Available Now at Northeast Music Center!
Bring one of MESA/Boogie's legendary stereo power amplifiers back to full strength. This complete tube replacement set provides eight MESA 6L6 power tubes and three MESA 12AX7 preamp/driver tubes—the complete 11-tube complement required for the MESA/Boogie Stereo Simul-Class 2:Ninety.
The MESA/Boogie Stereo Simul-Class 2:Ninety is a serious piece of MESA history.
Designed to deliver 90 watts per channel, the 2:Ninety combines eight 6L6 power tubes with MESA's legendary Simul-Class™ power architecture, producing the authority, harmonic richness, dynamic response, and unmistakable tube feel that made it a cornerstone of professional rack systems.
MESA's official specifications confirm that the 2:Ninety uses eight MESA 6L6 power tubes—four per channel—plus three MESA 12AX7 preamp tubes.
This complete replacement set gives the 2:Ninety owner everything needed to refresh the amplifier's entire tube complement at once.
Available from Northeast Music Center, this is the right choice for players who want to maintain one of MESA's most powerful and respected stereo tube power amplifiers with the correct tube configuration.
• Specifically configured for the MESA/Boogie Stereo Simul-Class 2:Ninety
• 8 × MESA 6L6 power tubes
• 3 × MESA 12AX7 preamp/driver tubes
• Complete 11-tube replacement set
• Four 6L6 power tubes per channel
• Correct complement for the 90-watt-per-channel 2:Ninety
• Designed for MESA's maintenance-free fixed-bias architecture
• Complete power and preamp/driver tube refresh
• Ideal for maintaining a professional 2:Ninety rack system
• Genuine MESA/Boogie replacement-tube configuration
This is a serious power-tube complement:
8 × MESA 6L6
That's:
4 × 6L6 per channel.
The 2:Ninety uses those eight tubes to deliver 90 watts per channel through MESA's Simul-Class power architecture.
For players accustomed to today's compact solid-state and Class D power amplifiers, eight 6L6s may sound extravagant.
But that's exactly where much of the 2:Ninety's personality comes from.
This amplifier wasn't designed simply to make a preamp louder.
The power amplifier itself is part of the sound.
The complete complement also includes:
3 × MESA 12AX7 tubes.
These tubes are part of the 2:Ninety's front-end and driver architecture and contribute to the response and character of the complete power amplifier. MESA's official specification confirms the three-12AX7 configuration.
That means a complete re-tube isn't simply about replacing the eight large power tubes.
Refreshing the three 12AX7s gives you a known tube complement throughout the amplifier.
Power tubes are wear components.
And with eight 6L6s operating across two channels, maintaining a healthy, properly functioning power-tube complement is particularly important in an amplifier such as the 2:Ninety.
As tubes age, players may begin to notice changes in:
Punch
Clarity
Dynamics
Headroom
Low-frequency authority
High-frequency detail
and overall response.
Because deterioration can happen gradually, you may not immediately notice how much the amplifier has changed.
A complete replacement set provides a clean starting point.
One complete amplifier refresh.
The 2:Ninety uses MESA's maintenance-free fixed-bias design.
That's one reason using properly selected MESA power tubes makes sense.
MESA's amplifier and tube-selection approach was designed as a complete system rather than requiring the player to install arbitrary power tubes and then adjust the amplifier around them.
For the owner of a valuable professional MESA rack amplifier, that eliminates unnecessary guesswork.
