Pursuing the Ultimate Sound Quality

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What's New?
Sansui in Early Days
Sansui Tube Era Prods
Who is Hashimoto?
Secret of Hashimoto Sound
Hashimoto Products
Technical Aspects
How Hashimoto Sounds
Tube Amp Projects
Finished Amps & Parts
Application Photos
MC Step-Ups
How to Order?
How do they look like?
Contact Information


Tube-Amps.net: Yesterday, Today, and Beyond....

Hashimoto Sound: The NEO-SANSUI Sound - The SANSUI Traditions Continue

It has been 10 years since this site introduced the Hashimoto transformers in the world.  Thousands of our customers all over the world have been enjoying the most vivid and transparent sound quality that  Hashimoto transformers can bring to their audio equipment.

Over the last 30 years,  various digital sources and related hardware have been brought into the market.  However, analog software still seems to be able to deliver the most musical and real-life like sound quality that can satisfy our desire to appreciate the music.  By the same token, well-built tube amplifiers can deliver the most natural and realistic sound quality than other counterparts can do.  Even if the music source needs to be digital, well-built tube amplifiers can naturalize and smooth out the harshness of the digital sound whereas other counterparts tent to enhance the shortcomings of the digital sound.  It certainly seems like well-built tube amplifiers are destined to be the most desirable amplifier for any kind of music source.       

In this reincarnation of tube amplifier technology for both analog and digital music sources, Hashimoto transformers are at the forefront of the continuous evolution of the transformer technologies since the 1950's when Sansui started the original transformer business.  Although this web site has not been updated for several years, we have brought various new products in the market that further improve and enrich your high-fidelity music experience. 

Here are some examples of our finest new  products introduced in the last several years (The HM-7, the H-EQL, the A-115, the A-305, and the H-20-600 are the products we initiated or requested the development at Hashimoto).  


HM-7 --  MC Step-Up transformer with certified OFC copper windings -- x15 / x30 (23dB / 29dB) gain           

H-EQL -- Coils for LCR equalizer

HI-6-10K -- High quality input transformer 600 Ohms : 10K Ohms

HI-6-47K -- High quality input transformer 600 Ohms : 47K Ohms

A-115 (per order basis) -- 5K 1:1 Internstage transformer optimized for Single-Ended Operation (can not be used for push-pull)

A-305 (per order basis) -- High DC current (up to 40mA DC) 5K 1:1 Internstage transformer optimized for Single-Ended Operation (can not be used for push-pull)

H-20-600 (per order basis) -- 20W class Single-Ended Output Transformer with 600 Ohms primary for Russian 6C33C tube


*** Please contact us for product availability and special pricing at support@obsinc.us   


Sansui Electric in Early Days

 Those who know Sansui with the famed later products, such as the BA-5000, the CA-3000, or the AU-20000, or receivers and tuners, such as the G-33000 or TU-919, might say "Sansui Tube Gear???"  However, the reality was that Sansui built its foundation with transformer business, and established its first international fame with the 1000A Tube Receiver.  Of course, the most signature tube product was the AU-111 at the very end of tube era followed by less known, but impressive tube amplifiers.  More details....    


Sansui Products in Tube Era

 Sansui's very first product lines were bare transformers; this means no Sansui amplifiers or no Sansui receivers at the beginning.  After the initial success with high quality transformers, Sansui started marketing kit amps and receivers followed by many well built tube amplifiers and receivers.  One thing in common among these early Sansui products was that Sansui never compromised in quality.  This philosophy in quality was Sansui's absolute priority until the late 1970's when Sansui started marketing some inexpensive models under the same brand name.  More details....


Who is Hashimoto Electric?

Hashimoto Electric Co., Ltd, started its business in 1958 as an OEM transformer manufacturer.  From its beginning, Sansui Electric was one of Hashimoto’s main customers.  Since Sansui spanned off its entire transformer business - including all blue prints, patents, distribution / sales force, and even Sansui's original logo - to Hashimoto in 1979, Hashimoto Electric has been maintaining Sansui's product philosophy and quality traditions.  Even today, Hashimoto sells Sansui transformers with Sansui's original logo on them.  In addition to these Sansui transformers, Hashimoto started manufacturing own tube transformers in 2002.  More details.... 


Hashimoto Products

Hashimoto supplied the famed AU-111 transformers to Sansui vacuum tube transformer, single ended output transformer, tube amp transformer when Sansui reissued the AU-111 Vintage in 1999. Now, Hashimoto offers own branded tube transformers in 34 different models.  These transformers have been designed from the ground up based upon the 60 years of accumulated know-how and technologies.  A few critics stated, "The sound via Hashimoto transformers simply belong to a different level compared with others."  More details and technical specifications.....                 


Tube Amp Projects Utilizing Hashimoto Transformers

These nine amplifiers utilizing Hashimoto transformers were originally featured on Japanese hi-fi magazines in 2003 and 2004.  These applications include Push-Pull and Single-Ended with KT-88, EL34, EL84, etc.  Some of applications use coupling transformers, as well.  More details.....   


What's  New

bulletNew Page - The Secret of the Hashimoto Sound
bulletMy Own Project - 12BH7A Cathode Follower Driven 300B Single-Ended Power Amplifier
bulletAdded two new sections: Technical Aspects and How Hashimoto Sounds?
bulletour new BBS

Key Issues

bulletWhy Sansui?  Sansui used to dominate the Japanese Tube hi-fi industry with tube transformers as well as receivers and amplifiers.
bulletWho is Hashimoto?  Hashimoto Electric became a Sansui's transformer OEM in 1979 by inheriting all Sansui transformer technologies.
bulletCan I buy new or used replacement transformers for Sansui AU-111, AU-70, or 1000A Receiver? YES
bulletCan I buy the newest Hashimoto transformers?  YES
bulletCan I find other high-end tube parts? YES 





vacuum tube transformer, single ended output transformer, tube amp transformer 














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For problems or questions regarding this web contact support@obsinc.us.
Last updated: 02/01/15.