Available Now at Northeast Music Center!
Give your MESA/Boogie Triple Crown TC-100 a complete tube refresh with the correct MESA tube complement. This replacement set provides four EL34 power tubes, six 12AX7 preamp tubes, and one 12AT7—the complete 11-tube configuration used in the TC-100.
The MESA/Boogie Triple Crown TC-100 is a serious all-tube amplifier, capable of everything from sparkling cleans and muscular crunch to tight, harmonically rich high gain. Keeping its tube complement healthy is essential to maintaining the punch, clarity, dynamics, and responsiveness the amplifier was designed to deliver.
MESA's official specifications confirm that the stock TC-100 uses four EL34 power tubes, six 12AX7 preamp tubes, and one 12AT7. The amplifier also provides a Bias Select switch allowing compatible 6L6 or 6V6 power tubes to be used, but EL34 is the original stock configuration.
Available from Northeast Music Center, this complete replacement set takes the guesswork out of re-tubing your Triple Crown TC-100.
• Specifically configured for the MESA/Boogie Triple Crown TC-100
• 4 × MESA EL34 power tubes
• 6 × MESA 12AX7 preamp tubes
• 1 × MESA 12AT7 tube
• Complete 11-tube replacement set
• Stock EL34 power-tube configuration
• Designed for MESA's maintenance-free fixed-bias architecture
• Complete power and preamp tube refresh
• Suitable for TC-100 head and rackmount versions
• Genuine MESA/Boogie tube configuration
The TC-100 leaves the factory with:
4 × MESA EL34 power tubes
and that's an important part of the amplifier's personality.
The EL34 platform contributes to the Triple Crown's aggressive midrange, harmonic complexity, tight punch, and distinctly rock-oriented response.
MESA currently identifies its EL34 STR-446 as an excellent choice for Triple Crown EL34-based amplifiers, describing it as having strong harmonic complexity, full mids, and rich low-frequency response.
For the player who wants to retain the TC-100's original EL34 personality, this is where we'd recommend staying.
The TC-100 also uses:
6 × MESA 12AX7 preamp tubes.
These tubes are integral to the amplifier's three-channel preamp architecture.
The Triple Crown isn't a simple one- or two-channel amplifier. It provides three independent channels with two voicings per channel:
CHANNEL 1 — Normal / Drive
CHANNEL 2 — Normal / Tight
CHANNEL 3 — Normal / Tight
Those six 12AX7s contribute to the gain structure and response that allow the TC-100 to move from pristine clean sounds through modern crunch and into serious high-gain territory.
There's one additional tube that's easy to overlook:
1 × MESA 12AT7.
MESA specifically identifies the 12AT7 as being used in the Triple Crown TC-50 and TC-100, and this lower-gain tube performs a different role from the amplifier's six 12AX7s.
That's why a proper complete TC-100 replacement set isn't simply:
Four EL34s + a handful of 12AX7s.
The correct full complement is:
4 EL34 + 6 12AX7 + 1 12AT7.
Tubes are wear components.
And their deterioration isn't always dramatic.
Over time, you may begin noticing changes in:
Punch
Clarity
Dynamics
Headroom
Gain character
Low-frequency definition
Noise
or simply the overall liveliness of the amplifier.
A complete replacement set gives you a known starting point throughout the entire amplifier.
Instead of wondering which preamp tube is old, whether the power tubes have substantial hours on them, or what may have been replaced previously, you can refresh the complete tube complement together.
This is an important advantage of using properly selected MESA tubes.
MESA explains that its tubes are tested and selected to operate correctly within the company's amplifier designs and fixed-bias specifications. When properly specified MESA tubes are used in a MESA fixed-bias amplifier, MESA states that there is no need to have the amplifier re-biased.
That removes a lot of unnecessary guesswork.
Install the correct MESA tube complement and keep the amplifier operating within the parameters its designers intended.
The TC-100 is unusual because its Bias Select switch allows the amplifier to operate with:
EL34
6L6
or:
6V6
power tubes.
Each option changes the response and personality of the amplifier.
But for this replacement set, we're staying with the stock EL34 configuration.
That's the configuration we'd recommend at Northeast Music Center for the TC-100 owner who wants to restore the amplifier rather than deliberately change its power-tube personality.
The Triple Crown TC-100 isn't an ordinary tube head.
Its three-channel architecture provides six available voicings.
MESA's Multi-Soak™ system provides independently selectable:
100 watts
50 watts
20 watts
7 watts
or:
3 watts
for each channel.
That means the power section can operate under dramatically different conditions depending on how the amplifier is configured.
The TC-100 also includes all-tube spring reverb, a tube-buffered effects loop, MIDI control, and MESA's CabClone system.
This is an amplifier worth maintaining properly.
That's ultimately the advantage of purchasing the complete TC-100 tube replacement set.
You don't have to determine the correct quantity.
You don't have to remember the 12AT7.
You don't have to piece together the power and preamp sections separately.
You get:
4 × MESA EL34
6 × MESA 12AX7
1 × MESA 12AT7
for a total of:
11 tubes.
At Northeast Music Center, that's how we'd approach maintaining a Triple Crown TC-100—use the correct tube complement, replace what the amplifier actually requires, and get back to playing.
Four EL34s. Six 12AX7s. One 12AT7.
Everything your TC-100 needs for a complete re-tube.
