Mesa/Boogie EL-34 STR 447 Power Tubes - Matched Duet

Matched EL-34 Power Tube Pair
Mesa/Boogie EL-34 STR 447 Power Tubes - Matched Duet image 1
Mesa/Boogie EL-34 STR 447 Power Tubes - Matched Duet image 1
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The Sweetwater Difference

The Sweetwater Difference

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Mesa/Boogie EL-34 STR 447 Power Tubes - Matched Duet
In Stock!

Put Premium EL-34 Punch into Your Amp's Power Section!

The Mesa/Boogie EL-34 STR 447 Duet amplifier tube matched pair packs big, classic tone into your amp's power plant. Mesa's best overall EL-34 set, the EL-34 STR 447 Duet works great for everything from classic rock to heavy metal. These matched tubes give your amp a focused, aggressive tonality, with plenty of low-end punch, rich midrange, and detailed highs. Great for all playing styles, these tubes add that upfront British character to your rig. Mesa puts these tubes in all their EL-34-equipped amps, and for good reason: the EL-34 STR 447 Duet flat out rocks!

Mesa/Boogie EL-34 STR 447 Duet Amplifier Tube Matched Pair Features:
  • Premium quality
  • The same power tubes Mesa installs in their EL-34-equipped amps
  • Reliable and consistent
  • Focused lows, powerful mids, and detailed high-end
  • Matched pair for the best performance possible
  • Important Notice for International Customers: Mesa/Boogie products sold by Sweetwater are intended for use within the United States. We are unable to ship any Mesa/Boogie products outside of the US.
The Mesa/Boogie EL-34 STR 447 Duet Puts British Punch in Your Amp's power plant!

Additional Media

Guitar Amp Buying Guide

Tech Specs

Type Power
Model EL-34
Manufacturer Part Number 750600D

Customer Reviews

Based on 8 reviews
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Great Sound

Great tubes!! The sound is clean and crisp and you get a very nice overdriven sound from them. The clean channel is excellant bright and jangaley.

Awesome upgrade for Blackstar HT

I recently replaced the stock Ruby brand power tubes in my Blackstar HT Stage 60 with these Mesa STR 447 EL-34's. I immediately noticed the huge difference in clarity over the Ruby's. I play long scale baritone guitars with heavy gauge strings detuned to drop C#, so chords on the low end can get a bit muddy if the EQ isn't quite right on the pre. I no longer have that problem. Granted I've always loved my tone through the Blackstar combo, but this tube upgrade has added serious color that I did not have before. My sound is based around a bass and treble boost with a mid scoop typical of modern American hard rock, so the punchier and clearer the better. These Mesa tubes gave me exactly that from the get go. If I hit an overdriven power chord I can easily discern each string, and if I palm mute the same thing I get that beautiful "chunk" that rattles the walls. Highly recommend these for any Blackstar owner.
Music background: Gigging modern rock for 8 years.

Mesa branded EL-34 STR DUET

Mesa branded tubes in my Blackstar studio 20 combo .These tubes brought it back to life .Mesa amps and parts are built like tanks. I am replacing all my tubes with them as needed. Perfect.
Music background: 30 yr gigging muscian


I have owned Mesa amps since the early nineties, and have learned, the expensive way, Mesa tubes are the only tube for your Mesa amp. They literally designed the amp around these tubes, so…unlike other manufactures amps these sound like I want night after night.
Music background: musician since 1977

Tubes from sweetwater

Ordered a set of tubes and one arrived damaged. The crew at sweetwater immediately sent a replacement. They communicated effectively throughout the entire process. I've always had great dealings with them and would highly recommend them to anyone looking to buy gear.
Music background: 35 years getting paid to do what I love
See also: Replacement Tubes, Mesa/Boogie, Mesa/Boogie Miscellaneous Guitar Amp Accessories, Mesa/Boogie Guitar Amp Tubes