Zesto Audio

Explore Zesto Audio



We have looked for a long time to find a line of quality US made tube gear that we think is really special. Zesto Audio is just that. It is an American made line of very high quality separates that competes wiht the best products made. We have been following George & Carolyn since they introduced their first phono stage 10 years ago and have been consistantly impressed. They now have a full line with a world class tube preamp, two state of the art Class A tube power amplifiers as well as 3 phono stages and a superb Step up Transformer. 

 

Leto Ultra II Preamplifier

State of the art stereo preamplifier
$10.900.00
 
 
Leto 1.5 Preamp
 

In the Feb 2020 review by Positive Feedback Robert Levi says:

"The Zesto Audio Leto Ultra Preamplifier is Zesto Audio's ultimate statement of preamplifier perfection. It is made 100% in America. The all-tube unit is chock full of useful and creative features a dedicated audiophile and music lover will enjoy, styling which would be right at home at MoMa, a flexible remote control without flaws, and Zesto's best overall musical performance to date. Sonically superior to anything solid state I have ever heard, you would have to spend a ton more to equal its high definition and many features in the tube world."

"No tube preamp at any price is quieter or has better facilities to manage hum and noise in your entire system like the Leto Ultra. The Leto Ultra is one superior innovative product, and right at home in the Zesto line. My highest buy recommendation!"

Here are a few other quotes from the review:
"George created a preamplifier that is neutral with a bullet, remotely changeable to enhance lesser recordings or sources, has remotely adjustable outputs that provide unity gain with no editorializing, and uses fully balanced tube circuitry throughout...all on one normal-sized chassis. Plus, it is a 100% ultra-quiet advanced tube circuit super easy to roll. Joining the Bia amplifier and the Andros Deluxe phono, the new Leto Ultra preamplifier premiers in excellent company—the three most innovative and dramatic advances to date of AFFORDABLE state of the art musical reproduction in the home."

"The Leto Ultra soundstage is grand. From ceiling to floor and wall to wall, and front to infinity, the speakers disappear and the music flows. With a state-of-the-art source, expect a state-of-the-art performance from the Leto Ultra."


The new 2019 Ultra version replaced the extremely well reviewed Leto 1.5 and the new 2020 Leto Ultra II is even better with upgraded power dupply:

Zesto has announced their newest, all analog product - the Leto Ultra II preamplifier, which replaces the Leto 1.5 and original Leto (which is now discontinued). Of particular interest are the 'tone controls', the new Presence Control. George Counnas says, “This was born out of my frustration that the more resolved my system became, many of my favorite new and old recordings, became unlistenable due to the inconsistencies of the Mastering, regardless of the source. I realized the part that bothered me was the harmonic balance of the mid and high frequencies, the region that can be considered too bright, edgy, aggressive or fatiguing.” The 6 position Presence control easily allows you to dial it back without any technical knowledge required, just listen for the most enjoyable tonal balance for every song. George says, “It works great for your mood too, because sometimes I’m in the mood for lots of detail and sometimes I want it laid back and I can do it from my sofa with the remote.

Top 7 New Features of the Leto Ultra Preamplifier

1. New upgraded circuit topology delivers more musical detail with a tighter bass. It has a robust input design to handle higher output sources. Dynamic range is expanded by new circuitry that produces a higher output before distortion. Still 100% Analog tube circuitry throughout the signal path.

2. New tube configuration with the 12DW7 allows for the smoothest transition from the input section to outputs, providing the cleanest and most musical path for your signal.

3. New 3 gain positions 3dB, 6dB and 9db make the Leto Ultra one of the most versatile preamps available. It easily accommodates the many volume
differences from all your sources such as a high output DAC, as well as a low output phono. Your preferred gain settings are saved on each input and can be conveniently adjusted “on the fly” with the Remote or Manual control.

4. New 6 inputs for your many sources include 3 true dedicated transformer Balanced Inputs and 3 Single Ended. All are high quality, gold plated connectors for better conductance and less corrosion for the most reliable connection.

5. New 6 Position Presence Control adjusts the harmonic balance in the mid and high frequencies allowing you to dial back what you may consider to be too bright, edgy or aggressive. This is an exceptionally useful tool that addresses the inconsistencies of mastering from any source. It’s easily adjustable “on the fly” with your remote or manually for each piece of music.

6. New 9 button Remote control to conveniently adjust “on the fly” settings including Input, Volume, Presence, Mute, Mono and Gain. In case you misplace your remote, all features can be adjusted manually.

7. New LED indicators on the front panel clearly display all your adjustments.

In the first review of the original Leto Positive Feedback summed with:

"The Zesto Audio Leto 1.5 Vacuum Tube Preamplifier bests the 1.0 in features and in every parameter I can think of. It hosts improvements in the highs, mids, and bass which will mightily please audiophiles. It has improved definition and neutrality. It makes the music live in your high-end system. Plus, it is not more expensive, just improved and perfected! It even sports an excellent headphone output jack on the front panel for added pleasure. The 1.5 is a real keeper in my book and worthy of any system no matter how expensive.
This new Ultra preamp is another step forward in sounics and features

My congratulations to Zesto Audio. They did it again! Most highly recommended."

