Zesto Audio Bia 200

Modern Tube Design for the 21st Century Listener Bia 200 Select Class A Stereo Power Amp 100 Watts per channel with a 3 Position Bias Switch 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 Vacuum Tubes