Inovative Audio Manufacture

Reference Zero Feedback Balanced Line Stage

Magnetic is a newest reference point line stage made by NAT standards – transformer coupled, class A with zero feedback circuit configuration. Special selected vacuum tube is used - represent high technology in industrial tube manufacturing.


Both packs of active devices are of high grade and have high reliability.

Hand crafted wide-bandwidth output transformer (custom designed for NAT ) is used in this unit.

Open bandwidth of output transformer is from 1Hz – 700.000Hz. That is extremely excellent for high direct current single ended transformer coupled operation mode. Even the square wave response is near perfect that indicate high quality amplification. Output has separate selectable tap for single ended and balanced operation!

By specific technical approach mention output nano-crystalline core transformer with special selected vacuum tube may easy drive any type of interconnect even very long length cable.

Zero feedback concept is well known also as the best solution for purity of sound reproduction without negative influence from feedback circuit. There is no any capacitor on direct or indirect signal path - resulted to absolute zero feedback operation.

Attenuation is based on high reliability relay (pure silver with gold plated contacts) network that is computer controlled. There is 96 position of attenuation. Single laboratory grade resistor is on the signal path at any attenuator step.

Magnetic is equipped with remote control unit made from solid block of aluminum.

Power supply section also speak for itself. High capacity (approx. 500.000 uF of capacitance) supply is used as the best solution for power supply section. There is more then 550 joules of energy!

It is true dual mono construction - totally separate one channel from another.

There is separate voltage regulators for all additional (for non signal path) stages.

Sound quality is totally independent from line voltage instability and from negative influence of wide variety noise that could be coupled across.

There is a built-in measurement for total hours of preamplifier accumulated work (tube duration) that is presented by led diodes universal meter (led indicator on front panel).

Quality of electronic material that is used inside Magnetic is on high level - special selected superminiature military grade tubes, 0.1% with 5ppm Vishay resistors, high quality nano-crystalline transformer core, electrolytic capacitors of very high capacitance, gold plated teflon isolated connectors, silver-ofc PTFE input wiring…

Magnetic works properly at all world wide AC line voltage from 100 – 250 VAC, 50-60Hz (set in factory).

Technical Specification
Name Value
Type Zero Feedback Pure Tube
Operation Pure Single-ended (RCA) or Pure balanced (XLR)
Frequency Response 2 to 350 kHz, -3 dB; 20Hz to 20kHz, +/-0.05dB
Noise 100 dB IHF reference to 1V
Gain 12dB (X 4) XLR output
THD & N <0.04 %
Input Impedance >20 kohms @ balanced (XLR) input
Output Impedance <300 ohms @ RCA, <500 ohms @ XLR
Stereo Separation near infinite (dual mono)
Polarity Status Invert phase (180 degree)
Power Requirements 100VAC to 240VAC (50 to 60 Hz), max. 20 VA
Dimensions 19" (483 mm) wide ´ 16” (400 mm) deep ´ 7.2" (185 mm) high
NET Weight Approx. 48 lbs (22 kg) unpacked
TOTAL Weight Approx. 70 lbs (32 kg) packed

Design Features

- transformer coupled circuit (without any capacitor on direct or indirect signal path)
- absolute zero feedback circuit
- approx. 500.000uF of capacitance in analog power supply section
- pure dual mono construction
- custom designed wide-bandwidth nano-crystalline core output transformers (with near perfect square wave response)
- vacuum special tubes by military spec. as well as N.O.S. grade
- vacuum tubes of N.O.S. (new old stock) grade-booster PY88 type
- separate transformators for digital control and analog supply
- relay network attenuation (shunt type realised with 56 relays)
- remote control made from solid block of aluminum
- all modulated chassis
- front panel made from 15mm thick aluminum material
- built-in measurement for total working hours of line stage
- teflon insulated gold plated connectors

Specifications are subject of change without notice


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