The Fulianty Audio ST‑18 is a premium high‑end tube headphone amplifier designed for audiophiles seeking the most natural, musical, and dynamic sound from their high‑impedance planar‑magnetic or electrostatic headphones. As an OTL single‑ended (output‑transformer‑less) tube headphone amplifier, the ST‑18 delivers an open, three‑dimensional soundstage with exceptional clarity, micro‑detail, and low‑end control. The amplifier is built around selected NOS (new old stock) vacuum tubes from the golden age of tube production, carefully matched and installed in a simple, direct‑coupled signal path with only four components, ensuring minimal coloration and maximum musicality.Thanks to its Class‑A triode topology, pure point‑to‑point (P2P) hand‑soldered construction, and the absence of global negative feedback, the ST‑18 excels at reproducing vocals, acoustic instruments, and orchestral music with a rich, warm, and yet highly transparent character. The robust power supply and anode‑voltage delayed switching system, based on a vacuum tube, guarantee stable operation, long tube life, and excellent channel separation for a true high‑end headphone listening experience.Beyond the circuitry, the ST‑18 stands out with its modern industrial design. The solid chassis is built from non‑magnetic, CNC‑machined aluminium parts with a powder‑coated surface, while the corten steel front panel is individually hand‑made and finished, giving the amplifier a unique and timeless look that fits perfectly into any high‑end audio setup. This combination of audiophile‑grade tube electronics, a minimalist OTL design, and artisanal craftsmanship makes the Fulianty Audio ST‑18 one of the most sought‑after vacuum tube headphone amplifiers for discerning headphone‑fi enthusiasts.
Whether you are looking for a high‑end tube headphone amplifier to drive Sennheiser HD800/HD800S, HiFiMAN, Audeze, Stax, or other high‑impedance cans, the ST‑18 provides effortless dynamics, deep bass, and a refined midrange that brings your recordings closer to the original live performance. As a high‑end German hi‑fi retailer, we offer the Fulianty ST‑18 with full technical support, priority shipping, and expert headphone‑amp consultation for audiophiles in Germany and across Europe.
Pure Design Topology
Class A triodes
OTL SE circuit (output transformer less & single-ended)
P2P soldering installation (point-to-point)
No global circuit feedback
Robust power supply
Anode voltage delayed switching system based on an electron tube
AC vacuum tube heating
Only four components in the signal path
High-End selected audio components
NOS (new old stock) carefully chosen from well-known manufacturers fabricated during the golden age of vacuum tube production
Highly refined supporting components: resistors, capacitors, source-selector, potentiometer, sockets, induction components in the hi-end specification
Modern Design
Solid chassis, built from non-magnetic aluminium parts fabricated by CNC with a powder-coated finish
Corten steel front panel, individually hand-made and finished
Box content
amplifier ST-18 with NOS tubes
power cord PC-18
product guide
certificate and warranty card
more infos about Fulianty Audio