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Related Manuals for Zesto Audio Leto Ultra
Summary of Contents for Zesto Audio Leto Ultra
- Page 1 Leto Ultra Vacuum Tube Preamplifier Owner’s Manual Please read carefully before installing and operating this equipment Zesto Audio 3138 Calle Estepa, Thousand Oaks, California 91360 805-807-1840 www.zestoaudio.com, Email:george@zestoaudio.com Made in the USA Using US and Imported Parts P a g e...
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Page 2: Thank You
Dear Music Lover, I wanted to personally thank you for your purchase of my Leto Ultra Preamp. I have loved music all my life – as a musician, record producer and audio engineer. That makes me fussy about sound. That’s a good thing. -
Page 3: Table Of Contents
Hookup, Settings and Adjustments……………………….Page 13 - 14 Tips and Tricks ……………………………………………….Page 15 & 16 Warranty Information………………………………………..Page 17 What’s in the box Leto Ultra Preamplifier Leto Remote Control 2 12AX7/ JJ ECC83s Vacuum Tubes 2 12DW7/ JJ ECC832 Vacuum Tubes ... -
Page 4: Warning And Caution
Do not spill liquid of any kind on the unit. If water or any metal object (such as a paper clip, coin, or staple) accidentally falls inside the unit, disconnect it from the AC power source immediately and contact Zesto Audio for further instructions. - Page 5 least six inches of clearance above the unit, 0.5 inch below and an opening behind the unit for airflow. Do not place the unit on a bed, sofa, rug, built-in bookcase, or rack without adequate ventilation. 9. GROUNDING OR POLARIZATION: As a safety feature, the unit may be equipped with a polarized alternating current line plug in which one blade is wider than the other and has an additional grounding blade.
- Page 6 19. FCC INFORMATION FOR USER: • CAUTION: Any changes or modifications not expressly approved by Zesto Audio could void the user's authority to operate the equipment. • These limits are designed to provide reasonable protection against harmful interference in a residential installation.
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Page 7: Specifications
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 ... - Page 8 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 ...
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Page 9: Rear Panel And Controls
Rear Panel Inputs and Controls Power ON/OFF switch: Turns the unit ON/OFF (located on side panel). Inputs 1, 2 & 3: RCA single ended (SE) High quality recessed gold pin connectors Inputs 4, 5 & 6: XLR True floating balanced transformer inputs. (BAL) ... -
Page 10: Front Panel Controls
Adjust the Gain so your normal operating volume is around 12 o’clock. Center Knob is the Presence Control & Mono The “0” position is the Leto Ultra Preamp without any Presence features engaged. In “0”position Presence is not connected in the circuit. -
Page 11: Remote And Manual Controls
Inputs and Gain settings are linked and will remember your last Gain settings for each input that has been set for more than 30 seconds. This is a useful feature when you have as an example a high output DAC and low output phono. ... -
Page 12: Vacuum Tube Layout
Remote Remote has 9 buttons with 6 functions: Volume, Input, Gain, Presence, Mute, & Mono. Mono: The Mono LED is located on the front panel, by the presence control knob. The function is on when the Yellow LED is illuminated. This function adds Left plus Right inputs. Press the Mono button for ON/OFF. -
Page 13: Hookup, Settings And Adjustments
Before you start you will need: RCA or XLR Interconnect cables from your sources and to your power amp. Proper Care of the Leto Ultra Preamp Very Important Read This First The simple rule to remember is to “turn on the preamp before turning on your power amp and turn off the power amp before turning off the preamp.”... - Page 14 Like all high end audio equipment, this Vacuum Tube Preamp can take 200 hours to break in. For circuit testing and quality assurance, Zesto Audio ships all the Leto Ultra Preamps with at least 50 hours of factory burn-in. Vacuum Tubes ...
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Page 15: Tips And Tricks
Tips and Tricks How to use the Presence control The Presence feature adjusts the harmonic balance in the mid and high frequencies in 5 positions, allowing you to dial back what might be considered too bright, edgy or aggressive. This is an exceptionally useful tool that addresses the inconsistencies in mastering from any digital or analog source. - Page 16 Volume Control / Gain Adjustment The unit is designed to work ideally with the volume control between 10 and 2 o'clock position for normal operating volumes. If the volume control is at 4 o’clock or 8 o’clock you may want to set the gain to a different setting. ...
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Page 17: Warranty Information
Warranty All Zesto Audio equipment is covered by a 2 year limited warranty for parts and labor to cover defects in materials and workmanship and 6 month warranty on the original vacuum tubes from date of purchase. To obtain this original owner warranty the completed warranty registration card should be emailed to the factory within 15 days from date of purchase.
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