Stereophile summed the original Leto review with:

"I was very impressed with the Leto. Zesto Audio has produced a well-made, stunningly gorgeous product that gave me hours of pleasure as I listened to a wide range of recordings. In this crazy market of ever-increasing prices, a tubed line stage with so many strengths, so few and negligible weaknesses, and that can produce this level of musical satisfaction without costing somewhere in five figures, is commendable. In that sense, the
Zesto Leto line stage is a veritable bargain."


Other Important Features you may want to know about:

  • No solid state devices are used for switching the signals, only relays. This reduces noise and provides the most musical detail.
  • The wide frequency response allows you to hear the finest passages in your music.
  • Left and Right ground switches allows you to control the grounding of the outputs.
  • The low impedance output transformers prevent the Power amp from affecting the line amp, thus providing the strongest and cleanest signal to your power amplifier.
  • Recessed RCA and XLR connectors are premium quality, gold plated, with an isolated ground.
  • All connectors are durable and will hold up to the typical Audiophile who loves to change their configuration.
  • Automatically goes to mute when turned on or off, preventing any pops which could damage your speakers or surprise the hell out of you.
  • The remote Mono feature helps you to trouble-shoot your system, especially phase issues, center balance and sound stage.
  • Each preamp receives 50 hours of factory burn in on all circuits and vacuum tubes.
  • Elegantly designed 16 gauge zinc plated steel enclosure to help isolate the electronic “chatter” from nearby equipment.
  • On/Off power switch conveniently mounted on front side panel.
  • Each unit is hand built “Made in the USA”.

 

Bia 120 Class A Stereo Power Amp

60 watts/ch stereo tube amplifier

$11,000.00
 
More power


 

Bia 120 Class A Stereo Power Amplifier
Scot Hull – Part-Time Audiophile – March 7th 2015

….”The amplifier has more than enough power to drive the snot out of all but the most absurd loudspeakers. Chances are, you’re gonna love the way it sounds. Take that, add a healthy dose of style, and you’ve got yourself something marvelous.” 

Bia 120 Stereo Power Amplifier
Paul Seydor – The Absolute Sound – April 7th 2014

“Is the Bia perfect? Well, of course, nothing’s perfect, but no matter what I threw at it, I couldn’t make it sound anything less than beautiful…”

Bia 120 Class A Amplifier
Positive-Feedback Online – November 2013 – Robert H. Levi

“…I have never heard a better amplifier in my reference system, tube or solid-state. It is the best new tube amplifier to reach the market in the last five years priced under $50,000.” Read Robert H. Levi’s full review in Positive Feedback on line.




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

Detailed Specs

  • 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

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

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

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

 

Andros 2 Phonostage

$5,200.00
 
Andros 1.2 Phonostage


The new Andros 2 verson uses an upgraded power supply

The Best of the Best!   Andros 1.2 Phonostage
The 12th Annual PFO Writers’ Choice Awards for 2015 by Mark Pearson


“The Andros 1.2 just does everything right. It is dynamic, it has gorgeous tonal colors, it throws a big and deep soundstage, and it’s super quiet. .”
Andros 1.2 Phonostage
Mark Pearson – Positive Feedback – August 11th 2015
“I have had lots of phono sections in my system(s) over the years, but I have never had one this good or this quiet.” Read entire review
 
Andros 1.2 Phonostage- Positive-Feedback Online – April 2015…..
Robert H. Levi

“The new Zesto Audio Andros 1.2 Phonostage Preamplifier clobbers the original, and may just be the best piece of audio gear designed by George Counnas to date. ”

Stereophile gives the Andros Phonostage a 2013 Class A Rating
Michael Fremer – Stereophile Analog Corner – March 2013

“…The Zesto had an addictive, warm overall sound, with plenty of impact, detail and grace. It’s among the more enjoyable and satisfying phono preamplifiers I’ve auditioned at any price …”


Key Features

  •  The Circuit is specifically designed to provide sufficient amplification to match your cartridge with the rest of your system.
  •  Each unit is hand built “Made in the USA”.
  •  50 hour factory burn in on all circuits and vacuum tubes.
  •  A low Noise level of -75 dBu below maximum output allows the quietest passages of you music to be heard.
  •  The output circuit is designed to drive your cables and isolates the output from the influence of the next stage.
  •  RCA connectors are high quality, Gold plated, recessed with an isolated ground.
  •  Isolated ground RCA connectors plus the Ground On/Off switch will allow you to choose the best ground configuration.
  •  Recessed RCA connectors are durable and will hold up to the typical Audiophile who loves to change their configuration.
  •  All switches and knobs are easily accessible, nothing hidden inside to adjust.
  •  Two position MM switch 47K and 15K Ohms to accommodate more cartridges.
  •  10 position MC load switch from 20 to 1000 Ohms and more in the sweet spot above 200.
  •  Accommodates both high and low MC output cartridges
  •  Elegantly designed 16 gauge steel enclosure to help isolate the electronic “chatter” from nearby equipment.
  •  On/Off power switch conveniently mounted on front side panel
  •  Easy to read large type on back panel

