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ALO Audio

ALO Audio Studio Six Tube Headphone Amp | Phono Stage

The ALO Studio Six has been discontinued. The matching Phono Stage is still available.

The Studio Six is a Class-A single-ended triode (SET) circuit design. Zero-feedback and 100% tube amplification. Optional triode phono stage requires Studio Six amplifier.

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Our Take

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.


Built For Life

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.

Reference Amplification

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.

Totally Tubes

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.

Pure Power

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.

Designed For Headphones

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

S/N Ratio

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


About ALO Audio

ALO Audio was once known for their line out dock cables (LODs) for Apple iPods and other portable setups. Today their products include portable USB DACs and high-end classic tube amplifiers like the Studio Six.