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Allnic Audio L-8000 DHT Forforstærker
Til salg179.000 kr.
Beskrivelse
Forforstærker, Andet, Allnic L-8000 DHT, Perfekt, Meget mere information her: https://allnicaudio.com/product/l-8000-dht/
The Allnic L-8000 DHT preamplifier is the improved successor to the L-5000 DHT, which was the world’s first commercially produced, pure DHT preamplifier.
All signal circuits with DHT (Direct Heated Triode)
Line output transformer coupling
No negative feedback design
Advanced tube technology voltage regulation
61-step Silver Contact Constant Impedance attenuator
Technical Specification:
Inputs 3 x RCA, 2 x XLR
Outputs 1 x RCA, 2 x XLR
Input Impedance 10k ohms (RCA, XLR)
Frequency Range 20 Hz to 20 kHz flat, 16 Hz to 75 kHz (-3dB)
Voltage Gain +18dB
THD (1kHz, 1V RMS) 0.06% at 0.3V, 0.16% at 1.0V
S/N ratio -90dB (CCIR, 1 kHz)
Maximum Output 20V RMS (non clipping)
Output Impedance 120 ohms
Power Consumption 30W
Tubes 3A/110A x 2 (1st gain stage); 3A/109B x 2 (2nd output-gain stage); 7233 x 2 (voltage regulator); 5654 x 2 (voltage error detector)
Fuse 2A/230V
Dimensions 430mm (16.9291 inches. W), 351mm (13.811 inches. D), 211mm (8.3inches. H)
Weight 19.1 kg (42 lbs) unpacked
The L-8000 DHT has the following features:
• Line output transformer coupling – The L-8000 DHT is “transformer coupled”, using transformers that have been upgraded from those in the L-5000 DHT. In tube amp circuitry, there are two coupling methods; one is capacitor coupling and the other is transformer coupling. Capacitor coupling is the traditional, low cost method. It is somewhat stable but transfers only voltage, not wattage (i.e., not real energy). With transformer coupling, about 90% of real wattage is transferred (there is still a transformer loss of about 10% of wattage – voltage is not affected).
Transformer coupling is superior to capacitor coupling. However, all the advantages of transformer coupling depend on the quality of the transformer and on the choice of tubes. Allnic Audio manufactures its own transformers and uses what it views to be the best core material, Permalloy. Allnic Audio’s unprecedented, wide (16Hz ~ 75kHz, -3db), low distortional, and ultra-flexible (up to 50kHz square wave response) output transformer helps Allnic Audio to realize the ideal transformer coupled preamplifier. Of course, gain tubes are also carefully selected for three critical factors for function with the Permalloy output transformers: high gm, low internal resistance and high mu.
• Constant and low output impedance – One of the benefits of transformer coupling is that it facilitates constant low output impedance. Low output impedance is critical to the design of a good preamplifier. The L-8000 DHT has a 120 ohm (120Ω) constant output impedance at all frequencies. In capacitor coupling (C-R coupling), a “cathode follower circuit” is usually used to lower output impedance. Unfortunately, this method of lowering output impedance is accompanied by high distortion and has an “L” shaped output impedance curve. Please compare the two graphs below, especially for low frequency response.
• No negative feedback design
• Advanced tube technology voltage regulation – For quieter and more dynamic operation, the L-8000 DHT has an ultra-high speed automatic voltage regulation circuit, utilizing vacuum tubes. This also protects the amplifying tubes from change in the AC line supply and copes with any abrupt, internal current demand.
• New vacuum tube damping technology – Allnic Audio’s patented “Absorb GEL tube damper” technology prevents harmful vibrations from reaching the signal / gain tubes and, therefore, prevents microphonic noise propagation in the tubes. The Allnic Audio Absorb Gel damper technology effectively solves a problem that plagues most tube, and especially DHT, amplification systems. Provided other tube components do not introduce microphonic noise into your system, with the Absorb Gel damping system, you will enjoy a degree of transparent sound that will surprise and please you.
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| Annonce-ID | 2982553 |
|---|---|
| Sidst redigeret | 21.2.2025 kl. 11:23 |
