Single Ended Mono Block Power Amplifier

 


 
After "Big" Magma NAT introduced "Small" Magma M high power single ended direct heated triode amplifier. At almost near half the price of "Big" Magma there is over 90% of sound quality from Magma M. Magma M may drive equally both dynamic or electrostatic modern type of speakers.

NAT Audio has  review for Utopia Direct coupling Line Stage and Magma M Mono Block Power Amplifier in Italian audio magazine "Fedelta" April 2010. edition.

Click here to download original review (Italian) (256 kB)

Click here to download original Cover (329 kB)

Click here to download review (English) (640 kB)

Click here to download review (German) (630 kB)
Technical Specification

Type

Single Ended Class "A"

Power output

80 Watts @ 4 & 8 ohms; 1 kHz

Frequency response

5 Hz to 80 kHz -3dB

Input impedance

100 kohms

Input sensitivity

1 V RMS for full power output

Gain

Approx. 27 dB

Rise time

4 microseconds

Noise

105 dB below rated output "A" Weighted
Phase status Inverting ( 180o )
Tube complement 6N2P-EV, 1 x 250 TH(TB4/800)
Power requirement 110 VAC or 220 VAC @ 50 to 60 Hz, 300 VA
Dimensions 11.8" (300 mm) wide ´ 25.2" (640 mm) deep ´ 14.2" (360 mm) high
NET weight approx. 88 lbs (40 kg) unpacked / per piece
TOTAL Weight approx. 110 lbs (50 kg) packed / per piece

Design Features

- Single Ended pure class A mono block power amplifier
- Power industrial type direct heated triode - 250TH or TB4/800(N.O.S.)
- DC coupled circuit (only output transformer on signal path)
- CE comfortable regarding maximum DC operating voltage
- 80 W of pure class A @4ohms or @8ohms
- zero global feedback configuration
- high capacitance in power supply with high energy storage
- custom designed power transformer of 1000W encapsulated-low density
- custom designed output transformer of 1000W encapsulated- last generation
- double stabilisation of high voltage for driver tube

- 6N2P-EV N.O.S. grade tube for driver purposes

- full automatic bias with automatic-adjust (no any adjustment).

- variable bias (two mode with 30W or 80W of output power)

- balanced DC power to supply filament of output tube
- regulated DC power to supply filament for driver tube

- WBT output connectors

- all aluminum modulated chassis with double 20mm thick front panel


*Specifications are subject of change without notice