Sovtek 12AX7LPS / ECC83 Vacuum Tubes - Matched Pair (2)

Matched Pair of Hand-Tested Sovtek 12AX7LPS / ECC83 Preamp Vacuum Tubes

This pair of gain matched Sovtek 12AX7LPS tubes is widely considered one of the highest-performing new-production 12AX7 tubes on the market. Featuring a signature long-plate construction and a spiral-wound filament, the 12AX7LPS delivers exceptional gain, outstanding detail, and ultra-low hum in high-gain guitar amplifiers and precision audio circuits.

Tone & Sound Profile

Known for their smooth, and articulate frequency response, the Sovtek 12AX7LPS strikes a perfect balance between clarity and warmth. Because of its long plate design and spiral filament—which significantly suppresses AC hum—it is particularly renowned as an ideal choice for the phase inverter (V3/V4) position in tube guitar amps (or V1 if you're looking for some high gain aggressiveness), as well as line-stage preamps in vintage and modern hi-fi setups. Popularly used in Mesa Boogie amps. 

Key Features & Specifications

• Tube Type: Dual Triode Preamp Tube
• Construction: Long Plate with Spiral Filament 
• Origin: Made in Russia
• Testing & Matching: Individually tested for gain (Mu) and mutual conductance (Gm) on regulated Maxi Matcher equipment at full operating voltage. Matched by gain (Mu). Balancing available upon request (please leave a note on your order with any requests).
• Best Applications: Phase inverters, high-gain guitar amp preamp stages, hi-fi audio preamps

Direct Replacement & Equivalent Tubes

This tube is a direct, drop-in replacement for any standard 12AX7 circuit, including:

12AX7, 12AX7LPS, 12AX7A, 12AX7WA, 12AX7WB, 12AX7WC, ECC83, ECC803S, 7025, CV4004, CV492

The Viva Tubes Guarantee

Every Sovtek 12AX7LPS sold by Viva Tubes is thoroughly tested for gain and mutual conductance, and screened for noise and microphonics. Includes handwritten test data and our standard 90-day defect guarantee starting from your delivery date.

Need a single tube instead? View our single Sovtek 12AX7LPS listing. View all available sets here.