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Zesto Andros Téssera Phonostage


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A little background info…

The Andros Téssera is built with a passion for Analog, designed with 100% tube circuitry and no solid state devices anywhere in the signal path, as well as all the switching is done with reed relays. This phono stage has a new circuit design that is partnered with significantly upgraded larger MC step-up transformers to capture the most delicate signals in the grooves.





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 150 Ohms
  • +8V max output level

Active Components

  • Four (4) Gold pin JJ ECC83S/12AX7 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


  • Dual chassis
  • Power supply with 3 meter DC umbilical cable incorporating special RFI suppression
  • Locking bayonet connector rated for higher voltage and higher current
  • 3 internal linear regulated power supplies, 1 high voltage 250V and 2 low voltage 12V
  • 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 7 Watts
  • Power consumption 52 Watts
  • Standard 3 pin 15A IEC power connector on power supply
  • Voltage 110/120V AC 60Hz
  • Optional factory installed 220V or 230/240V AC 50/60Hz

Detailed Specifications

  • 3 position Gain switch
  • MC input 60dB, 65dB and 70dB or MM input 40dB, 45dB and 50dB
  • Noise – 90 dBu below max output level
  • Frequency response complies with the original RIAA curve within +or- 0.5 dB
  • RIAA curve is achieved using a passive filter
  • 1% metal film resistors 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 25 lbs (11.34 Kg), Power supply 17 lbs (7.7 Kg)
  • Shipping weight 53 lbs (24 Kg), box 20″ X 20″ X 20″
  • 16 gauge zinc plated steel enclosure
  • Two year limited warranty
  • Six months warranty on Vacuum Tubes
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