Name: Takatsuki TA-274B
Brand: Takatsuki
Price: 1200.0 USD
Availability: InStock

Specifications

Configuration - Directly heated twin diode rectifier

Filament Voltage/Current - 5V / 2A AC

Maximum Plate Voltage - 660 V

Maximum DC Output Current - 225 mA

Maximum Transient Current - 2.5 A (less than 20 msec)

Peak Plate Current - 700 mA

Lifespan - ~ 7,000 hours*

*The TA-274B tube offers ~ 7,000 hours of lifespan when used with a first capacitor no larger than 10 μF after the rectifier. Staying within this spec ensures long-term, stable performance in your audio equipment.

Included in the box

Takatsuki TA-274B tube, single or matched pair

Test report x 1

Storage box x 1

Unprecedented High-Precision Vacuum Tubes Reincarnated by Japanese Semiconductor Manufacturer

Takatsuki Electric Co. Ltd., Japan’s exclusive vacuum tube manufacturer for High-End Audio, boasts a distinguished 60-year legacy in semiconductor and electronic device production. Originally producing vacuum tubes for CRTs, Takatsuki supplied the renowned “National” valves, still esteemed by audiophiles today.

In 2008, the company revived its heritage with the “Reincarnation of Tubes” project, employing advanced precision technology to recreate the iconic WE300B and WE274B tubes. These modern valves embody exceptional quality and precision, crafted from carefully selected materials and rigorously tested in Takatsuki’s Japanese facility to ensure superior performance.

Quest for the Best Available Quality

Takatsuki proudly manufactures the TA-300B tubes entirely in Japan, emphasizing meticulous craftsmanship and premium components.

For this reissue, every part and production step was thoroughly reexamined to enhance precision, including the creation of new dies for the base and a shift to a sleek black finish. Assembled exclusively by skilled artisans in cleanroom environments, each tube undergoes rigorous manual inspection rather than automated mass production. This dedication reflects years of relentless pursuit of unparalleled quality, prioritizing excellence over cost-efficiency.

Experience a fresh, modern analogue sound that transcends nostalgia, embodying Takatsuki’s deep expertise and unwavering commitment to supreme audio performance.

Quality Management Throughout Production Process

Takatsuki enforces rigorous quality control at every stage of production, meticulously inspecting all components under magnification.

To prevent oxidation, rinsed parts are promptly stored in nitrogen-filled boxes and must be assembled within two days. Each tube features a laser-engraved serial number on the upper-plated mica, enabling traceability of all manufacturing data in case of quality concerns.

Takatsuki carefully monitors even minor details, such as spark-free welding, that may not directly impact sound quality but contribute to overall excellence. These cumulative refinements ensure consistently precise production with virtually no defects or lot-to-lot variation.

Characteristics

Glass Material and Lead−Free Solder

The Kovar glass is totally free from lead thus friendly to environments that stands even the constant heat exceeding 300 ℃ unlike conventional glasses for valves. The vacuum leakage is prevented by the newly employed Kovar lead-wire that features almost the same thermal expansion coefficient with that of the Kovar glass. The 1 mm thick, hand‐made glass offers effective removal of harmful resonance.

Plate (anode)

Custom-ordered special metal processing mill rolls 3‐different metals in one layer, which is press‐finished with our exclusive mold, thus dramatically enhanced in strength thanks to its robust structure.

Spring Supporting Filament

Springs are all scrupulously inspected and chosen among bulk production lots specially produced from exclusive makes using strictly select tungsten wires.

Filament

Core metal cut out from thin, high‐purity Nickel plate offers outstanding heat‐resistance, whose shape is specially designed to insure smooth and equal heating without radiation.

Grid

Grid is made of high‐quality tungsten, selected by “dice” jig, and is strictly controlled within ±1µm accuracy at the diameter by means of the winding machine devised inside the factory.

Emission

Very material that emits the most important electron is firmly guaranteed in respect of both long life and high reliability.

Takatsuki TA-274B