Mesa/Boogie II operating instructions MESA/BOOGIE Caliber Plus Owner Operating Instructions

Models: II

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MESA/BOOGIE

.50 CALIBER PLUS

OWNER OPERATING INSTRUCTIONS

MESA/BOOGIE

The Spirit of Art in Technology

CONGRATULATIONS! You've just become the proud owner of the boldest sounding, easiest operating 50-watt amplifier there is… and you're sure to enjoy it!

GREAT SOUND. Many months of patient, painstaking R&D were spent in developing the .50 Plus's special, high-gain "personality". We tuned (and retuned) its preamp section to make it capable of monstrous, fat lead tones while still offering plenty of crystal-clear headroom for rhythm. Its power section has been fitted with 6L6 tubes in a specially modified (and patented) circuit that offers fluid dynamic response with plenty of “give”. And a custom-designed vintage Celestion speaker - made exclusively for MESA/Boogie - provides a perfect blend of full-bodied clarity and warm “crunch”.

GREAT SIMPLICITY. One of the .50 Caliber's greatest virtues is its incredible simplicity of operation. It's nearly impossible to come up with a bad sound or a wrong setting. And here to help you get started is a brief explanation of your new amp's features and controls.

FRONT PANEL FEATURES

INPUT JACK This ¼” guitar jack is the instrument input to your amplifier. Patented “Dual Mode” circuitry makes this single jack work for both Rhythm and Lead… providing very high headroom for sparkling clean Rhythm, and super high gain for monstrous Lead playing. Be sure to use a good-quality, shielded guitar cord.

FOOTSWITCH JACK This ¼” jack connects to the Lead/Rhythm footswitch via the unshielded cable provided. When the red LED on the footswitch box is illuminated, the .50 Caliber is in the Rhythm mode… red equals Rhythm. Stepping on the button switches the amp into the Lead model and the LED goes out.

Should you lose or forget your footswitch you can activate the Lead mode by pulling out the "Pull Lead" switch on the Volume knob.

VOLUME (GAIN) This control is active in both Rhythm and Lead modes. It establishes the amplifier's overall sensitivity to your guitar's output, and must be mixed in conjunction with the Master(s). In the Rhythm mode, the maximum clean setting is usually around 6 (varies with stronger or weaker pickups) and most players find their favorite cleanest, brightest spot between 3 and 5. But if you want some breakup in the Rhythm mode, turn the Volume up high.

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Mesa/Boogie II operating instructions MESA/BOOGIE Caliber Plus Owner Operating Instructions, Front Panel Features

II specifications

Mesa/Boogie II stands as a landmark in the history of electric guitar amplification, known for its exceptional sound quality and versatility. Originally conceived in the late 1960s by Randall Smith, the brand quickly gained traction among musicians seeking a sonic upgrade from traditional amplifiers. The Mesa/Boogie II, introduced in the mid-1980s, captured audiences with its unique features and technologies tailored to professional performers.

One of the standout attributes of the Mesa/Boogie II is its dual-channel design, allowing players to switch between clean, articulate tones and high-gain distortion with the press of a footswitch. The amplifier offers a remarkable range of tonal possibilities, from sparkling cleans suited for jazz and pop to saturated leads that can cut through a mix in rock or metal contexts. This versatility is enhanced by the addition of a three-band EQ, enabling finer tuning of the frequency response to suit various playing styles and preferences.

Technologically, the Mesa/Boogie II incorporates several innovative features. The inclusion of the "Simul-Class" power amp design allows for an exceptional blend of tube saturation and solid-state reliability. This design marries the warmth of tube amplification with the punchiness of solid-state, resulting in rich, dynamic sound that is both powerful and responsive. Additionally, the Mesa/Boogie II utilizes the "Graphic EQ" option, offering a 5-band equalizer for even more extensive control over the amp's tone.

The construction quality of the Mesa/Boogie II is another hallmark of the brand. Built with durable materials and attention to detail, these amplifiers are designed to withstand the rigors of touring and live performances. The rugged chassis and premium components contribute to its reliability and longevity, making it a favored choice among professional musicians.

In terms of aesthetics, the Mesa/Boogie II features a sleek, robust design, often adorned with retro-inspired graphics and high-quality knobs. This not only makes the amplifier visually appealing but also reflects the brand's commitment to craftsmanship.

Overall, the Mesa/Boogie II remains a legendary amplifier that has solidified its status among guitarists. With its exceptional sound quality, innovative technologies, and meticulous build, it continues to inspire a new generation of players who seek the perfect blend of power and versatility in their musical expression. Whether on stage or in the studio, the Mesa/Boogie II is an enduring icon in the world of guitar amplification.