Andros Téssera Reference Phonostage by Zesto


Zesto has released another incredible new phonostage with a completely tube based analog circuit, improved amplification, and increased dynamic range. The Andros Téssera is handmade in the USA, and is the ultimate in phonostage technology.

Andros Téssera Reference Phonostage

The key features of the Andros Téssera are a musical sound delivery and incredibly low noise. Zesto has increased the dynamic range from 108dBV to 116dBV, allowing the quietest sounds to build into fantastic crescendos. With the whisper-like silence possible with the Téssera, noise is kept to a minimum using 12DW7 tubes, a new PCB layout, and dedicated output tubes. These changes have caused black noise levels to decrease to -95dB.

Other changes include a maximum output increase, a 12 position MC load per channel feature, and two completely independent dual mono channels. Combined, these features create an incredibly musical and quiet phonostage, and the best one Zesto has created yet.

Téssera VS Téssera Reference


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


• 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

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