Mogwai OG

Coupling Capacitor
Input Transformer
Output Impedance

The return of the Mogwai is to bring back one of our most popular amps. The Mogwai was always envisioned as the amp that could adapt as our lives changed. It provides for headphone use with 8ohm and 300ohm output and speakers via 8ohm 5way binding posts. Whether as the center of your personal listening station in office or powering your speakers in your home, the Mogwai does each equally well.

Our circuit offers the ability to roll a wide variety of tubes inexpensively and bring increased power to headphones without any sacrifice of design choices that conflict with our values.
The Mogwai combines the features of a full-sized two-channel power amplifier and headphone amplifier in a chassis that is suitable for a desktop use.

The Mogwai utilizes single-ended Class A operation with zero feedback to provide the essence of our Classic Wonder sound; strictly old school SET sound, without having to spend hundreds if not thousands of dollars on tubes.

The performance of the Mogwai is made possible with custom wound ultra-high quality output transformers from Transcendar, which provide excellent frequency extension and a flat response.

The Mogwai does not use a voltage divider network, but depends on transformers instead. We chose both 8ohm and 300ohm taps for headphones to offer the widest compatibility. You should feel comfortable driving planer headphones or Orthodynamics.

The Mogwai displays its transformers prominently on the chassis to frame in the tube compliment, which can vary from a 6L6GC to a KT88.

Volume control is handled by the ALPS volume pot to allow attenuation and simplify the signal path. Zero feedback on the outputs negates the need for a pre-amplifier; an iPhone can drive the Mogwai without issue.

The Mogwai differs from the Kenzie as it aims to provide powerful output while remaining true to classic tube design. As with all ampsandsound products, we strive for a neutral, non-fatiguing sound, and demand that all our products be ultra-quiet in operation. Quiet operation is not just a goal but a guiding principle that shapes all design and implementation choices.

Tube Selection:
Input tube: 6SL7

Output tubes: 6L6GC, EL34s, KT66, KT77, KT88, 6550s and KT90s
A personal favorite is the Tungsol 6L6GC STR. Warm, strong and tight bass.

Cathode Bias/automatic bias allows for easy tube changes without adjustment.
Compatible with 8ohm-300ohm headphones using either Low-Z or Hi-Z 1/4″ jacks.

Recommended Headphones:
Headphones driven successfully or tested with the amp include, MrSpeakers Ethers, MrSpeakers Ether Cs, Audeze LCD-2.2F, Audeze LCD-XC, AKG240, AKG701, Sony MDRV6, Sennheiser HD650, Sennheiser HD800, Beyerdynamic T1-32ohm, HIFIMAN HE400i, HIFIMAN HE-400S, HIFIMAN HE-400

The Mogwai is handmade with pride in Southern California with US-sourced parts, including our precision transformers.

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The Mogwai OG is intended to offer a high value versatile all tube headphone amp to the community.  The pictures on site currently may not show the dual ¼” headphone jacks. We will be reshooting soon. The Mogwai OG has received many of the same power supply improvements to the Mogwai SE, Its not as powerful or as flat in its response as the Mogwai SE but its represents an incredible sweet sound and quite operation.

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Specifications:       Noise floor is greatly reduced with Mogwai OG or older units.
Input impedance is 10K ohm with alps pot
Input Sensitivity 1.6V for full power out with input transformers

Power as measured with KT88 power tubes and 5AR4 rectifier
8ohm power: 5Watts RMS @ 1khz
Noise on 8ohm tapp @ 420uV RMS

300ohm power: 3Watts RMS @ 1khz
Noise on 300ohm tapp @ 700uVV RMS


Please look at our news section for feedback from owners of the Mogwai.