Mesa Boogie Dual Rectifier

Valves for Mesa Boogie Dual Rectifier amplifier.

The Mesa Boogie Dual Rectifier and Dual Rectifier Solo amplifiers use:

• 4 x ECC83 preamp valves (also known as 12AX7).
• 1 x Balanced ECC83 for the phase inverter (position V5)
• 2 x 5U4GB rectifier valves.
• 4 x 6L6GC matched power valves/power tubes.

You can also use EL34 power valves in this amp so you may want to check what you have in there before you place your order. There is more information on swapping the power valves used below.

Over time your valves will lose both their power and, more importantly, their tone. So bring back the power and sparkle to your guitar amplifier. Treat yourself to a brand new set of valves and hear the difference.

We always recommend JJ valves for the Mesa Boogie Dual Rectifier amplifier. This is because they guarantee awesome tone and power at a very competitive price. JJ is one of only five manufacturers of valves in the world. So don’t pay more for rebranded versions of the exact same valves.

Order your valves for Mesa Boogie Dual Rectifier amplifier below and get your amp sounding like new again.

• All of our valve kits are carefully picked, fully tested and digitally matched before we post them out.
• These valves are selected and tested to perfectly match the bias requirements of this Mesa amp. This means you do not need to re-bias your amp.
• Perfect match for the Mesa STR440 Yellow valve.
• Fast shipping options available with full tracking and insurance so you can order with confidence.
• We have over 30 years experience in the valve industry so you are in very safe hands.
• International shipping around the world every single day.

Replace the Valves for Mesa Boogie Dual Rectifier amplifier.

If you have any queries about replacing your valves please do not hesitate to drop us an email. We have over 30 years experience so we are always happy to help.

We also have a very useful FAQ section where we answer all the most popular questions we get asked each week.

About the Mesa Boogie Dual Rectifier amplifier.

• Bias Select Switch (6L6 or EL34).
• 3 Fully Independent Channels with 8 modes.
• Each Channel features Multi-Watt Power Switch (50/150 Watt),
• True “Hard” Bypass Switch that removes FX Loop, Output Level & Solo
• Level Controls from the signal path.
• Tuner Output w/Foot-switchable Mute.
• External Switching Jacks for Channels 2, 3 (Ch 1 is the default), Solo & FX Loop.

Tubes for sale for Mesa Boogie Dual Rectifier amplifiers. Swapping 6l6 power valves for EL34.

On most Mesa Rectifiers, you can use either 6L6 or EL34 valves.

They do drop straight in, but you must toggle the power valve selector bias switch from 6L6 to EL34.

Step-by-Step Swap Procedure

Power Down and Cool: Turn off the amp, unplug it, and let it cool for at least 60 minutes to avoid burns or residual high voltage (up to 500V DC in the power section).

Remove Old Tubes: Gently rock and pull out the four 6L6 tubes from their sockets. Note the pin orientation (a raised guide bump on the tube base aligns with the socket).

Install EL34 Tubes: Insert matched EL34 tubes (e.g., from reputable brands like JJ, EH or Svetlana) into the sockets, ensuring proper alignment. Use a matched quartet for even performance.

Set the Bias Switch: Flip the switch from “6L6” to “EL34.” (or vice versa if you are swapping the other way). This is the required “bias adjustment”—it’s quick and tool-free.

Test: Power on in standby mode first, then switch to play.
Monitor for issues like hum, red-plating (glowing plates inside tubes), or unusual heat. If problems occur, revert to 6L6 and consult a tech.

Tonal and Performance Impacts 6L6 v EL34

With 6L6: Tighter low end, more headroom, and a modern American aggression.
With EL34: Brighter highs, scooped mids, and a vintage British vibe—often preferred for Rectifiers to cut through mixes, though it may reduce some bass punch.
No other mods (e.g., resistor changes) are needed, but always use high-quality, matched tubes to maintain the amp’s reliability.