Design Philosophy

The Andros Deluxe Phonostage is created from taking the very best attributes from both the Andros 1.2 Phonostage and the Andros Tessera Phonostage while maintaining its own unique sonic personality. We wanted the same footprint as the Andros 1.2 and many of the internal features of the Tessera.

What s Unique

A unique feature of the Andros Deluxe is the use of the 12DW7 tubes in the output circuit. The 12DW7 tube is half a 12AX7 and half a 12AU7. We use the 12AU7 half to drive the output transformers because it is high current and low noise, thus allowing for the most frequently requested feature, a true floating ground balanced output.

It s Quiet, Really!

The extensive grounding scheme, the circuit design and steel enclosure all play a significant role in the noise reduction of the phonostage, so you can hear the quietest passages in your music.

Circuit Topography

The heart of the design is the new main circuit incorporating the same large beefy MC step-up transformers as the Tessera, as well as an entirely new output circuit to drive the balanced output transformers. The Andros Deluxe is built with a passion for Analog, designed with 100% tube circuitry and no solid state devices anywhere in the signal path.

Why Andros

Andros is a Greek island and the home of George s grandmother s family. Andros is now the name of the Zesto phonostage family.

Key Features

The high quality built in MC step-up transformers are designed for better phase linearity. They are also large enough to accommodate all the extra windings and the Mu-metal shielding that reduces noise. This translates to better stereo imaging.
Independent ground switches affect both the MC-XLR and the MC-RCA inputs and reduce or eliminate hum by breaking those pesky ground loops.
Balanced transformers reduce noise in two ways, by providing a true differential signal and allowing the ground to float, making the noise level very low.
The MM-RCA connectors are always grounded to reduce noise from your cartridge.
The dedicated output transformers are driven by the 12DW7 output tubes providing an accurate balanced signal to your preamp.
The output RCA connectors have a floating ground and the XLR are grounded to reduce ground loops.
The tube compliment is a pair of gold pin, high gain, low noise 12AX7 s and a pair of gold pin, high current, low noise 12DW7 s.
Dual mono circuit which creates better stereo separation.
A low Noise level of -80 dBv below maximum output allows the quietest passages of you music to be heard.
10 position MC load 1000, 800, 700, 600, 500, 400, 300, 200, 100, 50 Ohms so you can dial in the best match for your cartridge.
Easily adjustable MC Load on the fly without klicks or pops so you can hear the change.
The gain switch applies to both MC and MM inputs, to better match your cartridges.
100% Analog tube circuitry without any solid state devices in the signal path, because tubes are inherently more musical.
All the RCA and XLR connectors are Gold plated for better conductance and lower corrosion.
Recessed RCA connectors are durable and will hold up to the typical Audiophile who loves to change their configuration.
All switches and knobs are easily accessible, nothing hidden inside to adjust.
Each unit is hand built Made in the USA
50 hour factory burn in on all circuits and vacuum tubes
Elegantly designed 16 gauge steel enclosure to help isolate the electronic chatter from nearby equipment

Specs

Specifications:

Inputs

Two inputs, one MM and one MC
MM Single Ended RCA input
MM impedance 47K Ohms
MM capacitance 220pf
MC transformer Balanced XLR input
MC transformer Single Ended RCA input. Only one MC input can be used at a time
2 independent MC ground lift switches
All input connectors are gold plated
10 position MC load impedance:1000, 800, 700, 600, 500, 400, 300, 200, 100, 50 Ohms
2 Superior quality MC Internal step up transformers
2 position gain switch for High & Low output cartridges
One ground binding post

Outputs per channel

High quality output transformers driven by dedicated 12DW7/ECC832 output tubes
True floating ground, transformer Balanced XLR gold plated outputs
Single Ended gold plated RCA output, with isolated ground
Impedance 150 Ohms
+7 V max output level

Active Components

Two (2) Gold pin JJ ECC83S/12AX7 vacuum tubes with high quality gold pin ceramic sockets
Two (2) Gold pin JJ ECC832/12DW7 vacuum tubes with high quality gold pin ceramic sockets

Power

2 internal linear regulated power supplies, 1 high voltage 250V and 1 low voltage 12V
Power on red LED
ON/OFF switch on left side of unit
Power consumption 28 Watts
Standard 3 pin 15A IEC power connector
Voltage 110/120V AC 60Hz
Optional factory installed 220V or 230/240V AC 50/60Hz

Detailed Specifications

2 position Gain switch
Gain MC input 63 dB and 68 dB
Gain MM input 45 dB and 50 dB
Noise 80 dBv below max output level
Frequency response complies with the original RIAA curve within +or- 0.5 dB
RIAA curve is achieved using a passive filter
No negative feedback
1% metal film resisters throughout
Polypropylene capacitors throughout the audio path
All analog tube circuitry with no solid state devices in the signal path

Other Features

Controls on the rear
Made in the USA using US and imported parts
Each unit is built by hand
50 hour factory burn in on all circuits and vacuum tubes
Dimensions main chassis 17" W X 12" D X 5" H (43cm X 30.4cm X 12.7cm)
Weight 21 lbs (9.53 Kg)
Shipping weight 24 lbs (10.89 Kg), box 21" X 21" X 11" (53cm X 53cm X 28cm)
16 gauge zinc plated steel enclosure
Two year limited warranty
Six months warranty on Vacuum Tubes

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