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Silver rectangular audio component with visible vacuum tube, RCA jacks and volume knob

Bellari Audio

Bellari Audio BA-525 Tube Buffer 12AX7 Vacuum Tube Preamp

SKU CH-QRSJ-MPB94

A tube buffer using a 12AX7 vacuum tube to add harmonic warmth between source and amplifier, with 7Hz–129kHz response, 0.09% THD, 102dB SNR, 91dB crosstalk, RCA I/O, 15VDC 500mA power.

  • Rich analog warmth from a 12AX7 vacuum tube
  • Full-range clarity from 7 Hz to 129 kHz
  • Clean signal path with 0.09 % THD and 102 dB SNR
  • Precise stereo imaging via 91 dB channel separation
  • Compact RCA integration at 6 x 2.5 x 5.4 inches

Tube Buffer for Analogue Warmth

The Bellari BA-525 is a tube buffer that places a 12AX7 vacuum tube between a source component and an amplifier to add harmonic richness and depth. It suits audiophiles and music enthusiasts who want a smoother, more natural sound signature from an existing hi-fi stereo or headphone system without replacing core electronics.

Low Distortion and Wide Bandwidth

The unit achieves 0.09% total harmonic distortion and a 102dB signal-to-noise ratio for a clean, dynamic presentation. Frequency response extends from 7Hz to 129kHz with a +0dB / 0.3dB tolerance, while channel crosstalk measures 91dB to preserve precise stereo imaging and soundstage width.

Compact RCA Integration

A small chassis measuring 6 by 2.5 by 5.4 inches and weighing 2 lbs fits easily on a rack or desk, with straightforward RCA inputs and outputs for simple insertion into a signal chain. An external 15VDC 500mA power supply is required, so buyers needing an all-in-one mains-powered stage or balanced XLR connectivity will need a different solution.

Highlights

  • Rich analog warmth from a 12AX7 vacuum tube
  • Full-range clarity from 7 Hz to 129 kHz
  • Clean signal path with 0.09 % THD and 102 dB SNR
  • Precise stereo imaging via 91 dB channel separation
  • Compact RCA integration at 6 x 2.5 x 5.4 inches

Specifications

No published specifications for this item yet.

Questions about this item

How do I connect the BA-525 between my source and amplifier using the RCA jacks?

Connect the source to the RCA inputs, then run RCA cables from the outputs to your amplifier; use the included 15 VDC 500 mA supply and ensure the 12AX7 tube is firmly seated before powering on.

When will the 12AX7 vacuum tube need replacement and how do I know?

The 12AX7 tube typically lasts several thousand hours; replace it when you hear increased noise, loss of high-frequency detail above 129 kHz, or a drop in the 102 dB signal-to-noise ratio.

At what output level does the 0.09 % THD spec cease to hold during long listening sessions?

The 0.09 % THD and 102 dB signal-to-noise ratio are maintained up to the buffer's maximum line-level output; sustained clipping or loads below the design impedance will raise distortion first.

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