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Vacuum Tube Phono Stage

Signature Phono

Vacuum based inverse network (Vacuum RIAA by NAT) Tube Phono Stage

NAT set a new standard in Phono state-of-the art product by new approach - Vacuum based Inverse RIAA network in model Signature Phono New - Vacuum RIAA. Standard inverse RIAA network is based on resitor or even better inductor as main part in the signal path! NAT use vacuum field medium instead. Signature Phono stage contains 10 vacuum triode tubes in full zero feedback configuration.

 

Signature Phono is entirely fully balanced phono stage from input (for MC mode) to output! There is possibility to change from balanced to unbalanced type of operation (on rear panel).

Input AC power is filtered and fully regulated by cord-conditioner separate unit of Signature Phono. Power supply of extremely high energy (over 320J) is used to supply low noise high gain 6HM5 triode tubes! It is tubes of N.O.S. (New Old Stock) grade. Premium genuine Oyaide input power connector is used as well! There is no need to use any additional power cord! Separate cord-conditioner replace power cord in best possible manner! There is internal input main phase detector (dectetion of L) as well. It is in form of led indicator positioned on separate cord - conditioner chassis!

Hand coiled both output transformers as well as inter-stage chokes (4 separated magnetic unit) form in Signature Phono simple as possible signal path! Magnetic material that is used inside unit is the best possible by today audiophile standard -nano - crystalline!

Special constructed output transformer is reconfigurable from pure single-ended (RCA) to pure balanced (XLR) operation in Signature Phono!

Low output types of MC cartridges  are boosted by NAT premium fully balanced hand coiled nano-crystalline set-up transformers.

Selectable load resistance (in six step - 50,100,200,500,1k,2k) for the different cartridge is available!

Signal-to-noise ratio is excellent due to fact that input MC transformers are almost noiseless!

With output impedance of 300 ohms Signature Phono may easy drive any long length interconnect cable.

High quality gold plated teflon (PTFE) isolated connectors, both input and output are used.

Each Signature Phono is hand crafted and fine adjusted device with burn in test period of min. 100 hours.

Quality of electronic components that is used inside Signature Phono are at high level - military grade 0.1% tolerance capacitors, high grade with over of 320J energy from main capacitor, Vishay 0.1% resistors, electrolytic capacitors for 105C of operating temperature, silver-OFC wired input for MC stage...

 Signature Phono device works properly at world wide AC line voltage from 100 - 250 VAC, 50-60 Hz (different voltages set in factory only).

To repeat, Signature Phono confirm original innovative approachof NAT globally.

 

 

Technical Specification
Name Value
Frequency Response 10 Hz to 100 kHz
Noise < -84 dB "A" weighted
Gain 42 dB MM standard + 6 dB MM HIGH + 14db MC ( in TOTAL 62 dB or 56 dB as option)
RIAA Accuracy ± 0.4 dB
Channel Unbalance < 0.1 dB
THD & N < 0.1 %
Input Impedance Selectable (50,100,200,500,1k,2k) for MC, 47k as standard for MM
Stereo Separation > 96 dB
Tube Complement 6HM5 low noise triode
Phase Status (non inverted) 0 degree
Output Impedance < 300 ohms @ 1kHz
Power Requirements 100 VAC to 240 VAC @ 50 to 60 Hz, max. 60 VA
Dimensions

Main unit: 19" (483 mm) wide x 16.5" (420 mm) deep x 6.6" (168 mm) high

P.S. unit: 10.8" (275 mm) wide x 6.9" (175 mm) deep x 2.8" (70 mm) high

NET Weight approx. 53 lbs. (24 kg) unpacked with cord-conditioner
TOTAL Weight approx. 75 lbs. (34 kg) packed

 

Design Features

- vacum based inverse RIAA network-original approach by NAT
- zero feedback (unique construction)
- vacuum tube triode based phono stage
- 7 (seven) separate inductors - chokes are used inside device
- very high energy (over 320J) powered supply
- 6HM5 triode of N.O.S. grade vacuum tubes
- premium nano-crystalline input step-up transformers (fully balanced input capability) (2/unit)
- premium nano-crystalline inter-stage chokes (2/unit)
- premium nano-crystalline output transformers (fully balanced output capability) (2/unit)
- selectable load resistance for different cartridges for MC stage
- separate cord-conditioner with premium Oyaide power connector
- soft start operate
- gold plated PTFE insulated RCA jack with gold plated XLR balanced connectors
- hand assembled all modulated chassis
- anodised 0.6"(15mm) thick aluminum front panel
- extensively used computer numeric control machines (CNC)

Specifications are subject of change without notice