Zesto Audio Leto Ultra II Preamp
Zesto Audio – Leto Ultra II Preamplifier
Zesto Audio Leto Ultra II Preamp DESIGN PHILOSOPHY
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.
- FOCUS ON THE MUSIC
With the Leto in your system it will allow the sonic detail to come through, so you focus is on the music and the hardware will seem to disappear.
- WHAT IS LETO?
In Greek mythology, Leto is the mother of Apollo.
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
3 remote controlled Gain settings of 9dB, 6dB and 3dB
Manual Gain switch on rear panel
Gain setting is saved on each input
Zesto Audio Leto Ultra II Preamp 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
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
Two (2) Gold pin JJ ECC82/12AU7
Two (2) JJ ECC832/12DW7
High quality gold pin ceramic sockets
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 hidden inside to adjust.