(8 votes, average: 3.13 out of 5)
Loading...“12AX7LP Sovtek tubes…very linear, has great looking curves…large full sound stage, very musical with great detail…smooth and involving” — Charles Kittleson, Editor, Vacuum Tube Valley
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The Sovtek 12AX7LPS is a solid contender for those seeking a vintage-inspired tone without the astronomical price tag of “new old stock” glass. The “LPS” designation stands for Long Plate Spiral, a unique construction featuring a spiral-wound filament designed specifically to cancel out hum in amplifiers with AC-powered heaters.
In terms of sonics, this tube is remarkably similar to the Mullard 12AX7 Reissue. It delivers a characteristically warm sound with a generous low-end response. While the bass is satisfyingly thick, in certain darker-sounding rigs, it can occasionally feel a bit heavy or “woolly,” sacrificing a degree of top-end transparency. The soundstage is impressively wide and well-defined, though it doesn’t quite reach the legendary, holographic depth of an original English Mullard.
Potential buyers should be aware that the long plate structure makes the tube more susceptible to microphonics. This sensitivity can increase as the tube ages, so it may not be the best choice for high-gain combo amps where vibration is intense. While the shorter 12AX7WC is a more rugged alternative, it lacks the harmonic fullness and “big” sound found here. Patience is also required: out of the box, the LPS can sound a bit thin, but after a few days of burn-in, it settles into a much smoother, fuller tonal profile.
A Brief History of Sovtek
Sovtek is a brand of vacuum tubes owned by Mike Matthews’ New Sensor Corporation and manufactured in the Xpo-pul factory (formerly Reflektor) in Saratov, Russia. Emerging in the late 1980s and early 1990s, Sovtek became a savior for the guitar amplification industry at a time when Western tube production was collapsing. By providing reliable, mass-produced versions of classic tubes like the 12AX7, EL84, and 5881, Sovtek became the standard factory-installed equipment for major brands like Fender, Marshall, and Mesa/Boogie, effectively keeping the “tube sound” alive for a new generation of players.
Final Verdict: The Sovtek 12AX7LPS is an excellent, budget-friendly choice for audiophiles and players looking for a lush, wide soundstage and low hum, provided their gear isn’t overly prone to microphonic feedback.