Mesa/Boogie Stereo Simul-Class 2:Ninety 2x90W All-Tube Rack Power Amplifier — USA — N-2366

Reverb Condition: Good

Asking Price: $949.99 + Shipping — Offers Welcome

FULLY POWERED AND TESTED

Offered is a Mesa/Boogie Stereo Simul-Class 2:Ninety professional stereo tube guitar power amplifier, handcrafted in Petaluma, California, USA.

This amplifier delivers 90 watts per channel and incorporates Mesa's patented Simul-Class technology, combining two different tube operating classes within each power section to provide warmth, headroom, dynamics, and powerful guitar tone.

Designed for professional rack systems, the 2:Ninety is particularly well suited to pairing with Mesa/Boogie TriAxis, Quad and other compatible guitar preamplifiers.

IDENTIFICATION AND PRODUCTION HISTORY

- Manufacturer: Mesa/Boogie

- Model: Stereo Simul-Class 2:Ninety

- Serial Number: N-2366

- Country of Manufacture: USA

- Manufacturing Location: Petaluma, California

- Model Introduced: June 1992

- Exact Manufacturing Year: Unverified

- Finish: Black

- Format: 19-inch, 2U rackmount

Mesa's published production chronology confirms that the Stereo 2:Ninety began production in June 1992, starting with serial N-0001. The serial number is sequential and does not independently identify the manufacturing year of this particular amplifier.

FACTORY DESIGN AND SPECIFICATIONS

- 90 watts per channel

- Two independent all-tube power-amplifier channels

- Patented Mesa Simul-Class circuitry

- Factory design incorporates eight 6L6 power tubes, four per channel

- Three internal 12AX7 driver tubes

- Fixed-bias circuitry

- Independent Level and Presence controls for each channel

- Mesa Smart Power switching system

- Deep, Half-Drive and Modern voicings

- Line/Instrument input sensitivity selection

- Ground/Lift selector

- Fan-cooled chassis

- Separate speaker outputs for each channel

- One 8-ohm and two 4-ohm speaker connections per channel

- External switching connections for Smart Power functions

MESA SIMUL-CLASS TECHNOLOGY

The Stereo 2:Ninety uses Mesa's patented Simul-Class architecture.

Each channel combines Class A and Class AB tube operation to produce the characteristic warmth, dynamic response, and high-headroom performance associated with Mesa's professional guitar amplification systems.

The amplifier provides substantial clean power while retaining the tonal characteristics of a traditional tube output stage.

SMART POWER VOICING

The amplifier includes three externally selectable power-section voicings:

Deep: Enhances low-frequency depth and fullness.

Half-Drive: Changes the power section's operating response for reduced-power characteristics.

Modern: Provides a more aggressive, tight and forward power-amp response.

These functions are designed to interface with compatible preamplifiers or external switching equipment.

FUNCTIONAL CONDITION

FULLY POWERED AND TESTED IN STORE

The amplifier has been powered on and functionally tested.

Both amplifier channels have been tested as part of the store's functional assessment.

No functional defects have been reported.

The installed power tubes' individual ages, matching history, and remaining service life have not been independently established.

COSMETIC CONDITION

Reverb Condition: Good

This amplifier shows cosmetic wear consistent with previous use and rack installation.

Visible wear includes:

- Scratches and scuffs on the top metal chassis

- Surface marks and handling wear

- Finish wear around the rackmount ears and mounting holes

- Additional marks on the sides and underside

- General age-related exterior wear

Please review the complete photographs for the cosmetic condition of the actual amplifier.

ELECTRICAL CONFIGURATION

The rear identification indicates a 117V mains configuration.

The amplifier has an attached AC power cord, which is included.

This is a tube power amplifier and must be operated with suitable speaker loads and connected equipment according to Mesa's instructions.

ACTUAL MEASURED WEIGHT

33.4 lbs — physically weighed in our store.

This is the amplifier's actual unpacked weight, not the packaged shipping weight.

The manufacturer's published nominal specification is approximately 35 lbs.

ORIGINALITY AND SERVICE HISTORY

The exact manufacturing year, previous ownership, internal modification history, tube replacement history, and prior professional servicing have not been independently verified.

No claim of complete internal originality, recently installed tubes, or recent professional servicing is made.

INCLUDED IN SALE

- One Mesa/Boogie Stereo Simul-Class 2:Ninety tube power amplifier

- Attached AC power cord

- Installed tube complement

No rack case, external preamplifier, speaker cabinets, speaker cables, switching controller, or other accessories are included.

This American-made Mesa/Boogie stereo tube amplifier offers 180 watts of combined rated output across two independent channels, professional rackmount construction, patented Simul-Class circuitry, and extensive power-section voicing capability.

Price: $949.99 + Shipping — Offers Welcome

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