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Mesa Boogie SPAX7 Preamp Tube
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Description
MESA SPAX7 preamp tubes are a premium grade 12AX7 that possess an even higher standard of overall performance due to their incredibly low sensitivity to microphonic noise. This is the ultimate preamp tube to use in critical gain stage applications, particularly in first stage/input positions or other high gain stages in the preamp tube string.
These tubes are selected during rigorous 12AX7 testing process and when found to be substantially more stable and quiet in extreme high gain applications, they are fitted with a shrink-wrap shielding, further stabilizing the tube and reducing external interference and noise. MESA SPAX7s deliver the lowest noise floor for the highest gain output. While not required for optimum performance, SPAX7s are a great tube to have on hand as spares and for any applications where the absolute lowest noise floor and low-microphonic response is needed.
All MESA tubes offer unsurpassed consistency and reliability for ANY tube amplifier, and certainly MESA amplifiers!
These tubes are selected during rigorous 12AX7 testing process and when found to be substantially more stable and quiet in extreme high gain applications, they are fitted with a shrink-wrap shielding, further stabilizing the tube and reducing external interference and noise. MESA SPAX7s deliver the lowest noise floor for the highest gain output. While not required for optimum performance, SPAX7s are a great tube to have on hand as spares and for any applications where the absolute lowest noise floor and low-microphonic response is needed.
All MESA tubes offer unsurpassed consistency and reliability for ANY tube amplifier, and certainly MESA amplifiers!
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Reviews
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3.4/ 5 4 Reviews
5 StarsBland
0 of 0 customers found this review helpful
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Product Experience I own it
Closest Store Burlington, Ontario
Overall, this is a very bland and lifeless tube. Tried it in a Dr Z Cure, and Mesa Mark V25.Expensive and not at all satisfying.
Posted by Robert on Mar 1, 2025
Nice change
0 of 0 customers found this review helpful
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Product Experience I own it
Closest Store Calgary Chinook, Alberta
Picked up one of these to try in the V1 position of my Blues Jr which had Mesa power tubes when I got it. I was looking for something to help reduce background noise. Used a DB meter app on my phone and found this basically knocks off 2 DB of background noise in various volume and tone settings compared to the stock GT 12AX7 that was in V1.
There is a notable change in overall tone of the amp. This tube cut almost all low end flubb (really like how the amp now works with my hollow body which can sound very boomy.) and added a nice clarity and chime. It did affect the gain however (Really fells like a 12AT7) so I’m not sure if this tube will stay In the V1 position indefinitely but it a nice tube to have on hand.
Posted by FXO on Jan 16, 2025
Installed in V2
2 of 2 customers found this review helpful
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Overall
Product Experience I own it
Closest Store Ottawa, Ontario
My Traynor YCV40 had its stock tubes (all 3 tubes were Sovtek 12ax7A) that I bought in 2005. It was time to change them.
I wanted a dirtier sound and searched for info on the internet.
So I use the GT-12AX7C in V1, to give the dirty tone I was looking for. In V2, right before the send effect loop, I put a Mesa-Boogie SPAX7, as recommended in another review. In V3 (inverter in some references, but called splitter in the Traynor manual) a Mesa-Boogie 12AX7 because I saw in a video that it was better if V3:a and V3:b signal have the same mV, which Mesa-Boogie tubes are supposed to be.
I'm very satisfied with the dirty sound of th GT tube. This preamp tubes setup provides me with more color, and more nuances. A pitched harmonic was neatly hearable, which was nit the case with my old and tired stock tubes.
I wrote all this information because I don't know how much this single tube is responsible for the change in my amp sound, but I strongly recommend this one.
Posted by Len P on Jun 17, 2019
Back to life!
2 of 2 customers found this review helpful
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Quality
Value
Overall
Product Experience I own it
Closest Store Toronto (Bloor St.), Ontario
Bought one of these to use in the front end of a used Mesa Blue Angel head. Used this with some Mesa 12ax7's and an at7 as phase inverter. Before retubing the amp was lifeless, was worried I bought a dud. Gave the amp a clean, loaded with the boogie tubes and wow. Great response, great low end, sparkle with a strat came back. Also brought back depth to the reverb which is a tube circuit. Maybe a bit on the pricey side but made all the difference. I'm going to look at these for my Marshall jcm900.
Posted by Andrew on Mar 18, 2019
Reserve in Store
| Product | SKU | Qty |
|---|---|---|
| SPAX7 Preamp Tube | 60249 |
