The ALO Studio Six is a reference-grade tube headphone amplifier that pairs well with a variety of high-end headphones, a versatile performer for those looking to add a touch of tube warmth to their headphone rig. And the phono stage is quite handy for those easygoing evenings with your favorite record and turntable.
The uncompromising quality of build and design. Conservative part ratings and circuit design.
Translates into effortless, under-stressed operation, extended tube life and long-term amplifier reliability.
An obsolescence-proof piece of audio equipment, a timeless design built to last a lifetime.
Class-A single-ended triode (SET) circuit design with zero-feedback and 100% tube amplification.
Designed for resolution of fine musical details, expansive soundstage presentation, and lush tonal quality.
Only vacuum tubes with established reputations for sonic virtue are in this design.
Selecting tubes that are now and will continue to be available in the global audio marketplace.
The power supply is a “virtual dual monoblock” design.
Featuring vacuum tube rectification.
Filtering for the Left and Right input stages, including two glow discharge regulator tubes.
And separate multi-stage filtering for each Left and Right Channel output tube.
A proprietary output stage accommodates a wide range of headphone impedance from 8 to 600-Ohms, with ease.
The Studio Six drives many pairs of headphones with no sacrifice to fidelity.
The ideal amp for shared listening sessions.
The Studio Six is a Class-A single-ended triode (SET) circuit design. Zero-feedback and 100% tube amplification.
Its tubes have been hand-picked based on their long-established reputations for sonic virtue.
The ‘overbuilt’ power supply features robust multi-stage high-voltage filtering, for superior low-frequency performance.
The Studio Six features uncompromising quality in build and design throughout.
A timeless design built to last a lifetime and deliver an unmatched sonic experience.
Headphone impedance compatibility range
8 Ohms to 600 Ohms
Maximum rated output power
1,000 milliwatts into 8 to 32 Ohms
Amplifier input impedance
Amplifier input Voltage for full-rated output voltage into various headphone impedances
1.00V RMS input for 4.0V RMS output into 16 Ohms
1.30V RMS input for 5.7V RMS output into 32 Ohms
1.70V RMS input for 7.5V RMS output into 75 Ohms
1.85V RMS input for 8.3V RMS output into 150 Ohms
1.70V RMS input for 8.2V RMS output into 300 Ohms
1.65V RMS input for 8.1V RMS output into 600 Ohms
THD+N (1kHz input) at 1V RMS output into stated load impedances
32 Ohms: 0.26%
150 Ohms: 0.12%
THD+N (1kHz input) at 250 milliwatts output into stated impedances
32 Ohms: 1.0%
150 Ohms: 2.0%
Frequency Response -3dB (Referenced to 1kHz, 250 milliwatts output) into stated impedances
32 Ohms: 6.0Hz to 39kHz
150 Ohms: 16.5Hz to 36kHz
Frequency Response -1dB at full-rated (2.83V RMS) 1,000 milliwatt output into 8 Ohms
15Hz to 20kHz
78dB (unweighted) below full 2.83V RMS output into 8 Ohms
100/110/120 = 1.25 Amp / 250 Volt
220 / 240 = 6.30 Amp / 250 Volt