After a several years in production NAT revised (from September 24) a real high-end amplifier-Transmitter Evo.
Transmitter Evo is a reference point power amplifier made by NAT as pure class A, single – ended type with zero global feedback circuit configuration.
Transmitter Evo gives an opportunity to listening the sound from two different mode - high power setting to 80W or low power to moderate 40W, both of pure direct heated triode (D.H.T.) type. With power of 80W in single – ended configuration there is a capability to drive wide variety type of loudspeaker.
Philips (or equivalent) QB5/1750 type as output device represent high technology in vacuum tube manufacturing. Potential of output tube reach 565W of heat dissipation!
Transmitter Evo used only 35% of max. dissipation that significantly decrease working temperature point for further reliability improvement. Construction of output tube is very robust in mechanical domain resultated in microphonics-free sound reproduction. Special designed pure inox cover cage additionally improved negative vibration feedback effect from the environment, correlate to further increase of micro detail in sound reproduction. For the audiophiles with sensitive loudspeaker Transmitter Evo offer low mode option to lower the output power to 40W that further decreased power consumption of output tube - resulting to much lower heat dissipation.
Input and driver tube (6N6P) in Transmitter Evo is made by military standard, indicated as N.O.S. (new old stock) grade of the highest quality.
Wide-bandwidth output transformer (custom designed for NAT ) is used in Transmitter Evo. Output speakers connectors are realized in laboratory grade style. NOTE: Transmitter Evo may drive speakers from 2 ohms to over 16 ohms. Zero global feedback concept is the best solution for purity of sound reproduction without negative influence from wide variety of speaker impedance.
Power supply section participate in sound quality as well as amplifiers main circuit. Silent power unit is designed for double the power then driver of Transmitter Evo consume. There is a separate voltage regulators for all amplifier stages including the output one. Tonal quality is independent from line voltage fluctation. Soft start tubes filament supply additionally improved Transmitter Evo reliability by avoiding inrush voltage stress during turn-on procedure.
No any adjustment of output tubes standing current is necessary. Automatic bias circuit adjust current through mighty QB5/1750 tube.
Quality of electronic components that is used inside Transmitter Evo are at high level - graphite military grade power resistors, Ohmite resistors, Vishay 0.1% resistors, Cornell-Dublier ultra low ESR capacitors, electrolytic capacitors for 105C of operating temperature, last generation of semiconductors, laboratory grade connectors, pure silver-ofc input wiring…
Transmitter Evo works properly at world wide AC line voltage from 100 – 250 VAC, 50-60Hz (different voltages set in factory only).
NOTE:
-Standard version use pseudo-balanced input
-First step of upgrade : pure-balanced input realised with hand wound nano-crystalline core transformer
-Premium step of upgrade : pure-balanced input realised with hand wound silver-ofc wired nano-crystalline core transformer
NOTE: Protect covers should always be placed over output (big) tubes due to safety!
- single-ended pure class A mono block power amplifier
- zero global feedback
- triode based configuration
- short signal path
- zero capacitor or inter-stage transformer on signal path (direct coupling)
- output section-direct heated triode connected type Philips (or other western manufacturer equivalent) QB5/1750 (6079)(N.O.S.) output tube
- driver section - 6N6P tubes by military grade and (N.O.S.) grade
- wide-bandwidth output transformer (custom designed for NAT)
- silent operation power supply unit
- additional polypropylene capacitors in power supply
- regulated high voltage (HV) power supply for all stages (including the output one)
- regulatedfilament power supply for all stages (including the output one)
- automatic bias current control for the output tube (no additional adjustment necessary)
- soft start operate to improve entire reliability
- hand assembled all modulated chassis
- laboratory grade output connectors
- gold plated PTFE insulated RCA input connectors
- extensively used computer numeric control machines (CNC)
- 3/5" (15mm) thick quadruple aluminum front panel
- cover cage laminate type
Specifications are subject of change without notice
Technical Specification | |
Name | Value |
Type | Single Ended Class "A" Triode |
Power Output | max. 80 Watts @ 1 kHz @ 4 ohms or 8 ohms |
Frequency Response | 8 Hz to 60 kHz @ 4 ohms or 8 ohms |
Input impedance | 100 k ohms |
Input Sensitivity | 1.0 V RMS for 80 Watts |
Gain | 28 dB (x25) |
Noise | 110 dB below rated output "A" weighted |
Tube Complement | 1 x 6N6P, 1 x QB5/1750 (6079) |
Power Requirement | 100 to 250 VAC @ 50 to 60 Hz, 370 VA |
Dimensions | 14.2" (360 mm) wide ´ 25.2" (640 mm) deep ´ 12.2" (310 mm) high |
NET Weight | approx. 89 lbs (40 kg) unpacked / per block |
TOTAL Weight | approx. 220 lbs (100 kg) packed in flight case / per pair |
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