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Zesto Andros Téssera Reference Phonostage

$18,00000

Key Features For A Quieter and More Musical Phonostage

 

Musical Features

  • Completely new 100% tube analog circuit design with optimized components.
  • Dynamic range increased from 108dBV to 116dBV, so the quietest parts are quieter, louder parts are louder.
  • Loading on the secondary of the MC transformer to capture the most detail from the cartridge.
  • 12 position MC load per channel with more finessed adjustable options like 1000, 800, 700, 500, 400, 350, 300, 250, 200, 150, 100, 50 Ohms
  • Two completely independent dual mono channels, with LED indicators for A and B
  • Gain is improved up to 7dB, which increases the output volume to better match your cartridge to your system.
  • The voltage increases from 250V to 300V for more headroom.
  • The power increases from 52W to 60W to provide more energy needed to reproduce the highs and lows of music accurately.
  • The amps increase from 3.4 A to 8 A to provide more current to the tubes.
  • Maximum output improved from 8V RMS to 12V RMS increases the headroom to allow more musical peaks like trumpet and drums.

Quieter Features

  • New 12DW7 tubes improves the amplification to better drive the output tubes which gives you lower noise, more headroom and lower distortion.
  • Dual chassis external power supply
  • New Toroid design ESP Supply replaces the linear regulated power supply which generates significantly less noise by concentrating the magnetic fields.
  • The dark black noise levels went from -90dB to -95dB.
  • New PCB layout with significantly more grounding for lower noise.
  • Dual chassis with 3-meter RFI filtered umbilical cable to eliminate external noise.
  • Dedicated output tubes driving high quality output transformers to create a true differential low impedance output for lower noise and ideal transfer of power to the preamp.
  • True floating ground, transformer balanced XLR inputs and outputs
  • New grounding throughout to further reduce the internal and external noise.
  • Switching on relays so there’s no digital chatter.
  • Easily adjustable MC “Load on the fly” without klicks or pops so you can hear the change
  • Elegantly designed 16-gauge steel enclosure to help isolate the electronic “chatter” from nearby equipment
  • Ground lift switches on the MC inputs on each channel to prevent noisy ground loops
  • All the RCA and XLR connectors are Gold plated for better conductance and lower corrosion

Other Features

  • Accommodates 4 tonearms, 1 MM and 1 MC per channel
  • All settings are saved when you switch between channels
  • More energy efficient Standby power that reduces the drain from 7w to 0.5W.
  • All switches and knobs are easily accessible, nothing hidden inside to adjust
  • Recessed RCA connectors are durable and will hold up to the typical Audiophile who loves to change their configuration
  • Each unit is hand built “Made in the USA”
  • 50-hour factory burn in on all circuits and vacuum tubes before final testing

Tessera means the number 4 in Greek

 

Specifications:

 

Inputs per Channel

  • Two completely independent dual mono channels, A and B with LED indicator
  • Accommodates 4 tonearms, 2 per channel
  • Separate MM and MC inputs per channel
  • Each channel has independent controls and all selections are saved when you switch between channels
  • Selection switch for MC and 2 position MM 47K and MM 68K
  • MM impedance switch 47K or 68K Ohms
  • MM capacitance 220pf
  • MC transformer Balanced gold plated XLR input
  • MM and MC Single Ended RCA input, gold plated with isolated ground
  • 4 MC ground on/off switch
  • 12 position MC load impedance:1000, 800, 700, 500, 400, 350, 300, 250, 200, 150, 100, 50 Ohms
  • 4 Superior quality MC Internal step up transformers
  • 3 position MC gain switch for High, Medium & Low output cartridges
  • Two ground binding posts

Outputs per channel

  • High quality output transformers driven by dedicated 12AU7/ECC82 output tubes
  • True floating ground, transformer Balanced XLR gold plated outputs
  • Single Ended gold plated RCA output, with isolated ground
  • Impedance 600 Ohms
  • +12V max output level

Active Components

  • Two (2) Gold pin JJ ECC83S/12AX7 vacuum tubes with high quality gold pin ceramic sockets
  • Two (2) JJ ECC832/12DW7 vacuum tubes with high quality gold pin ceramic sockets
  • Two (2) Gold pin JJ ECC82/12AU7 vacuum tubes with high quality gold pin ceramic sockets

Power

  • Dual chassis
  • Power supply with 3 meter DC umbilical cable incorporating special RFI suppression
  • Locking bayonet connector rated for higher voltage and higher current
  • New ESP Supply with 3 Toroid. 1 high voltage 300V and 1 low voltage 12V low power and 1 low voltage 12V high power, housed in the external unit.
  • Power supply dual color LED, yellow for standby and red for ON
  • Main unit push ON/OFF front power switch illuminates a red LED on Channel A or B
  • Power supply standby switch on the front
  • Power supply standby power rating 0.5 Watts
  • Power consumption 60 Watts
  • Standard 3 pin 15A IEC power connector on power supply
  • Voltage 110V – 120V AC 60Hz
  • Optional factory installed 220V – 240V AC 50/60Hz

Detailed Specifications

  • 3 position Gain switch
  • MC input 65dB, 70dB and 75dB or MM input 47dB, 51dB and 55dB
  • Noise  95 dBV below max output level
  • Dynamic range 116 dBV
  • Frequency response complies with the original RIAA curve within +or- 0.5 dB
  • RIAA curve is achieved using a passive filter
  • 1% metal film resisters throughout
  • Polypropylene capacitors throughout the audio path
  • All analog tube circuitry with no solid state devices in the signal path

Other Features

  • Controls on the front
  • “Made in the USA” using US and imported parts
  • Each unit is built by hand
  • 50 hour factory burn in on all circuits and vacuum tubes
  • Dimensions main chassis 17″ W X 15″ D X 5.5″ H, Power Supply 17”W x 8”D x 5”H
  • Weight: Main unit 27 lbs. (12.25 Kg), Power supply 18 lbs. (8.16 Kg)
  • Shipping weight 55 lbs.(24.9 Kg), box 20″ X 20″ X 16″
  • 16 gauge zinc plated steel enclosure
  • Two year limited warranty
  • Six months warranty on Vacuum Tubes