V RMS and its input impedance 20Ω against 200Ω. Both share class (A) and input sensitivity (0.7V RMS).
The 45 SET mono blocks's power @ 8ω is 1.5W against the Yamamoto Soundcraft A-08S 45 SET's 2W and its output voltage 1.5V RMS against 0.7V RMS. Both share class (A).
The WA22's power @ 8ω is 1.5W against the Yamamoto Soundcraft A-08S 45 SET's 2W, its input impedance 100Ω against 200Ω, and its weight 11.4 kg (25 lbs) against 17.7 kg (39 lbs). Both share class (A).
Wright Sound WPA 3.5 SET
Tube Audio Lab Korneff 45 Mono
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