Mesa/Boogie SPAX7 Preamp Tube

Replacement Preamp Tube for 12AX7
Mesa/Boogie SPAX7 Preamp Tube image 1
Mesa/Boogie SPAX7 Preamp Tube image 1
$22.00
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Mesa/Boogie SPAX7 Preamp Tube
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$22.00

Don't Settle for Just Any Preamp Replacement Tube!

The Mesa/Boogie SPAX7-A preamp tube makes the ultimate replacement tube for any 12AX7A in your amp. This premium product is considered a "special requirement preamp tube" because of its build quality and performance. The SPAX7-A shows very low sensitivity to microphonic noise — an essential attribute for a preamp tube (especially in high-gain, high-volume amps) in live or studio environments. No matter which tube in your amp's gain stage needs to be replaced, make sure to choose the right tube for the job — Mesa/Boogie's SPAX7-A!

Mesa/Boogie SPAX7-A Premium Replacement Preamp Tube Features:
  • Premium-grade substitute tube
  • Works in all preamp gain-stage positions
  • Ultra-high performance 12AX7 tube
  • Very low sensitivity to microphonic noise
  • Very consistent and reliable
  • Mesa/Boogie products are ONLY available for US shipping. Must be a U.S. resident.
The Mesa/Boogie SPAX7-A replacement preamp tube gives you premium tone and performance!

Additional Media

Guitar Amp Buying Guide

Tech Specs

Type Preamp
Model SPAX7
Manufacturer Part Number 750151F

Customer Reviews

4.5/5
Based on 4 reviews
Write your review
5/5

Great replacement preamp tubes

I replaced all seven pre-amp tubes (12AX7) on my Mark Five with these SPAX7 tubes. Excellent performance!! Well worth the few extra dollars!! Sweetwater is always a great place to get your gear!!
Music background: guitar player
4.5/5

Silent tubes!

I had a gig coming up and my Mesa Roadster was having some tube issues. Sweetwater was all sold out of the normal Mesa 12AX7 unfortunately so I figured I'd give these SPAX7s a shot since I needed some tubes asap. They're really great sounding tubes. Very quiet! I could barley tell my amp was even turned on when I wasn't playing! Even though they're supposed to be no different from the normal 12AX7, I still noticed a small difference in tone. Not a huge difference... but each channel's characteristics were slightly "tweaked" by the change. Mesa recommends that you use this tube in the V1 position... I'll probably do that next time but use regular 12AX7s for the other positions.
Music background: Hobbyist
4/5

Does what is expected

Sounds good - as expected.
4/5

Try it in a bass amp.

I put one of these in my Hartke HA3500 and its not bad. The tube added a little bit of brightness to the tone. Give it a try.
See also: Replacement Tubes, Mesa/Boogie, Mesa/Boogie Miscellaneous Guitar Amp Accessories, Mesa/Boogie Guitar Amp Tubes