Zesto Audio

If you want something done right… Digital technology has its place, but true audiophiles know that for the truest, purest sound, nothing beats analog. As I returned “home” to the warm, wonderful world of vinyl, I looked for the gear that would deliver the highest fidelity. I wasn’t satisfied. So I built my own.

Vacuum tubes: everything old becomes new again Vacuum tubes faithfully bring warmth and harmonic tonality like nothing else can. As a young man in England, I designed vacuum tube circuits. I worked for DECCA Navigator — at the time Britain’s largest electronics company — as part of a research and development team designing airborne navigational systems for the Royal Air Force. So I have many years of experience designing, creating and bringing to market high-end electronic equipment. The difference here is that no one’s life is at stake.

I’ve loved music all my life – as a musician, record producer and audio engineer. That makes me fussy about sound. That’s a good thing.

Portfolio

Andros 1.2 Phonostage

Specifications:

 

 

Inputs per channel

  • Separate MM and MC inputs
  • MM/MC switch
  • MM impedance switch 47K or 15K Ohms
  • MM capacitance 200pf
  • MC Single Ended RCA with isolated ground or Balanced XLR3F
  • MC ground on/off switch
  • MC load impedance adjustable 1000, 800, 600, 500, 400, 300, 200, 100, 50, 20 Ohms
  • MC Internal step up transformers
  • MC High/Low switch with ~ -3dB gain for high output MC cartridges

 

Outputs per channel

  • Impedance 10K ohms
  • +6V max output level

 

Active Components

  • Four (4) Gold pin JJ ECC83S/12AX7 vacuum tubes with high quality gold pin ceramic sockets

Power

  • Ground binding post
  • Power consumption 27W , 0 drain when off
  • Voltage 110/120V AC 60Hz
  • Optional factory installed 220V or 230/240V AC 50/60Hz
  • Standard 3 pin IEC power connector
  • ON/OFF power switch conveniently located on the front side
  • Two internal high quality linear regulated power supplies, 250V and 12V

Detailed Specifications

  • Gain MM input 47dB
  • Gain MC input 67dB
  • Noise – 75dBu 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 resisters throughout
  • Polypropylene capacitors throughout the audio path

Other Features

  • “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 17″ W X 12″ D X 5″ H
  • Weight 20 lbs.
  • 16 gauge zinc plated steel enclosure
  • Two year limited warranty
  • Six months warranty on Vacuum Tubes

Key Features

 

  • Allasso in Greek means to change or transform one thing to another.
  • It’s very versatile! Will accommodate the widest range of cartridges with 40 adjustments in Mono and 40 adjustments in Stereo.
  • It’s flexible to allow you to control the 4 step up ratios/gain settings, each having 10 load positions.
  • Designed with the highest quality MC transformers. They are quiet, with extra shielding and large enough with the multiple windings to handle even your high output cartridges.
  • It’s easy to use as all the adjustments are on the front, nothing is hidden inside.
  • All adjustments can be done on the “fly” without clicks or pops.
  • No math skills are required; it’s just you and your ears.
  • Enough adjustments to tailor it specifically to your cartridge or your next one.

 

  • Works with any standard MM input on any phonostage.
  • Designed to reduce “Hum” with 2 ground lift switches and 2 ground binding posts.
  • The Mono switch is specifically designed to reduce “Hum” in your Mono cartridge.
  • A unique feature of the Mono switch is it takes a single input and sends to both outputs.
  • It’s quiet, with extensive grounding in the circuit design and enclosure.
  • RCA connectors are high quality, Gold plated, recessed with an isolated ground.
  • Recessed RCA connectors are durable and will hold up to the typical Audiophile who loves to change their configuration.
  • Elegantly designed 18 gauge steel enclosure to help isolate the electronic “chatter” from nearby equipment.
  • Easy to read large type on back panel.
  • Each unit is hand built “Made in the USA”.

Andros Allasso Step Up Transformer

Specifications:

 

 

  • Frequency response -3dB at 0.4Hz to 100 KHz
  • Phase deviation 1° typical at 20Hz
  • Transformer noise 2 dB @ 20 Ω, 1.8 dB @ 12 Ω
  • Hum rejection                 125 dB @ 60 Hz
  • Voltage gain                 12dB, 16dB, 18dB and 22dB
  • Step up ratios                  1:4,    1:6,    1:8 and 1:12
  • MC load 40 positions in Mono, 40 positions in Stereo
  • Recommended output load 47KΩ @ 200pF (MM input)
  • Inputs Balanced and Single Ended MC
  • Outputs Single Ended
  • Grounds Independent input ground-lift switches
  • Grounds Two ground binding posts
  • Mono Takes one input and sends it to both outputs
  • Dimensions 4”H X 6”W X 8”L (101.6mm X 152.4mm X 203.2mm)
  • Weight 5lb (2.27Kg)
  • Shipping weight 8lb (3.63Kg)
  • Box dimensions 7”H X 9”W X 13”L (177.9mm X 228.6g X 330.2g)

Andros Téssera Phonostage

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 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

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
  • 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 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 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

Leto 1.5 Preamplifier

Specifications:

 

* available with headphone amp or balance control

 

Inputs

  • 5 Inputs
  • 3 sets of Single Ended inputs with an impedance of 100K Ohms
  • 2 sets of true Balanced transformer inputs (pin 2 hot) with an impedance of 10K Ohms
  • Maximum peak input level of 5 Volts RMS

 

