3 - 8 GROUND SWITCH:

At the very right of the Tube Bay is a mini-toggle switch which you will probably set once and then leave alone. The easiest way to understand the purpose of this switch is to consider the TIGRIS as having two separate reference groups to ground: one external and two internal. The internal Grounds are the common zero voltage points for the power supply and audio circuitry. The external Ground is the safety

connection of the metal chassis to your home’s Ground Circuit.

EL84

6V6

The grounding switch either connects (coupled position) the internal grounds with the external, or floats (isolated position) them. In either case, the chassis remains connected to your home’s Ground Circuit for safety reasons.

2/3 PENTODE

2/3 TRIODE

COUPLED

ISOLATE

 

 

POWER SELECT

AUDIO GROUND

Ideally, only one component in your system should be internally referenced to A.C. ground. Customarily, this is the source component. If more than one component of the system is tied to power ground in this fashion, audible hum and buzz may occur. To find out what position ( grounds isolated / grounds coupled ) is appropriate for your system, engage the WARM switches to their OPERATE position. Open Volume control of the TIGRIS to about its 9 o’clock position while you have one ear pressed close to the drive units of one of your speakers. If the length of your speaker cable does not permit control over the volume and ground switch while close to the speaker, you might ask a friend to help you.

You do NOT feed signal, but merely listen for the level of noise.

Slowly increase gain until you hear noise reproduced by your speakers. Now change the switch setting. If the noise level drops or becomes inaudible, you have found the optimum setting. If it increases, keep the switch in the original setting and experiment with cheater plugs on some of the other components, one at a time. NEVER saw off the ground leg of a three prong connector to reduce noise - use an adaptor!

If you don’t notice any noise in either the coupled or isolated position, you may, with critical listening, still discern a difference in overall sound quality. The isolated position will probably provide a more open and spacious soundstage.

3 - 9 CONGRATULATIONS:

You are now ready to commence your first listening session. Cross off the following check list in your mind: • The Headphone / Speaker selector on the Rear Bay is set to SPEAKERS.

•The Input Selector shows the source you intend to play

•The Volume control is fully turned down.

Now select PLAY on your source component and slowly open the Volume control until a pleasing play back level is achieved. As a reminder...always raise the level of the volume that you are going to listen to gradually. Its a lot easier on your speakers an d your ears. It might be a good idea to get into the habit of reducing the TIGRIS’ volume when your listening session is over and you shut down

WARM

CD

AUX 1

 

WARM

 

TAPE

 

AUX 2

V A C U U M T U B E A U D I O

 

 

 

OPERATE

 

 

 

OPERATE

 

 

 

 

HEADPHONE

 

Input Selector

 

Volume Control

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Mesa/Boogie Vacuum Tube Audio owner manual Ground Switch, Congratulations
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Vacuum Tube Audio specifications

Mesa/Boogie is a revered name in the world of vacuum tube audio, renowned for its high-quality amplifiers that have shaped the sound of modern music. Founded in 1969 by Randy Smith in California, Mesa/Boogie began by transforming Fender amplifiers into customized, high-gain models, ultimately gaining a reputation for producing powerful, versatile, and low-noise amplifiers. The signature sound of Mesa/Boogie is characterized by a complex harmonic richness, warmth, and clarity that resonates with guitarists and audiophiles alike.

One of the standout features of Mesa/Boogie amplifiers is their all-tube design. Utilizing vacuum tubes as the primary amplification source, these amps deliver a dynamic range and tonal complexity that solid-state amplifiers struggle to match. The quality of the tubes used, often hand-picked or specifically designed by Mesa, contributes to the unique audio characteristics of each model. The use of EL34, 6L6, and 12AX7 tubes in various configurations allows for a range of tonal options, from lush cleans to searing leads.

Mesa/Boogie amplifiers are also distinguished by their innovative technologies. The brand pioneered the dual rectifier system, which allows players to switch between tube and solid-state rectification. This feature gives musicians the ability to tailor their sound to preference, enhancing the responsiveness and feel of the amplifier. The Contour controls found on many models further exemplify Mesa’s commitment to versatility, allowing for fine-tuning of EQ settings that adapt to different musical styles.

Another hallmark of Mesa/Boogie designs is their attention to build quality. Each amplifier is crafted with robust materials, ensuring durability and reliability even in demanding performance environments. The custom cabinets and speaker selections are optimized to complement the amplified tone, providing a cohesive sound that resonates in live settings.

Mesa/Boogie’s reputation is enhanced by their extensive lineup, including the Mark series, the Rectifier series, and the Lone Star series. Each line caters to different playing preferences and styles, from jazz to metal. The versatility of these amplifiers makes them suitable for diverse genres, allowing musicians to explore their sonic identities.

In conclusion, Mesa/Boogie remains a leading force in vacuum tube audio, combining traditional craftsmanship with cutting-edge technology. Their dedication to quality, innovation, and tonal versatility ensures that they remain a favorite among guitarists seeking the ultimate sound experience. Whether in the studio or on stage, Mesa/Boogie amplifiers continue to inspire musicians to push the boundaries of creativity.
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