Elekit TU-8900 - 300B/2A3 SE Power Amp Kit
Elekit TU-8900 - 300B/2A3 SE Power Amp Kit
The TU-8900 is the only single-ended triode kit that natively supports both the 300B and the 2A3 — and switches between them automatically. Power it up with either tube installed and the amplifier detects which one it’s dealing with, correcting filament voltage and B-power supply without any manual adjustment. Two of the most revered output tubes in the world. One amplifier.
“Looks every bit like a high-end commercial amplifier. PCB and parts quality are outstanding — easily among the best I’ve seen in a DIY kit. Clean, dynamic, and wonderfully musical.”
— Moetaz Attalla ★★★★★
The TU-8900 builds to a genuinely premium result: extremely quiet operation, with the rich midrange and controlled bass that define the 300B available from day one, and the delicate expression of the 2A3 a tube swap away. Three independent 5-star reviews. Lundahl amorphous OPT upgrade available.
Lundahl LL2785C AM output transformers (note: replaces standard OPTs)
This upgrade for Elekit TU-8900 uses specifically designed Lundahl output transformers (OPT) featuring amorphous cores rather than pure iron and upgraded coupling capacitors with Mundorf top of the line oil impregnated silver/gold capacitors for a superb listening experience.
An amorphous core overcomes a feature of iron cores, that of magnetic saturation. The Lundahls replace the stock OPTs that would otherwise ship with the amp.
The quality of a tube amplifier’s OPTs is extremely important, especially so for single-ended amplifiers. Design is all important as an air gap in the transformer is needed to prevent transformer core saturation, which would cause audible distortion and other problems. Herein lies the challenge: having an air gap lowers the inductance, which compromises low-frequency response yet to increase the inductance requires adding more windings, which adversely affects the high-frequency response.
The silver/gold oil Mundorf capacitors is featured in this version of the TU-8900 due to its wonderful natural tone and exceptional micro dynamics. The high-purity silver and gold is used for the capacitor coating and the winding is impregnated with a special oil developed in an exhaustive series of experiments and listening tests.
Sweden's Lundahl is a specialist designer and manufacturer of high performance transformers.
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