Great Tone. Flexibility. Portability.
These are all very compelling words when it comes to guitar amps. Until now, they've been just that: words.

It was in this conundrum that Greg Mackie saw the opportunity to once again be a major innovator in delivering audio to musicians, this time specifically for guitarists. More pragmatically, perhaps even a little selfishly, Greg was driven by his desire to create a single, great sounding and extremely portable guitar amp to carry to his gigs and recording sessions instead of trucking around his half a dozen or so boutique and classic tube amps. Four years after this seemingly simple revelation, the Mackie Hotwire VT12 emerges as the only tube amplifier capable of honestly being associated with the words great tone, flexibility and portability. To accomplish this, Greg took a completely different approach, unlike anything that's come before, and without assumption or compromise.

The result is the world's first Mode Switching guitar amplifier, which is a fancy way of saying that Greg preserved the proper use of the critical physical components and circuit designs found in real tube amps rather than trying to recreate classic tones by artificial means. Using real Class A and Class AB operation and performing complex circuit re-wiring on the fly, the VT12 gets its great guitar tone from time-tested analog circuitry, and reserves the "modern technology" for effects processing, where it belongs.

Features

Real tube tone, ranging from crystalline… read more clean to full-on high gain distortion sounds

Fully-configurable vacuum tube circuitry with 12 distinct wiring modes including, UK I, UK II, USA I, USA II, CLASS A, HI GAIN I, HI GAIN II, ACOUSTIC, HI FI, JAZZ, BLUES and LINE IN.

High power output – 120 Watt main amplifier with eight-position Output Power selector, plus separate 30 Watt amplifiers for compression driver and optional EX12 extension speaker

Maximum portability – with a curb weight of less than 25 lbs., the Hotwire VT12 is roughly half the weight of a typical single 12 in. combo amplifier… without any compromises in tone or output power!

Four-band tone stack (Bass, Middle, Treble, and Presence) with user-selectable USA and UK tone stack types

Storage capability for 96 presets, conveniently arranged in banks of Clean, Crunch, Overdrive, and Lead tones

A 12 in. custom-voiced speaker, with neodymium magnet structure for reduced weight while retaining the tonal characteristics of traditional Alnico speakers

A 1.35 in. Celestion neodymium compression driver with custom-designed waveguide, under wiring mode control for full-range applications

Front-panel selectable USA and UK speaker voices

32-bit onboard digital effects, including modulation (chorus, flanger, phaser, tremolo, modulated delay, and rotary speaker), delay (simple delay, tape echo, multitap delay), and reverb (room, stage, hall, plate, and short spring/long spring)

Pedal jack, for connecting optional PB1 pedal board or PB4 four-function channel selector switch

USB jack – provides streaming cabinet emulated audio to your computer (PC or Mac) for recording, and provides access to deep editing, preset archiving, live control, and firmware upgrade function.

Mode Switching: The Heart of Hotwire.
To understand Mode Switching, you have to first understand that the tone of any great tube amplifier is the result of distinctive tube types, specific preamp circuitry, rectifier design, power amp circuitry, speaker voicing and physical cabinet structure all converging into a single and soulful piece of gear. When any link in this well-proven chain is compromised, the resulting tone is equally compromised without exception.

Hotwire's patent pending Mode Switching technology electronically rewires the entire analog circuit path, changing the character of its preamp and power amp sections and re-voicing the speaker to actualize the recreation of classic (and through its extensive editing options, customized) amplification. Because Mode Switching physically changes the fundamental analog circuitry of the amp itself, each of Hotwire's twelve basic Modes is inspiring and real—from the expressive pluck and growl of Class A, '60s era classic tube combos, to the power and grit of Class AB American monsters. In between, you'll find everything from sparkling hi-fi to dynamic crunch tones, all responding to the slightest nuance of the player's touch. Hotwire delivers the rich body and natural tone demanded by the finest electric and acoustic instruments.

Shedding the Weight: A Bold New Power Section Design Focused on Tone
The power section of any tube guitar amp consists of a power supply and a power amplifier. They serve different purposes, yet work together and interactively to create the amplifier's signature tonal character and dynamic response.

Traditionally, tube amplifier power sections have required massive iron power and output transformers. While they're bulky and heavy, they provide the coveted "sag and bloom" that play a primary part in the feel of a great tube amp. These characteristics are critical to the nature of what guitar players simply refer to as "the tube sound." Because the analog components found in traditional designs are inherently imperfect, they dynamically sag and limit range as a player digs in, resulting in natural compression that gives the amp its distinct character.

Greg's driving vision was to design a power section like nothing before. It had to deliver uncompromised, soulful tone, while also providing something every guitar player has dreamed of since lugging a tube guitar amp up a flight of stairs: light weight. It's here that Greg faced one of the primary challenges to delivering on the lofty goals of Hotwire.

Greg's solution was to create the first modern, lightweight, switching power supply with the classic, purposeful "limitations" of a well-designed tube amp power supply – call it recreating imperfection if you like – and couple it with a discrete MOSFET power amplifier, the first of its kind created specifically for guitar applications.

Thanks to the engineering wizardry of Cal Perkins, Hotwire's MOSFET power amp design steps completely around the pitfalls of common bipolar or "chip-based" power amplifiers by incorporating premium discrete, hand-matched output devices in a proprietary high voltage, low feedback design. It shares all of a real tube amp's critical elements of tone recreation, performing faithfully and accurately at peak power levels, while retaining the feedback stability critical for exceptional tone and feel.

Classic Class A or AB, At Any Output Level You Want
Greg's smart power design opened new doors to creating classic tube tone more accurately. After all, one of the deciding factors in a tube amp's tone is the amount of output power being delivered to the speaker. A low-watt, single ended Class A amplifier delivers a distinctive, "greasy" overdrive and super-sensitive response to the player's attack on the strings. Slip in a higher output power amplifier design and it's simply not the same amp. The same holds true for every classic amp, big or small.

Hotwire provides eight power output levels to perfectly pair the power amplifier's headroom and overall output level with the desired preamp circuit configuration. Dial in from 1 to 120 watts to balance the accurate interplay between preamp, power amp and speaker and you've got more flexibility than any guitar amp has ever offered before. read less