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The NAT Audio Plasma R is a dual mono line stage tube preamplifier designed to provide high-quality audio performance. It features a frequency response from 0.25 Hz to 400 kHz (-3dB), ensuring a wide and accurate sound spectrum. The tube complement includes four 6N30P-DR tubes and two each of OD 3, EZ80, and 6N2P-EV tubes. It offers a gain of 17.6 dB (x7.6) with a phase inversion of 180 degrees. Noise levels are very low at less than -104 dB (A weighted at 1V rms), and total harmonic distortion plus noise (THD & N) is under 0.03% from 20 Hz to 20 kHz at 1V rms. The input impedance is greater than 20 kOhms, stereo separation exceeds 100 dB at 1 kHz, and output impedance is less than 300 ohms at 1 kHz. The unit requires 110 or 220 VAC power and consumes a maximum of 100 VA. It weighs 35 lbs and measures 19 x 18 x 5.7 inches (WxDxH). The Plasma R is praised for its dynamic capability, delivering strong bass and clean, fast transients without overhang, making it suitable for complex rhythms and large dynamic swings. It buffers sources effectively, providing a friendly load and low output impedance to drive most amplifiers. The power supply and polypropylene capacitors contribute to its ability to source current quickly and maintain performance under demanding conditions. The preamplifier comes with a one-year warranty on parts and labor and ninety days on tubes.
Amplification power output and characteristics
Analog signal output specifications
Size, weight, and appearance
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The closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The Line 3's signal-to-noise is 100 dB against the Plasma R Dual Mono Line Stage Tube's 104 dB, its thd 0.010% against 0.030%, and its weight 27.5 kg (61 lbs) against 15.88 kg (35 lbs). Both share output voltage (1.0V RMS).
The ATC-2's signal-to-noise is 90 dB against the Plasma R Dual Mono Line Stage Tube's 104 dB, its thd 0.010% against 0.030%, its output impedance 200Ω against 300Ω, and its output voltage 2.0V RMS against 1.0V RMS.
The DiaLogue Premium Power's signal-to-noise is 94 dB against the Plasma R Dual Mono Line Stage Tube's 104 dB, its thd 0.100% against 0.030%, its output voltage 0.9V RMS against 1.0V RMS, and its output impedance 100000Ω against 300Ω.
The kW Hybrid Line's signal-to-noise is 105 dB against the Plasma R Dual Mono Line Stage Tube's 104 dB, its thd 0.007% against 0.030%, its output impedance 0.5Ω against 300Ω, and its input impedance 500Ω against 20000Ω.
Balanced Audio Technology VK-50SE
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