**ON DISPLAY AT OUR STORE MUSIC LOFT**
Zesto Audio Bia 120 Class A Stereo Power Amplifier
Design Philosophy
With my pro audio background in the recording studio and live concert mixing,
I wanted to build an amp that allowed me to hear music the way I know it should sound.
I wanted it to be easy to use, reliable and with plenty of power to drive the speakers. In short,
I wanted power without compromising the music.
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 gives you options for your speaker preference
- Dual Mono gives you less cross talk 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
- 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 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
Specs
Specifications
Output
- Pure Class A
- 60 Watts per channel
- 4, 8 and 16 Ohm output taps
- 8, 5 and 4 Amp Slow blow fuses for outputs
- Eight 5 way binding post
- Non inverting output polarity
- Push-Pull and Ultra-Linear design
Inputs
- RCA single ended inputs Left and Right with an impedance of 100K Ohms
- Transformer floating XLR balanced inputs Left and Right (pin 2 hot)
with an impedance of 12K Ohms
- Independent ground lift switches on left and right balanced inputs
- 2 Volts RMS input to reach rated output
Detailed Specs
- Dual Mono
- Auto bias
- No negative feedback
- Frequency response 20Hz to 50Khz ~ 2db
- Total Harmonic Distortion ~ 0.22% at 1W output into 8 Ohms
- Gain of 23dB
- Noise level > 0.2 mV RMS into 8 Ohms with input shorted
- 1% metal film resisters throughout
- Polypropylene capacitors throughout the audio path
Power
- Custom Toroidal power transformer with global mains
- Choke based power supply design
- 120 Volts AC mains
- Optional factory installed 220V, 230V, 240V 50/60Hz
- Power consumption at rated output 300 Watts
- On/Off switch conveniently located on front panel
- 3 pin IEC power connector with fuse
Active Components
- Matched quad set of four (4) KT88 s vacuum tubes
- Four (4) Gold pin ECC82s (12AU7) vacuum tubes
- High quality gold pin ceramic sockets
Other Features
- Each unit is made by hand
- 50 hour factory burn in on all circuits and vacuum tubes
- Dimensions 17" W X 20" D X 10 H
- Weight 66 lbs. (30Kg)
- 16 and 14 gauge Zinc plated steel enclosure