Outputs

  • NEW 1/4 TRS inch headphone jack
  • 4 Line outputs
  • 2 sets of true Balanced transformer outputs (pin 2 hot) with an impedance 150 Ohms
  • 2 sets of Single Ended outputs with an impedance 150 Ohms
  • Maximum peak output level of 10Volts RMS +20dB
  • Independent ground lift switches on the left and right Single Ended outputs
  • 1 set of Single Ended Cinema bypass outputs from input #1

 

Vacuum Tubes

  • Two (2) Gold pin JJ ECC83S/12AX7
  • Two (2) Gold pin JJ ECC82/12AU7
  • High quality gold pin ceramic sockets

Detailed Specifications

  • NEW unity gain volume indicator for home theater surround sound integration.
  • Frequency response 10Hz to 50Khz ~ 1dB
  • Distortion ~ 0.02% at 1V RMS input
  • Gain 12dB
  • Signal to noise ~ 100dB below operating level
  • Non inverting output polarity
  • Cross talk >90dB
  • Front panel adjustable balance control
  • Remote control volume, mute and mono
  • Remote bypass switch on rear panel (just in case the remote is misplaced)
  • 1% metal film resisters throughout
  • Polypropylene capacitors throughout the audio path

Power

  • Power consumption 27W, 0 drain when off
  • Voltage 110/120V AC 60Hz
  • Optional factory installed 220V or 230/240V AC 50/60Hz
  • Standard 3 pin IEC power connector
  • ON/OFF power switch conveniently located on the side panel
  • Two internal high quality linear regulated power supplies, 250V and 12V

 

Other Features

  • Each unit is hand made in the USA
  • 50 hour factory burn in on all circuits and vacuum tubes
  • Dimensions 17” W X 12” D X 5” H
  • Weight 23 lbs.
  • 16 gauge zinc plated steel enclosure
  • Two year limited warranty
  • Six months warranty on Vacuum Tubes
  • Recessed RCA and XLR connectors are Gold plated with an isolated ground.
  • All switches and knobs are easily accessible, nothing hidden inside to adjust.

Power

  • Custom Toroidal power transformer with global mains
  • Choke based power supply design
  • 120 Volts AC mains
  • Optional factory installed 220V, 230V, 240V 50/60Hz
  • Power consumption at rated output 300 Watts
  • On/Off switch conveniently located on front panel
  • 3 pin IEC power connector with fuse

Detailed Specifications

  • Dual Mono
  • Auto bias
  • No negative feedback
  • Frequency response 20Hz to 50Khz ~ 2db
  • Total Harmonic Distortion ~ 0.22% at 1W output into 8 Ohms
  • Gain of 23dB
  • Noise level > 0.2 mV RMS into 8 Ohms with input shorted
  • 1% metal film resisters throughout
  • Polypropylene capacitors throughout the audio path

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 66 lbs. (30Kg)
  • 16 and 14 gauge Zinc plated steel enclosure

Bia 120 Class A Stereo Power Amp

Specifications:

 

 

Output

  • Pure Class A
  • 60 Watts per channel
  • 4, 8 and 16 Ohm output taps
  • 8, 5 and 4 Amp Slow blow fuses for outputs
  • Eight 5 way binding post
  • Non inverting output polarity
  • Push-Pull and Ultra-Linear design

 

Inputs

  • RCA single ended inputs Left and Right with an impedance of 100K Ohms
  • Transformer floating XLR balanced inputs Left and Right (pin 2 hot)
    with an impedance of 12K Ohms
  • Independent ground lift switches on left and right balanced inputs
  • 2 Volts RMS input to reach rated output

 

Active Components

  • Matched quad set of four (4) KT88’s vacuum tubes
  • Four (4) Gold pin ECC82s (12AU7) vacuum tubes
  • High quality gold pin ceramic sockets

EROS 300 Class A Monaural Power Amp

Specifications:

 

Output

  • Pure Class A
  • 150 Watts per amp
  • 4 and 8 Ohm output taps
  • 8 and 5 Amp Slow blow fuses for outputs
  • Three 5 way binding post
  • One SpeakOn connector
  • Non inverting output phase polarity
  • Push-Pull and Ultra-Linear design

 

Inputs

  • Transformer floating XLR input
  • Balanced inputs with pin 2 hot, impedance of 12K Ohms
  • Single Ended input, impedance of 100K Ohms
  • XLR ground lift switch on balanced input
  • 1.8 Volts RMS input to reach rated output

 

Active Components

  • Matched sextet, set of six (6) KT88’s vacuum tubes
  • Two (2) Gold pin ECC82s (12AU7) vacuum tubes
  • High quality gold pin ceramic sockets

Power

  • Custom Toroidal power transformer with global mains
  • Choke based power supply design
  • 120 Volts AC mains
  • Optional factory installed 220V, 230V, 240V 50/60Hz
  • Power consumption at rated output 360 Watts
  • Power consumption at idol 348 Watts
  • On/Off switch conveniently located on front panel
  • 3 pin IEC power connector with fuse

Detailed Specifications

  • Monaural
  • Auto bias
  • No negative feedback
  • Frequency response 20Hz to 50Khz ~ 2db
  • Total Harmonic Distortion ~ 0.43% at 1W output into 8 Ohms
  • Gain of 26dB
  • Noise level > 5 mV RMS into 8 Ohms with input shorted
  • 1% metal film resisters throughout
  • Polypropylene capacitors throughout the audio path

 

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 lbs. (29.03 kg)
  • Shipping weight 80 lbs. (36.28 kg)
  • 14 and 16 gauge Zinc plated steel enclosure
  • Two year limited warranty
  • Six month warranty on vacuum tubes