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Se2Se GM70

Single Ended Mono Block Power Amplifier

Se2Se GM70 is the latest version of our over decade produced model.Pure direct heated triode amplifier is made by NAT standards – pure class A, parallel single – ended type with zero global feedback circuit configuration.

New Se2Se  give an opportunity to listen favorite music on four different mode.In fact it represent four types of amplifier in one unit – 4ohms dynamic,4ohms electrostatic, 8ohms dynamic and 8ohms electrostatic - pure compatibility with metion impedance/type of loudspeakers.
With power of approx. 60W in single – ended technique there is a capability to drive many types of  modern loudspeaker.
All tubes including the output one are by N.O.S. (new old stock) grade and also by military grade,made strictly to military specification to have high reliability.
Potential of output tube is 125W per each of heat disipation while we use only 50%-55% of it.
It dramatically decrease working temperature point – means further improvement of amplifiers reliability as well as tube life expectancy.
Construction of output tube GM70 is very robust also in mechanical domain – means there is no high level of microphonic effect with negative influence to the sound reproduction.
Special designed glass cover tube cage additionally improve negative vibration effect from reflection in listening room that also positive increase quality of sound reproduction.
Hand connected widebandwidth output transformer (custom designed for NAT ) is used in this unit.
Bandwidth is from 8Hz – 90.000Hz. That is extremly good result for single - ended operation mode yet with zero global negative feedback nature.
By specific technical approach mention output transformer in combination with output tube GM70 may drive easy almost any type of loudspeaker with damping factor better then in most push-pull tube configuration.
Zero global feedback concept is well known also as the best solution for purity of sound reproduction without negative influence from wide variety speaker impedance – means good for driving all type of speaker equally (electrostatic or dynamic type).
Power supply section also speak for itself.Main transformer is designed for over double the power then Se2Se consume (over 600W) with totally silent operation. There is separate voltage regulators also in zero feedback manner for all amplifier stages including the output one.On such a way sound quality is totally indipendent from line voltage instability.Equivalent enegry from power supply is huge, example for bass responce down to 20Hz, it is equal to no less then 8000 Joules (8kJ) of related capacitor type energy.
Soft start additionally improving reliability of entire amplifier by avoiding voltage stress during turn-on procedure.
There is no need for any adjustment from time to time of output tubes standing current.Electronic circuit automatically adjust current through GM70 output tube type no matter of tube duration – means constant current in time domain –  from the brand new to the end point of tube life.
Quality of electronic material that is used inside Se2Se is on high-end level -  Polystirene military grade capacitors, 0.1% Vishay resistors,electrolitic capacitors for 105C of working temperature,last generation of IXYS semiconductors,WBT connectors…
Amplifier works properly at all world wide AC line voltage from 100 – 250 VAC, 50-60Hz (set in factory).



Technical Specification
Name Value
Type Single Ended Class "A"
Power Output 60 Watts @1kHz  4 or 8 ohms
Frequency Response 8 Hz to 90 kHz -3dB ;   20Hz to 20kHz +/-0.2dB @ 8 ohms
Input Impedance 100 kohms parallel with 100pF
Input Sensitivity 1.8V RMS for full power output.    Gain:22dB (X12.2)
Damping Factor >10 (@zero global feedback)
Noise 100 dB Below Rated Output “A” weighted
Tube Complement 1x 6N6P-I, 2xGM70
Power Requirement 110 VAC or 220 VAC @ 50 to 60 Hz, 270 VA (set in factory)
Dimensions 11.8" (300 mm) wide ´ 19.7" (500 mm) deep ´ 10.2" (260 mm) high
NET Weight approx. 73 lbs (33 kg) unpacked / per unit
TOTAL Weight approx. 172 lbs (78 kg) packed in two wooden boxes

*Technical specifications are subject of change without notice


Design Features

- ground zero output transformer technology
- single ended pure class “A”  type
- zero global feedback design
- triode based configuration
- direct heated GM70 (N.O.S.) (military grade) output triode based configuration
- mono block configuration
- direct coupled driver for the output stage (without capacitor or inter stage transformer)
- driver based on high impulse current triodes 6N6P-I (N.O.S.) (military grade)
- hand connected output transformer designed for NAT
- custom power transformer designed for NAT
- compatibility with electrostatic and dynamic type of loudspeakers
- high temperature grade capacitors in power supply
- all regulated power supply (including for the output stage)
- soft start operate
- WBT output connectors
- hand assembled modulated chassis
- engraved 3/8" thick aluminium front panel (standard black finish, optional silver)
- extensively used computer numeric control machines (CNC)
 

*Design features are subject of change without notice

 

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