Zesto Audio Ultra II Leto Tube Line Stage Preamplifier

Home > Products > Amplifier, Preamplifier - Tube >

Zesto Audio Ultra II Leto Tube Line Stage Preamplifier

Zesto Audio Ultra II Leto Tube Line Stage Preamplifier

$10,895.00 Free Shipping!

Free Shipping!
Loading...

Zesto Audio Ultra II Leto Tube Line Stage Preamplifier

$10,895.00 Free Shipping!

Free Shipping!
Loading...

  • Description


     

    Design Philosophy (By George Counnas, the designer)

    "The preamp is the unsung hero of your system. Like a great actor who never seems to be “acting”, it does all the work without getting noticed. As an engineer, my goal is to deliver the most pristine signal from your audio sources to your power amps
    without coloration.

    "My own setup features lots of audio sources, so I wanted lots of inputs and a variety of gain settings. I also wanted it simple to use, so every adjustment is remote or manually controlled.

    "A unique feature I added is the Presence Control, which was born out of my frustration after finding some of my favorite recordings became unlistenable the more resolved my system became, regardless of the source. This new feature deals with the harmonic balance of the mid and high frequencies. Now I can easily adjust the balance for every song.

    "I have been enjoying this in my own listening and am certain you will too."

     

    Top 7 New Features of the Leto Ultra Preamplifier

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

    2. The 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 being 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.

     

    Other Important Features -

    • 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 allow 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 troubleshoot 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.
    • The on/Off power switch conveniently mounted on the front side panel.
    • Each unit is hand-built “Made in the USA”.


    Reviews:

    Positive Feedback: "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!" - Robert Levi


    Specifications -

    Inputs

    6 Inputs with remote or manual controls
    3 sets of true transformer Balanced inputs (pin 2 hot) with an impedance of 10K Ohms
    3 sets of Single-Ended inputs with an impedance of 100K Ohms
    The maximum input level of 7 Volts RMS

    Outputs

    4 Line outputs
    2 sets of true transformer Balanced outputs (pin 2 hot) with an impedance 150 Ohms
    2 sets of Single Ended outputs with an impedance 150 Ohms
    The maximum peak output level of 13 Volts RMS
    2 Independent ground lift switches on the left and right outputs

    Presence

    6 position remote or manual Presence control
    Presence  0,-1, -2, -3, -4, -5 (low pass shelf)
    0 = Not engaged
    -1 = 13Khz and above
    -2 = 8Khz and above
    -3 = 4Khz and above
    -4 = 2Khz and above
    -5 = 1KHz and above
    When the unit is turned on, or you switch inputs, the presence control will go to “0”
    Presence control defaults to 0 which disengages from the circuit

     Gain

    3 remote controlled Gain settings of 9dB, 6dB, and 3dB 
    Manual Gain switch on the rear panel 
    The gain setting is saved on each input

    Detailed Specifications

    Remote control Input, Volume, Mute, Mono, Presence, and Gain settings
    All adjustments can be operated manually (just in case the remote is misplaced)
    Frequency response 10Hz to 40Khz ~ 2dB
    Distortion ~ 0.013% with 1V RMS input
    Signal to noise ~ 100dB below operating level
    Non-inverting output polarity
    Cross talk >90dB
    1% metal film resistors throughout
    Polypropylene capacitors throughout the audio path

    Power

    Newly designed internal power supplies using Toroidal transformers, 1 high voltage 300V and 1 low voltage 12VPower consumption 30W, 0 drain when off
    Voltage 100 to 120V AC 60Hz
    Optional factory-installed 220V to 240V AC 50/60Hz
    Standard 3 pin IEC power connector
    ON/OFF power switch conveniently located on the side panel

    Vacuum Tubes

    Two (2) Gold pin JJ ECC82/12AU7
    Two (2) JJ ECC832/12DW7
    High-quality gold pin ceramic sockets

    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 28 lbs.
    Shipping weight 30 lbs.(12.70 kg)
    Shipping box: 21”w x 21”d x 11”h (53.34cm x 53.34cm x 27.94cm)
    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 is hidden inside to adjust.