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
EROS 300 Class A Monaural Power Amps
$21,900.00 the pair
 
EROS 300

Key Features

  • Class A topology is the most musical of all amplifier designs because it has the lowest distortion.
  • Unlike solid state, this tube amp efficiently transfers power by matching the output transformer to the impedance of your speakers using 4 & 8 Ohm taps.
  • Two parallel options for your speaker cables; the binding posts or the SpeakOn connector.
  • The Eros 300 is easy to use. There are no adjustments or tweaking with Auto Bias technology on the output tubes. It’s safe, consistent and the settings are always perfect so you can relax and enjoy the music.
  • Transformer balanced XLR input offers true noise cancelling and rejection as well as ground isolation from the preamp.
  • Should you need to eliminate a hum? The Eros 300 has a XLR ground switch installed for your safety. This eliminates the dangerous temptation to lift the ground from the mains.
  • The combo of Push-Pull – Ultra Linear output circuit design gives you more power & lower distortion.
  • No Negative Feedback in the circuit design provides better dynamic range because it doesn’t compress the music.
  • Non Inverting Phase Polarity retains the directional information from the original source which gives your system punch.
  • A robust choke based power supply creates maximum immediate power with no compression.
  • Custom Toroid power transformer provides lower noise with plenty of available power.
  • The circuit design creates low noise levels with a wide frequency response. You will notice this in the really dark, quiet passages in your music.
  • Gold pin sockets are more reliable because gold doesn’t oxidize when it heat cycles.
  • A matched sextet (6) output tubes provides a synchronized balance for the lowest distortion and maximum output of power.
  • An extensive grounding scheme is designed into the power supply, wiring and all tube circuitry.
  • Elegantly designed, heavy duty 14 & 16 gauge zinc plated, fully grounded steel enclosure isolates external noise and vibration.
  • All fuses are easily accessible
  • It’s ready to enjoy with 50 hours of factory burn in on all circuits and vacuum tubes.
  • Each unit is hand built “Made in the USA”

Specifications per Amp

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

Detailed Specs

  • 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

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

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

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
 

Andros Allasso Step Up Transformer

Create the perfect match between your cartridge and any phonostage with 40 options!

$3,295.00
 
More power

Michael Fremer | Stereophile | April 2019 

…”Zesto’s George Counnas designed the Allasso (Greek for change or transform) to be both incredibly flexible and easy to use…

Best of all, rather than overload your primary and secondary coils, Counnas says that “it’s about the best sound, not the math.” He suggests beginning with the middle load position (5). I’d still use math to set the gain, based on the cartridge’s output, but you’re free to experiment while listening. Turning the Andros Allasso’s knobs produced no thumps or bumps through my speakers….”

 

 

Zesto Andros Allasso Step Up Transformer – Quite Possibly The Last SUT You’ll Ever Need!

Michael Corsentino | Positive Feedback | March 2019

“From my cold, dead hands!” - Charlton Heston, describing the only way anyone would be able  to take away his guns. I’ll state right up front that after a month in my reference system that’s exactly how I feel about the Zesto Andros Allasso step up transformer. In fact I was completely smitten with this little sonic marvel in a matter of hours, we bonded that quickly…”



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”.



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

When only the best will do
$12,000.00
 
Andros Tessera Phonostage

Zesto Audio Andros Téssera Phonostage: Quadruple Your Input

“…the Zesto Audio Andros Téssera phonostage embodied a certain level of surefooted calmness. Easy to operate in daily use, it appeared to be a quiet and solidly designed piece of electronics. It didn’t seem to give any more than it took from the cartridge by adding something obtrusive to the signal. It was warm and full-bodied in a preferred way, but there was nothing thick or sluggish about it—the sound retained timing and pacing along with its portrayal of musical content. With the capability to connect up to four tonearm/cartridge combinations, the user has the option to quadruple his analog front-end input choices for musical playback from a single phonostage. A look and listen are encouraged.”

Read the full article in The Absolute Sound at; http://www.theabsolutesound.com/articles/zesto-audio-andros-tessera-phonostage/

Andre Jennings | The Absolute Sound | Dec. 3, 2018





Key Features

  • Two completely independent dual mono channels, with LED indicators for A and B
  • Accommodates 4 tonearms, 1 MM and 1 MC per channel
  • All settings are saved when you switch between channels
  • Dual chassis with external power supply
  • 3 meter umbilical cable incorporating special RFI suppression to provide lower black levels
  • Dedicated high quality output transformers drivin by output tubes
  • True floating ground, transformer balanced XLR inputs and outputs
  • 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
  • Easily adjustable MC “Load on the fly” without klicks or pops so you can hear the change
  • 100% tube circuitry in the signal path without any solid state devices
  • All switching is done with relays
  • Ground lift switches are on each channel to prevent noisy ground loops
  • All the RCA and XLR connectors are Gold plated for better conductance and lower corrosion
  • 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
  • Elegantly designed 16 gauge steel enclosure to help isolate the electronic “chatter” from nearby equipment
  • Each unit is hand built “Made in the USA”
  • 50 hour factory burn in on all circuits and vacuum tubes
Andros Tessera Phonostage back