Magneto Evo
By our opinion (from 09.25.) it should be first unit globally that represent most simplicity power amplifier made hybrid technique! It is direct coupled - DC device without any capacitor, resistor, choke or transformer unit on entire signal path. There is no any so called DC servo corrected circuit! It is natural 100% safety signal path without any additional separated support circuit! It should be unique approach for the signal transfer! Signal "can move freely" from input RCA socket to output speaker connectors!
Magneto Evo is an unique mono power (up to 100W) hybrid amplifier made by NAT, based on SINGLE scientific grade gold plated FET and nuvistor triode tube that operate in pure class A, true single-ended mode. Nuvistor triode tube not act as driver or input stage - it is connected directed to mention FET device! To repeat nuvistor tube not act as amplification device!
Single Ended Single Stage Single Device Direct coupled Mono Block Power Amplifier
Magneto Evo represent true single stage direct coupled transformerless and capacitorless power monoblock amplifier! Ref. to mention facts Magneto Evo is fully compatible with single - ended (RCA) type of operation!
Magneto Evo is unique as mention before - there is no input, no driver stage, only one single ultra power gold plated FET transistor with one tube (best nuvistor vacuum tube type that is immune to external vibration - almost zero microphonic device)!
Together there is totally new - unique device - NuFET ( nuvistor-FET) that act as high current "triode" with low distortion and excellent behavior ref. to speakers load! Nuvistor triode tube that is connected in special manner between two electrode (and within itself) of the FET act as linearization device to the whole "system" (new device) - NuFET !
Main facts of Magneto Evo:
- Unique device - High power single NuFET self amplification stage amplifier
- One of (if not) the most compact in class (19"x19"x6.5")
- One of (if not) the most efficiency in class A (220W of power consumption for 100W of pure single-ended class A)
Magneto Evo gives an opportunity to listening the sound on two different mode as high frequency boost mode or standard mode (please read more about this in MANUAL) both of hybryd NuFET type. With power of up to 100W in single-ended configuration there is a capability to drive almost any type of loudspeaker.
Scientific grade output FET device represent high technology in solid state manufacturing. Potential of output single FET reach 1.800W of heat dissipation. Magneto Evo used as low as 12% of max. dissipation cause significantly decrease working temperature for further reliability improvement.
Magneto Evo hand coiled three inductors support NuFET unique operation! Bandwidth reach 5Hz- 100.000Hz as exceptional good flatness for pure single-ended amplifier. Separated output taps (treated with a filter) for 4 and 8 ohms load are realized with laboratory grade connectors.
NOTE: Magneto Evo may drive any load from 1 ohms to over 32 ohms. By specific technical approach special inductor in combination with output NuFET may drive easy almost any type of loudspeaker (with much higher damping factor then standard triode tube single-ended type). Magneto Evo may drive almost all type of speaker.
Power supply section participate in sound quality almost as amplifiers main circuit. Magneto Evo's power unit is designed as high tech totally regulated encapsulated constant current noiseless device. Equivalent available energy from power supply is huge as it is made from audio grade (in total 100.000uF) capacitors. Teflon (PTFE) military grade capacitors is used additionally for the filtration.
Special high curent inductor is used in Magneto Evo as the best noise reduction device in power supply section!
No any adjustment of output NuFET standing current is necessary. Precisely calculated passive self-regulated components with constant current power supply adjust NuFET's standing current.
Wiring by skillfully technicians secure the best quality of signal and power paths inside amplifier - realized with zero printed circuit board! Input signal is transfered with special silver-ofc air dielectric conductor, manufactured by NAT.
Quality of electronic components that is used inside Magneto Evo are at high level - teflon military grade (N.O.S.) power capacitors, entire ofc output hand coiled current inductor, ofc hand coiled inductors, military space grade foil resistor, Vishay space grade foil resistor, industrial high grade capacitors, scientific grade gold plated FET single device semiconductor, laboratory grade connectors...
Magneto Evo work properly at worldwide AC line voltage from 100-250VAC, 50-60Hz (set in factory only).
Design Features
- single - ended single pure class A mono block power amplifier
- genuine design by NAT - NuFET form single (self) amplification stage
- simpliest signal path
- DC coupled (without any transformer, capacitor, choke or resistor on entire signal path)
- scientific grade gold plated FET (one per unit)
- military (N.O.S.) grade nuvistor (miniature metal ceramic triode tube) with over 10.000h of operation
- zero printed circuit board design
- air-core hand coiled choke custom designed for NAT
- silent encapsulated regulated power supply
- over 100.000uF of premium power supply capacitors
- teflon PTFE military grade capacitors in power supply
- star grounding design
- switchable high frequency power output (for better match of different speaker)
- hand assembled all modulated chassis
- high mass laboratory grade output connectors
- gold plated PTFE insulated RCA input connector custom ordered from NAT
- extensively used computer numeric control machines (CNC)
- 4/5" (20mm) thick double aluminum front panel
Technical Specification
Name Value
Type Single Ended Class "A"
Power Output up to 100 Watts @ 1 kHz
Frequency Response 5 Hz to 100 kHz -3dB
THD < 0.07% @ 1W
Input impedance 10 k ohms parallel with 100pF
Input Sensitivity 2.8V RMS for 100 Watts
Gain 17 dB (x 7)
Noise 108 dB below rated output "A" weighted
Tube Complement 6CW4 nuvistor (or similar) - one nuvistor tube per block
Power Requirement 100 to 250 VAC @ 50 to 60 Hz, 220 VA max. (set in factory)
Dimensions 19" (483 mm) wide , 19" (483 mm) deep , 6.9" (275 mm) high
NET Weight approx. 117 lbs (53 kg) unpacked / per piece
TOTAL Weight approx. 150 lbs (68 kg) packed in flight case / per piece