In the Lead mode, the Volume knob is intentionally less sensitive so that there is no need to reset it when switching between the two modes. With most guitars, distortion begins around 2 with a real nice sounding blues-type tone reminiscent of old Fenders turned up loud. Settings above 3 or 4 produce the more modern and monstrous distortion sounds. Gain and distortion increase slowly as the Volume setting is increased, often producing the tightest, best-sounding heavy crunch tones between 7 and 9.

To prevent undesirable squealing, noise and feedback, the Volume should be reduced as playing loudness - via the Master and Lead Master - is increased.

MASTER This control regulates the power amplifier level and the actual overall loudness. (In Lead mode, the Master and the Lead Master work together “in series” to perform this function.) If you run the Volume at 10 and both Masters below 2 (in Lead mode), Grandma can nap in the next room while you annihilate Manhattan with monstrous metal performance! You'll still get the sound and feel of big amps cranked way up.

Turning up the Master begins to reveal the .50 Caliber's incredible sound-per-watt capability… it's noticeably louder than other comparably rated amps! The maximum performance for loud, clean Rhythm and hot, high-gain Lead playing comes around 5 and 4 on the Volume and Master, with the Lead Master set between 3 and 4. This puts the amplifier right in the middle of its range for great sound and easy footswitchability. The taper of the two controls is gradual enough so that dialing in both great Lead and great Rhythm sounds is quite easy to do.

However, the taper of the Master control gets radical above 5 and begins to unleash the maximum from your .50's power section. And this power amp has been designed to deliver its greatest crunch when turned up smoking loud! But you must turn down the Volume as you increase the Master, to avoid excessive squealing.

When you want to turn down to soft playing levels and continue to footswitch between Lead and Rhythm, merely turn down the Master. This will preserve the volume balance between the two modes.

LEAD MASTER This control affects only the Lead mode; it operates in series with the regular Master to determine the loudness of the Lead mode in relation to Rhythm. It should generally be adjusted after setting the Volume and Master controls. Since the Lead Master is located “before” the Effects Send jack (and the regular Master) in the signal path, it also acts as an effects send level for the Lead mode.

TREBLE This is the most powerful of the three rotary tone controls. At high settings (7 ½ and above) it will appear to minimize the effect of the Bass and Middle controls. But they will become the stronger controls when the Treble is set below 5. For those who split hairs tonally and want the very best, most bubbly and funky clean tones, you should find the exact spot on the Treble where all three tone controls are balanced. This will usually be somewhere between 5 and 7.

When playing hard-core crunch, especially at very soft practice volumes, the 50 will usually sound better with the Treble and Presence set quite high. This will help produce sustain and harmonic jumps at soft playing levels.

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Mesa/Boogie II operating instructions
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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.
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