Se1

Single Ended Mono Block Power Amplifier

Download Single Ended Triode Ampifier Survey (357 kB, PDF Format) written by Mr. Scot Markwell and read his impressions about Se1. Review was published in AVguide in June 2003.

MkII version already improve quality of previous model by increasing power to 35W with special driver, super tube 6N30P-DR(military grade).

Single Ended Mono Block Power Amplifier Se1 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 9 Hz to 60 kHz is extremely  linear without any subresonance region.

Se1 has automatic bias circuit means current trough output tube(VT-4-C) 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 stabilisation.

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

NAT Audio has review for Plasma Line Stage and Se1 Mono Block Power Amplifier in Netherlands audio magazine "Music Emotion" nov/dec 2006. edition.

Click here to download original review (Dutch) (454 kB)

Click here to download review (English) (390 kB)

Technical Specification

Type

Single Ended Class "A"

Power Output

35 Watts @ 4 & 8 ohms, 1 kHz

Frequency Response

9 Hz to 60 kHz @ 8 ohms taps

Input Impedance

100 kohms

Input Sensitivity

0.9 V RMS for full power output35 Watts Output @ 8 ohms

Gain 25db(x18.5)

Rise Time

6.0 microseconds

Noise

99 dB below rated output

Tube Complement

1 x 6N2P-EV, 1 x 6N30P-DR, 1 x VT-4-C

Power Requirement

110 VAC or 220 VAC @ 50 to 60 Hz, 190 VA

Dimensions

11.8" (300 mm) wide x 24" (610 mm) deep x 10.2" (260 mm) high

NET Weight approx. 67.5 lbs. (30.5 kg) unpacked / per piece
TOTAL Weight approx. 106 lbs. (48 kg) packed / per piece

Design Features

- single ended type
- mono block concept
- pure class "A"
- all triode configuration
- short signal path
- no coupling capacitor
- no interstage transformer
- direct heated VT-4-C (General Electric or United Electronic - USA) triode output tube (military grade & new old stock)
- absolute zero feedback or ultra low feedback option
- hand wound output transformer (custom design for NAT)
- power transformer (custom design for NAT)
- hi quality long life driver tubes 6N2P-EV & 6N30P-DR (super tube)
- all polypropylene capacitors in power supply for VT-4-C
- regulated power supply for all stages (also for VT-4-C)
- soft start operate
- WBT output connectors
- hand assembled all aluminum modulated chassis
- engraved 3/8" thick aluminum front panel (standard black finish, optional silver)
- extensively used computer numeric control machines (CNC)


Specifications are subject of change without notice