State of the Art Tube Designs for Music Lovers!

Bia 200 Select, 100 Watt Class A Stereo Power Amp

Price USD $15,900.
Shipping, taxes, and customs are additional.

More power

Enjoy the Sound of different tube options
with our easy to use, exclusive Bias Select switch

Downloadable: Bia 200 manual
BIA 200 vs BIA 120 Comparison

Updates available for Bia 120 Stereo Amp.
USD $1,800 plus shipping, contact factory for details.
No upgrade path is available for a Bia 120 to a Bia 200.

Click here for details

Key Features

  • The Bias Select switch is engineered with 3 bias settings for 4 different output tube
  • Compatible with KT88, KT120, KT150 and KT170 output tubes
  • Bias Select switch is easy to use, change on the “Fly” so you can hear the difference
  • Auto Bias is safe, consistent and settings are always perfect
  • Class A power is fast for a more lively, immediate response to your music
  • 4, 8 & 16 Ohm taps gives you options for your speaker preference
  • Dual Mono gives you less cross talk and better stereo imaging
  • Choice of high quality gold plated Single Ended RCA or Balanced XLR connectors to suit your needs or cable preferences
  • True transformer differential balanced XLR inputs for the best noise rejection
  • Independent Left and Right ground switches on the XLR balanced inputs to eliminate ground loops and hums
  • No Negative Feedback design does not modify or compress the musical signal
  • Large custom Toroid is higher voltage for increased performance and lower noise
  • Global mains power supply can work all over the world
  • Provides plenty of gain for your system
  • Push-Pull/Ultra Linear circuit design provides lower distortion, more power, and a better performance out of your tubes
  • 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 KT150 output tubes retain the stereo balance and lower noise
  • Elegantly designed, heavy duty 14 &16 gauge zinc plated steel enclosure to accommodate the extensive grounding scheme
  • The optimized frequency response provides the best musical range to benefit the natural harmonic structure of the instruments
  • All fuses are easily accessible
  • Each unit is hand built “Made in the USA”

Specifications (based on KT150 tubes)

Output

  • Class A
  • KT150 = 100 Watts per channel into 8 Ohms
  • 4 Ohm, 8 Ohm and 16 Ohm output taps
  • 10A, 7A and 5 Amp 6mm x 32mm Slow-blow speaker fuses for outputs
  • Eight 5-way binding posts
  • Non-inverting output polarity
  • Push-Pull Ultra-Linear design

 

Power rating for Auto Bias Select Switch Settings

Left Position:

  • KT88 = 60 Watts per channel,
  • KT120 = 60 Watts per channel
  • KT150 = 60 Watts per channel
  • KT170 = 60 Watts per channel

Middle switch position:

  • KT120 = 85 Watts per channel
  • KT150 = 85 Watts per channel
  • KT170 = 85 Watts per channel

Right switch position:

  • KT150 = 100 Watts per channel
  • KT170 = 100 Watts per channel

 

Inputs

  • Transformer floating ground differential balanced XLR inputs
  • Left and right balanced inputs (pin 2 hot), impedance 10K Ohms
  • RCA single ended inputs Left and Right with impedance of 47K Ohms
  • Independent ground lift switches on left and right Balanced inputs
  • 5 Volts RMS input to reach rated output

 

Detailed Specs

  • Dual Mono
  • Auto bias
  • No negative feedback
  • Frequency response 20Hz to 30Khz ~ 3dB
  • Total Harmonic Distortion ~ 0.22% at 1W into 8 Ohms
  • Gain of 24dB
  • Noise level > 2mV -RMS into 8 Ohms with input shorted
  • 1% metal film resisters throughout
  • Polypropylene capacitors throughout the signal path

Power

  • Custom Toroidal power transformer with global mains
  • 15 Amp IEC power mains connector
  • 120 Volts AC mains with 8 Amp 5mm x 20mm slow blow fuse
  • Optional factory installed 220V, 230V/240V 50/60Hz with 4-amp slow blow fuse
  • Power consumption at rated output 517 Watts
  • Front panel on/off switch with green LED indicator for high voltage and amber LED for low voltage

 

Active Components

  • Matched quad set of four (4) KT150’s vacuum tubes
  • Four (4) Gold pin ECC82 (12AU7) vacuum tubes
  • High quality gold plated 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 64 (29Kg)
  • Shipping box = 27” x 27” x 13” (5 cm x 68.5 cm x 33 cm)
  • Shipping weight: 80 pounds (36 kg)
  • 16 and 14 gauge Zinc plated steel enclosure
  • Two year limited warranty
  • Six months warranty on 12AU7 Vacuum Tubes
  • Ninety day warranty on KT150 Vacuum Tubes

​Read Stereophile’s review of the the Bia 200 Select Stereo Power Amp

“Maybe it’s the top end that seems to go out for miles, or the sonorous bass, or how it steps out of the way of recordings and lets them shine on their own terms.”

“Big, bold, but not brutish”

“The Bia 200 is transparent, powerful, resolving, fun.”

“We’re all wired for the particular sounds that make our particular hearts sing. The Bia 200 is wired in a way that, for the right person, can make that happen.”

By Ken Micallef – Stereophile – March 3, 2023

Read full review

The BIA 200 Select receives the 19th Annual Positive Feedback Writers’ Choice Awards for 2022

| By Editors at Positive Feedback | Issue 124 12-13-2022

By Robert H. Levi

Zesto Audio Bia 200 Select Stereo Tube Amplifier, $15,900

The best amplifier work to date by the amazing George Counnas, CEO and Chief Designer of Zesto Products, with useful features this reviewer has never seen on an amplifier. When you have auto-biasing, you lose a good deal of power and slam. Manual biasing is a pain and often dangerous. The Bia 200 Select offers a convenient, clearly marked selector control, allowing the user to choose the output tubes they desire. Supplied with KT150s, you may load in KT170s, KT120s, or KT88s, current production, or NOS. You retain the full power of the amplifier based on the tube selection and the class A output at all times. I loved the supplied KT150s and enjoyed an extravagant set of four GEC NOS KT88s as well.

With the supplied KT150s the performance was magical. The 100 watts per channel yielded dynamic power and slam which sounded more like 200 watts. No kidding. Extremely realistic imaging and overall definition were presented with a broad soundstage and uber depth. The background was black as outer space, enhancing the dynamic pop of small but important details and nuances. The presentation was organic and elegant, similar to amplifiers triple the cost. As superb as the highs and mids were conveyed, the bass was world-class and competitive with solid state. The Bia 200 Select is the stereo tube amp to own if you are in the market at any price. I heartily give the Reviewers Choice Award to the Zesto Audio Bia 200 Select Stereo Tube Amplifier.

 

 

“Most highly recommended by me, regardless of your predilection for tubes or solid-state.”

By Robert H. Levi – Positive Feedback – 06-03-2022

“….. Bia 200 Select in my highly revealing primary reference system is so neutral, artifact-free, powerful, nimble, delicate, elegant, revealing, and jet-black quiet that your speakers will disappear and present to your ears the performance as recorded. I have never heard such glorious truthful amplification from a 100-watt stereo amplifier in my entire audiophile life,…”

Read full review

The Bia 200 Select Stereo Amp accommodates KT88, KT120, KT150 and KT170.

Read about the sound of the different tubes.

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