NAT Audio Symmetrical preamp silver Mint customer trade-in

  
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Mint customer trade-in   
NAT Audio Symmetrical preamp in silver     
Excellent condition, only used for one week.  Awesome sounding preamp.

Balanced Dual Mono Zero Feedback Vacuum Tube Line Stage

NAT
Audio introduced tube balanced preamplifier called "Symmetrical New".
New line stage is completely in dual mono topology also with zero feedback all
triode vacuum tube design.

 

 There is
twelve(12) tubes that works in perfect symmetry, means six(6) per each channel.

Design based on fact
that preamplifier may work perfect in both type of operation-balanced (xlr) and
single ended (rca).

Also, attenuation
network is realized with 56 high reliability silver contact relay. Only one
(vishay) resistor is always to the signal path (shunt type)!

"Symmetrical"
may drive any known power amplifier no matter of type or internal impedance
(compatible with input impedance of 600ohms). It also means that interconnect
length between pre and power amplifier may be of enormous value.

Remote control as
standard option is made from solid block of aluminum.

Technical Specification

Name

Value

Frequency Response

0.07 Hz to 300 kHz – 3 dB ; 20 Hz
to 20 kHz ± 0.01 dB

Noise

< -95 dB "A" weighted
@ 1V rms

Gain

15.5 dB (X 5.6 Phase status:
non-inverted (0 degree)

THD & N

< 0.03 %  20 Hz to 20kHz @
1V rms

Input Impedance

> 10 kohms single ended: >20
kohms balanced

Stereo Separation

> 100 dB @ 1 kHz

Tube Complement

2 X OA 2, 2 X PY88, 2 X 6N1P-EV, 2
X 6N2P-EV  &  4 X 6N6P-I

Output Impedance

< 70 ohms on single ended
;  <140 ohms on balanced

Power Requirements

110 VAC or 220 VAC @ 50 to 60 Hz,
max. 100 VA

Dimensions

19" (483 mm) wide ´ 18"
(455 mm) deep ´ 6.5" (165 mm) high (max.dimensions)

NET Weight

approx. 38 lb. (17 kg) unpacked

TOTAL Weight

approx. 58,5 lb. (26,5 kg) packed
in wooden box

 

Design Features

- full dual mono construction with 12 tubes (6
per each channel)

- zero feedback design

- all triode pure class A configuration

- double regulated, hybrid output high precision power supply

- high current tube 6N6P double triode (military grade)

- plasma effect are used for stabilization in power supply realized with OA 2
tube (new old stock)

- vacuum tube power supply rectification with high-voltage PY88 booster diode

- high quality single audiophile grade capacitor of high capacitance on signal
path

- polypropylene capacitors in high voltage power supply

- two low density silent power transformers each per channel for analog stages
custom made for NAT

- soft start operate