     

     

Product Ratings

Average Rating
No rating found.

Choose How Many Stars (5 Being the best)

Zesto Audio Ultra II Leto Tube Line Stage Preamplifier

$10,895.00 Free Shipping!

Free Shipping!
Loading...

Description


 

Design Philosophy (By George Counnas, the designer)

"The preamp is the unsung hero of your system. Like a great actor who never seems to be “acting”, it does all the work without getting noticed. As an engineer, my goal is to deliver the most pristine signal from your audio sources to your power amps
without coloration.

"My own setup features lots of audio sources, so I wanted lots of inputs and a variety of gain settings. I also wanted it simple to use, so every adjustment is remote or manually controlled.

"A unique feature I added is the Presence Control, which was born out of my frustration after finding some of my favorite recordings became unlistenable the more resolved my system became, regardless of the source. This new feature deals with the harmonic balance of the mid and high frequencies. Now I can easily adjust the balance for every song.

"I have been enjoying this in my own listening and am certain you will too."

 

Top 7 New Features of the Leto Ultra Preamplifier

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

2. The 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 being 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.

 

Other Important Features -

  • 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 allow 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 troubleshoot 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.
  • The on/Off power switch conveniently mounted on the front side panel.
  • Each unit is hand-built “Made in the USA”.


Reviews:

Positive Feedback: "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!" - Robert Levi


Specifications -

Inputs

6 Inputs with remote or manual controls
3 sets of true transformer Balanced inputs (pin 2 hot) with an impedance of 10K Ohms
3 sets of Single-Ended inputs with an impedance of 100K Ohms
The maximum input level of 7 Volts RMS

Outputs

4 Line outputs
2 sets of true transformer Balanced outputs (pin 2 hot) with an impedance 150 Ohms
2 sets of Single Ended outputs with an impedance 150 Ohms
The maximum peak output level of 13 Volts RMS
2 Independent ground lift switches on the left and right outputs

Presence

6 position remote or manual Presence control
Presence  0,-1, -2, -3, -4, -5 (low pass shelf)
0 = Not engaged
-1 = 13Khz and above
-2 = 8Khz and above
-3 = 4Khz and above
-4 = 2Khz and above
-5 = 1KHz and above
When the unit is turned on, or you switch inputs, the presence control will go to “0”
Presence control defaults to 0 which disengages from the circuit

 Gain

3 remote controlled Gain settings of 9dB, 6dB, and 3dB 
Manual Gain switch on the rear panel 
The gain setting is saved on each input

Detailed Specifications

Remote control Input, Volume, Mute, Mono, Presence, and Gain settings
All adjustments can be operated manually (just in case the remote is misplaced)
Frequency response 10Hz to 40Khz ~ 2dB
Distortion ~ 0.013% with 1V RMS input
Signal to noise ~ 100dB below operating level
Non-inverting output polarity
Cross talk >90dB
1% metal film resistors throughout
Polypropylene capacitors throughout the audio path

Power

Newly designed internal power supplies using Toroidal transformers, 1 high voltage 300V and 1 low voltage 12VPower consumption 30W, 0 drain when off
Voltage 100 to 120V AC 60Hz
Optional factory-installed 220V to 240V AC 50/60Hz
Standard 3 pin IEC power connector
ON/OFF power switch conveniently located on the side panel

Vacuum Tubes

Two (2) Gold pin JJ ECC82/12AU7
Two (2) JJ ECC832/12DW7
High-quality gold pin ceramic sockets

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 28 lbs.
Shipping weight 30 lbs.(12.70 kg)
Shipping box: 21”w x 21”d x 11”h (53.34cm x 53.34cm x 27.94cm)
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 is hidden inside to adjust.