Aurorasound HFSA-01 Stereo Amplifier

AURORASOUND HFSA-01 STEREO AMPLIFIER HAS RETRO-STYLE APPEAL

The Aurorasound HFSA-01 Stereo Amplifier is a hybrid amplifier, from Japan, that uses the advantages of both vacuum tubes and semiconductors.

AURORASOUND HFSA-01 VACUUM TUBES

The EL84 tube delivers 14W + 14W power output.. The input stage has a built-in phono equalizer for MM-type cartridges, along with 3-channels of RCA unbalanced input terminals. The amp is equipped with bass and treble controls.

The output vacuum tube EL84, a pentode equivalent to 6BQ5, is operated in push- pull configuration. The driver for EL84 is a well-known Texas Instruments OPA604A, a high precision audio Op-Amp. Aurorasound developed a phase inverter circuit with the OPA604A to drive the push-pull operation in ‘the most ideal way’.

PHONOSTAGE

The phono equalizer uses Linear Technology’s semiconductor to achieve an excellent S/N characteristic with NF-type circuit configuration. This model accepts speakers with 4 Ω to 8 Ω impedance. In addition, it has a headphone output. The front panel is finished with Mahogany wood on both sides to enhance the retro appearance of the Aurorasound HFSA-01 Stereo Amplifier.

ISOLATED POWER SUPPLY

The power supply section is completely isolated between the vacuum tube and semiconductor to completely eliminating any interferences regardless of volume level and frequency range.

The rectifier is a low-noise Rohm’s silicon carbide diode and carefully selected high-quality capacitors and resistors are used throughout. The output transformer and power supply transformer are custom designed by Aurorasound and manufactured by a Japanese company.