Atention: This ad is only for the Formula preamp rack unit. The pictures show several products.

One of the most versatile preamps made by Mesa Boogie (1995 - 2000), in fully operational status, with its original pedalboard included. Now it is mounted in my rack (see last picture).

Valves recently changed

Here's Mesa Boogie description:

Taking overall sonic direction from the Mesa Heartbreaker™, the FORMULA's Rhythm channel is undeniably black face, clipping sweetly when pushed.

It also incorporates a pull Boost on the Gain control for heavier sounds. Lead 1 starts out purring - very capable of furry chording, and continues on up to a violin-inspired, liquid gain voice.  Lead 2 shares the rotary tone controls with Lead 1 and allows you to auto-insert the 5 Band Graphic EQ. The independent Gain/Master harness allows the tighter, more urgent nature of Lead 2 to be fully maximized while roaming between the stinging, low gain bluesy region and a blistering high gain frontier.

What really sets the FORMULA apart from other pre-amps before it is not the amazing tone and versatility for live applications, but rather that it was - from the inception - a recording pre-amp.  The development of a new type of recording circuit that responds in frequency to dynamic fluctuations in the same way a power amp and speaker do, caused the emphasis to be shifted early on in development toward the studio. The uncanny ability to recreate not only the sound of a great power section and cab, but also more importantly the feel of a great rig - makes the FORMULA a must-have "bolt-in" for any control room.  This Wide-Track recording circuitry aboard the FORMULA makes recording direct guitar truly fun again through convenience and inspiration

FEATURES

• Handcrafted in Petaluma, California
• 5x12AX7
• 3 Channels w/Independent Gain & Master Controls
• 4 Modes (Rhythm, Boost, Lead I and Lead II)
• Pull Boost (Rhythm Channel)
• Assignable 5 Band Graphic EQ
• Output Level Control (over all channels)
• Parallel FX Loop w/Stereo Returns & Mix Control
• Wide Track™, Dual Recording Circuitry (Low Gain & High Gain)
• Stereo Main & Recording Outputs
•  External Switching Inputs
• 4 Button Footswitch (Rhythm, Lead I, Lead II & EQ)
• FORMATS: 1 Space Rackmount