Adjustable from 1 up to 15-, 30-, 60-, or 90-watts, yet only 12 pounds total weight
Interchangeable features may be changed for look, or removed to cut weight even further
Uses patented designs by David Berning, one of the world's premier audio designers
Hand-wound power magnetics & impedance converters
Transformer-less design eliminates drawbacks due to 'necessary evils' in traditional amps
No low-frequency saturation, high-frequency roll-off, or phasal non-linearities
Accepts 36 types of power tubes in any combinations; input tubes can also be changed
Plays "matched" tubes as well as tubes of completely, even wildly different types
Plays all standard tube complements and allows over 1.6 million other combinations of tubes
No adjustments required - all combinations of tubes are auto-biased
Impedance converters attain correct theoretical output transformer turns ratio
Automatic protection circuitry
Ramp-up turn-on delay extends tube life
10 - 20 years tube life depending on use
Low impedance output drives a wide range of speakers and is not damaged by no load
Class AB output stage; 2 push-pull pairs, can be used imbalanced for tonal effect
No heavy power or audio transformers - little or no hum
Domestic or Universal (autosensing 100-240VAC 50/60Hz) power supplies available
Fits anywhere, even inside a "small head" case with room to spare.
P3™ Phantom Power powers pedals and active pickups through the signal cable
Premium components and craftsmanship, made in USA
Milbert Amplifiers GAGA 60-watt tube head
by Rich Maloof / Vintage Guitar, Jan 2014
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Milbert Amplifiers has produced a genuinely revolutionary guitar amplifier in GAGA. Lightweight, exceptionally adaptable, and featuring an innovative transformerless design, GAGA may be unparalleled in matching versatility with supremely satisfying tube tone.
Under a hood of aircraft aluminum, GAGA has the capability to use any tubes, auto-match impedance to any speaker, adjust headroom, and provide phantom power for pedals. ...all players really need to know is that a transformerless amp allows pure, unfiltered tube response -- and that without a hunk of iron in the chassis, the head weighs just 12 pounds.
Any common power tubes can be used in any combination of two, three, or four tubes you like. Because the amp autobiases, you can even use mismatched tubes together to shape your tone. ... Without a transformer to drive, the distinctive qualities of different output tubes can be heard unimpeded. And because you can easily swap tubes after pulling off GAGA's top, the amp provides a singular opportunity to explore truly pure tube sounds. We exhausted only a handful of the hundreds of possible tube combinations...
Any speaker cab or cab pair can be connected to GAGA, regardless of load....
... well beyond the amp's capacity for emulation is an opportunity to discover entirely new timbres, and to nail a sound that otherwise exists only in a player's mind. ...touring musicians, session players, recording studios, and total tone hounds may find this amplifier undeniable.
Local Music Gear
"This amp is cool in so many ways! ...you build your tone and get to change it whenever and wherever you want. ...[Milbert offers] one amplifier that can perform as many different amplifiers -- and they did it correctly. ... you can get the sound of any amp you want with real tubes ... and [GAGA] weighs in at  lbs. Do I really need to say anything else?"
Performer Magazine, September 2014, pp. 46-47
GAGA, the Guitar Artists Guitar Amplifier ... uses advanced power conversion and other patented innovations ... to uniquely convey maximum tube tone and to attain what has previously been elusive: The verifiably purest-possible tube performance and a stunning "clarity of tone" that unleashes cleaner cleans, dirtier dirties, and a more natural, most-musical ecstasy...
GAGA D-15 15 W max audio power, 120 or 240 V mains
GAGA D-30 30 W max audio power, 120 or 240 V mains
GAGA D-60 60 W max audio power, 120 or 240 V mains
GAGA 90 90 W max audio power, universal world power
Each of the lower wattages is upgradeable. Domestic and world power universal supplies are available. Electromagnetically clean patented power conversion technologies maximize performance and greatly extend tube lifetimes. Numerous customizations are available, including some that are player-changeable: Different rubber feet (black, blue); wood sides, wood faceplate, various handles; different knobs, anodized aluminum hardware, etc. GAGA ships with standard tube complements - 6L6, EL34, 12AT7 - or with custom-selected tubes per specification. Available bare, mounted in a "small head", or mounted in a 1 x 12 cabinet, GAGA can fit practically anywhere.