MESA BOOGIE SPAX7 VALVE (INDIVIDUAL)

Maximum stability and silence with the MESA BOOGIE SPAX7 VALVE (INDIVIDUAL)

The MESA BOOGIE SPAX7 VALVE (INDIVIDUAL) is a 12AX7-type preamp tube specially selected and treated to offer the lowest microphonics, minimum noise, and maximum durability. It is designed for high-gain amplifiers or recording environments where tonal stability and vibration reduction are essential. Each unit undergoes a testing and selection process more rigorous than standard Mesa tubes.

Key features of the MESA BOOGIE SPAX7 VALVE (INDIVIDUAL)

• Premium 12AX7 selection with ultra-low noise level
• Microphonics and gain testing under real conditions
• Internal shielding with a metal “damping shield”
• Greater reliability in high-gain or reverb amps
• Direct replacement in any 12AX7 preamp socket

What makes the MESA BOOGIE SPAX7 VALVE (INDIVIDUAL) special?

Unlike standard 12AX7 tubes, each SPAX7 undergoes an individual control process that includes vibration, noise, and microphonics testing. This guarantees quieter and more stable operation even at high volume or under stage conditions. It is ideal for the first preamp position (V1), where noise and sensitivity are most critical.

Technical specifications of the MESA BOOGIE SPAX7 VALVE (INDIVIDUAL)

• Type: Low-microphonics 12AX7A / ECC83S
• Base: Noval (9 pins)
• Configuration: Dual high-gain triode
• Filament voltage: 6.3 V at 300 mA or 12.6 V at 150 mA
• Amplification factor (µ): 100
• Transconductance: Approx. 1.6 mA/V
• Maximum plate voltage: 300 V
• Maximum plate dissipation: 1 W per triode
• Internal damping: SPAX7 Shield metal shielding
• Recommended use: First preamp position (V1), reverb driver, high-gain channel
• Compatibility: Direct replacement for 12AX7 / ECC83 in specified equipment
• Noise level: Ultra-low (Mesa “SPAX” selection)
• Sales unit: Individual