Zesto Audio Bia 120 Stereo Tube Power Amplifier

Class A Design

The tubes are always on, so you have power when you need it. Class A is fast and responsive. There is no lag, providing your music more punch, transient response, better dynamic range and transparency.

Circuit Topology

I choose a Class A Ultra-linear, Push-Pull circuit design to deliver the most precise, enjoyable and faithful reproduction possible.

Unsung Hero

The unsung hero of a power amp is its power supply. That’s why my design incorporates a custom Toroid power transformer and a choke-based, dual-mono power supply to deliver all the “slam” you can handle.

Easy to use

With Auto Bias, you need no adjustments. It’s safe, consistent and the settings are always perfect so you can enjoy your music.

What is Bia?

In Greek mythology, Bia is the Titan Goddess of force and power.

Key Features

• Plenty of power to drive your speakers
• Pure Class A power is fast and musical
• 4, 8 & 16 Ohm taps give you options for your speaker preference
• Dual Mono gives you less crosstalk and better stereo imaging
• No adjustments with Auto Bias. Its safe, consistent and settings are always perfect
• Provides enough gain for most standard preamps and accommodate most speakers
• Choice of either Single Ended RCA or Balanced XLR to suit your needs or cable preferences
• Transformer balanced XLR input offers true noise rejection and isolation from the preamp
• Left and Right ground switches on the XLR balanced inputs to help eliminate ground hums
• No Negative Feedback provides for virtually no compression to your music
• Custom Toroid provides lower noise with plenty of available power
• The global mains power supply can work all over the world
• KT120 compatible
• Push-Pull circuit design gives you more power
• Ultra-Linear circuit design provides lower distortion
• Low noise levels allow really dark black quiet musical passages
• Non-inverting polarity retains the same phase as the input (so your trumpets blow and don’t suck)
• Gold pin sockets are more reliable because gold doesn't oxidize when it heat cycles
• Matched quad output tubes retain the stereo balance
• It’s ready to enjoy with 50 hours of factory burn in on all circuits and vacuum tubes
• Elegantly designed, heavy duty 14 &16 gauge zinc plated steel enclosure
• Each unit is hand built “Made in the USA”
• The wide frequency response allows you to hear the finest passages in your music
• High-quality gold-plated RCA, XLR connectors and 5-way binding posts
• All fuses are easily accessible