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Zesto Audio Leto 1.5 Owner's Manual

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Leto 1.5 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
george@zestoaudio.com
Made in the USA
Using US and Imported Parts
Zesto Audio 2015
1 |
P a g e

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  • Page 1 Leto 1.5 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 george@zestoaudio.com Made in the USA Using US and Imported Parts Zesto Audio 2015...

  • Page 2: Table Of Contents

    I am proud to put my name on it and honored to share this with you. Wishing you many happy years of listening! Sincerely, -- George Counnas, President of Zesto Audio FYI: Zesto is Greek for hot Leto is the mother of Apollo Table of Contents Thank You ……………………………………..

  • Page 3: Table Of Contents

    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. 7. HEAT: Position the unit away from heat sources such as radiators, heat registers, stoves, or other units (including amplifiers) that produce heat.
  • Page 4 17. IMPORTANT SAFETY NOTE: • Before connecting a new product such as the Leto 1.5 Preamp to your audio or home theater system, turn off all other equipment (preferably unplugging them from the AC power source). Many audio components feature automatic turn-on circuits that may activate during an installation, potentially causing damage to electronic components or speakers.
  • Page 5 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.

  • Page 6: Parts And Controls

    Inputs. (BAL) Outputs 4 sets……………………………………………………………… Two sets of RCA SE & 2 sets of XLR transformer balanced outputs Left and right Ground ON/OFF switch ………………………………… Connects or disconnects the ground to the SE outputs Zesto Audio 2015 P a g e...

  • Page 7: Specifications

     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 Zesto Audio 2015 P a g e...

  • Page 8: Tube Layout

     1% metal film resisters throughout  Polypropylene capacitors throughout the audio path Vacuum Tubes  Two (2) Gold pin JJ ECC83S/12AX7  Two (2) Gold pin JJ ECC82/12AU7  High quality gold pin ceramic sockets Zesto Audio 2015 P a g e...

  • Page 9: Hookup, Settings And Adjustments

    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 Preamps with at least 50 hours of factory burn-in. Vacuum Tubes Important! First identify the two types of tubes as they are NOT INTERCHANGEBLE.

  • Page 10: Remote And Front Controls

    You have 5 inputs. #1 is for your cinema bypass. This is a manual control. LED lights: Amber = Mute. Green = Mono. The amber glow of the vacuum tubes is the only visible indication the unit is ON. Zesto Audio 2015 10 | P a g e...

  • Page 11: Tips And Tricks

     Any damage caused by tube rolling is not covered by the manufacturer’s warranty. Power cord  For best performance, the Leto responds better to higher quality power cords. Zesto Audio 2015 11 | P a g e...

  • Page 12: Warranty Information

    The tube will wear out quicker if it’s left on all the time. There is no clear choice which is preferred. 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.

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