Project Description

AllNIC H8000 DHT PHONO PREAMP, £29,000

The world of phono stages has changed much in the last 5 or 6 years. Revolutionary designs from the likes of Allnic and Vitus have mined newfangled possibilities and performance envelopes and shown us that there is so much more to come from our beloved Vinyl sources. Such is the rapid development of the phonostage revolution that the top end of this market sector now comes with a £40,000+ price tag. So much is won or lost here with the handling of this very delicate signal, the phono preamp is a crucial part of the chain and the net effect on the total system cannot be overestimated.

When you know what’s now possible you understand what a tragedy is is that so many owners of great Turntables are piping that precious signal through a “me too” phono preamp of yesteryear which is only a small fraction of the value of the deck. In fact, at Lotus we recommend that the phono stage budget should be close or equal to the budget of the complete turntable. In addition, one should sacrifice the tonearm and cartridge if necessary to book themselves a ticket into this new world of performance.

In 2018 Allnic upgraded the flagship H5000 DHT to the new H8000. This unit sports a host of improved internals over the older model.

‘Introducing perhaps world’s finest Direct Heated Triode Phono Stage, the ‘impossible to build’ ALLNIC H8000. Built to complement our DHT line stages and A10000 DHT amplifiers.’

The H8000 DHT is Kang Su’s reference phono stage and possibly the finest phono preamp the world has ever seen. This new two chassis preamp represents the very frontiers of Kang Su’s prodigious abilities. I personally have never heard coherency or a sense of aliveness from vinyl like this under any circumstance. The Direct Heated Triode sound has a unique way with space and sound pressursation that is difficult to even put into words. If you are serious about Vinyl then I can only implore you to hear this magnificant piece for yourself. The H8000 does some truly remarkable things.

Available in silver or black. 2 year warranty on all Allnic Audio Products , 1 year on factory supplied tubes. Part exchange welcome, just get in touch for in-store and home demo.

LCR type pre-RIAA and RIAA equalisation

Transformer Coupled with the exception of the first gain tube

No negative feedback design with 3 gain stages

A separate power supply unit

High quality MC step-up transformers with Permalloy cores used for dual MC inputs

new Vacuum tube damping technology – Allnic Audio’s patented “Absorb GEL tube damper” technology

Pure Class A operation

Pure balanced operation

The H5000 is fully RoHS compliant

H3000V Turnover options, at: 250Hz, 400Hz, 500Hz RIAA and 700Hz / 4 Roll
off options (at 10KHz): 5dB, 11dB, 13.7dB & 16dB

In the early years of the last century, the directly heated triode (DHT) was invented independently, and almost simultaneously, in the USA and Austria. This simple device, an anode, a cathode and a grid in a vacuum contained in a glass bottle , transformed the world. Over one hundred years later, the very first triode remains a favourite audio amplification device for devoted music lovers worldwide.

Debate about the quality of the DHT’ s sound reproduction potential continues even today. One of the interesting aspects of these debates is the degree to which they ignore analysis of common, fundamental assumptions about DHTs. Those assumptions are based on many decades of circuit and mechanical experimentation and compromise. Indeed, because of the difficulty of using DHTs for audio , many circuit design issues have evolved into assumptions about the audio characteristics of DHTs themselves.

Allnic’s Mr. Kang Su Park has spent a lifetime studying and designing circuits and transformers for use of DHTs in audio reproduction. Mr. Park has questioned basic assumptions about DHTs, reexamined variations of DHT circuit designs, and researched and experimented rigorously. His work has resulted in some remarkable audio power amplification devices. For example, Allnic’s 300B amplifiers produce significantly more power than normally expected . They do this without shortening tube life because the power increase is not achieved by increased bias. In conjunction with an increase in power, Mr. Park’s 300B amplifiers also have exceptional ly low distortion and wide bandwidth.

Mr. Park successfully combined elements of what he learned and invented over decades to the development and production of a pure, direct heated triode (DHT) based amplifier and preamplifier : the A – 5000 and L – 5000, respectively. The main breakthrough was the design of a circuit, valve and transformer combination with astounding measured results . The purity of its square wave reproduction – as perfect as anything he had ever seen from a DHT valve amplification circuit – had him questioning what he was seeing ! Of course, he replicated these tests many times and recorded them and their results before assuring himself that there was no mistake.

With such an unprecedented superior outcome for the circuit design, Mr. Park could not be satisfied placing a DHT stage after one or two stages using indirectly heated triodes. That approach is used in a number of commercially available preamplifiers using DHTs, but it is a compromise. It does not result in PURE DHT amplification . It introduces the characteristics of indirectly heated triode sound into the circuit . The output DHTs are only amplifying a signal already determined by the initial stage indirectly heated triodes. In contrast, Mr. Park has created devices that use DHTs at each amplification stage. In his design, the output stage DHTs do not merely amplify the signal from indirectly heated triode stages. The A – 5000 DHT, L – 5000 DHT , and H – 5000 DHT amplifier, preamplifier and phono – preamplifier are pure DHT , from signal input to output; and now , Allnic has produced the D5000 DHT DAC with a pure DHT analogue output signal path.