Zesto Audio Leto Ultra Owner'S Manual Download Page 1

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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:[email protected]

Made in the USA

Using US and Imported Parts

Summary of Contents for Leto Ultra

Page 1: ...wner 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...

Page 2: ...about sound That s a good thing Each unit is built by hand with precision and pride to produce the most enjoyable listening experience for you I am proud to put my name on it and honored to share this...

Page 3: ...l Controls Page 10 11 Remote and Manual Controls Page 11 Vacuum Tube Layout Page 12 Hookup Settings and Adjustments Page 13 14 Tips and Tricks Page 15 16 Warranty Information Page 17 What s in the box...

Page 4: ...tructions with the suggested mounting accessory 4 WALL OR CEILING MOUNTING Do not mount the unit on a wall or ceiling 5 WATER AND MOISTURE Do not use the unit near water for example near a swimming po...

Page 5: ...on or against them Pay close attention to cords where plugs enter the AC outlet and where they exit from the unit 12 LIGHTNING For added protection during a lightning storm or when the component is i...

Page 6: ...ing code Questions about cables inside of walls should be directed to a qualified custom installer licensed electrician or low voltage contractor 18 RECORDING COPYRIGHT Recording of copyrighted materi...

Page 7: ...und 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 Presence feature is not engaged completely disconnected from...

Page 8: ...ctory installed 220V or 230 240V AC 50 60Hz Standard 3 pin 15 Amp IEC power connector ON OFF power switch conveniently located on the side panel Two internal high quality linear regulated power suppli...

Page 9: ...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 Single Ended outputs Gain push button sw...

Page 10: ...en you change inputs Presence can be adjusted manually by turning knob or with the remote control Mono is adjusted by Pushing in this knob do not turn to adjust The Mono function indicated by the LED...

Page 11: ...tion Don t turn the knob to manually adjust Mute that will change your inputs Gain LED s will cycle through the three gain positions 3 dB 6 dB and 9 dB Adjust with the remote on the fly The Manual Gai...

Page 12: ...e Mute Preamp defaults to Mute every time it is first turned on and momentarily when you change inputs Mute yellow LED is located on the front panel with the input knob Press the Mute button for ON OF...

Page 13: ...s Warm up Allow at least 10 to 30 minutes for tubes to warm up to get the best performance from the preamp Power Carefully plug in the AC power cable to the preamp first then to your main power Turn i...

Page 14: ...it will sound terrible and wear out the tubes prematurely The sockets are labeled in order to correctly plug in the right tube in the right socket Using the glove provided unpack and carefully plug i...

Page 15: ...struments It does not boost or cut the bass or boost the treble but gently reduces the treble in the range that can become unpleasant The intent of the Presence control is to keep the essence of the m...

Page 16: ...for the output tubes Any damage caused by tube rolling is NOT covered by the manufacturer s warranty Mono for System Set Up I recommend using the Mono function primarily to help you setup and trouble...

Page 17: ...ers the use of12DW7 s and 12AU7 s in their proper positions To return the product it must be packed in its original packaging and returned to Zesto Audio or its authorized representative via insured f...