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Se1-GMI 83V

Single Ended Mono Block Power Amplifier

New version already improve quality of previous model by set power to 20W with special single gain topology. Single Ended Mono Block Power Amplifier Se1-GMI 83V has very short signal path without passive components. It means that this circuit contains no coupling capacitors & no inter-stage transformers.


Specially designed hand wounded output transformers improve frequency bandwidth, over standard construction.

Frequency response of our Mono Blocks Se 1 from 5 Hz to 70 kHz is extremely  linear without any sub resonance region.

Se1-GMI 83V has automatic bias circuit means current trough output tube(GMI 83V) is always the same. There is no need for any type of adjustment.

Sound quality is totally independent against power supply instability, because all stages in amplifier have stabilization.

These Mono Blocks require sensitively loudspeaker (over 90dB / 2.83V / 1m @ 8 ohms), but with some of the single ended "friendly" loudspeaker Se1-GMI 83V will bring you great sonic pleasure that only real single ended triode virtues can do.



Technical Specification
Name Value
Type Single Ended Class "A"
Power Output 20 Watts @ 1 kHz 40 ohms or 8 ohms taps
Frequency Response 5 Hz to 70 kHz
Input Impedance 100 kohms parallel with 300pF
Input Sensitivity 1 V RMS for 20 Watts Output @ zero feedback
Rise Time 5.0 microseconds
Noise 108 dB below rated output "A" weighted
Tube Complement 1 x GMI-83V per block
Power Requirement 220 to 240(110 to 120) VAC @ 50 to 60 Hz, 180 VA max.
Dimensions 11.8" (300 mm) wide x 20.4" (520 mm) deep x 10.2" (260 mm) high
NET Weight approx. 60 lbs. (25 kg) unpacked / per piece
TOTAL Weight approx. 154 lbs. (70 kg) packed in two wooden box




Design Features

- single ended type-single ended stage (unique circuit by NAT)
- mono block concept
- absolute zero feedback with ultra low feedback option
- pure class "A"
- all triode output configuration
- short signal path
- no coupling capacitor from input to output
- no interstage transformer
- high current GMI-83V triode connected output tube (military grade, and N.O.S.)
- absolute zero feedback or ultra low feedback option
- hand wound output transformer (custom design for NAT)
- regulated power supply for all stages
- automatic bias control for output tubes
- soft start operate to improve long term stability
- WBT output connectors
- hand assembled modulated chassis
- 10mm thick aluminum front panel (standard black finish, optional silver)
- extensively used computer numeric control machines (CNC)


Specifications are subject of change without notice

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