New Release - ”Vocal On Stave” pitch & scale check / Free of charge!


Vocal pitch & scale check app, "Vocal On Stave" was newly released today!

Support tool for improving your singing voice!

"Vocal On Stave" gives you valuable visual feedback on your vocal pitch.
You just sing into the built-in microphone on your iPhone, and it graphs the estimated vocal pitch on the stave.

Please use this app to improve the ability for your singing.

- Vocal analysis and pitch estimation for human voice.
- Display ranges: 4 octave (up to C6 from A2)
- Sensitivity level: 0 (Low) - 10 (High)
- Pitch analysis display can be scrolled back in the time axis.
- Automatic stop up to 60 seconds

vos_1_v100.png vos_2_v100.png

Please to click the following link to show this app on App StoreTM. It will be open our product page on App StoreTM.

posted by toons at 13:26 | News


Information on season's holidays closure

We will be closed from 2019/12/28 to 2020/1/5 for the season's holiday.

Regarding inquiries received during the holidays, we will respond sequentially after the holidays. Thank you for your understanding.

Have a good new year !


posted by toons at 22:57 | News


Marché de Noël 2019


Yesterday, I went to "Marché de Noël 2019".


Le Marche is held once a month at "Institut français du Japon – Kansai Kyoto". Since this month is Christmas, it is held for two days on this weekend. I look forward to this event every year.


Noel's decoration was displayed and there was a wonderful live performance of Argentine guitar by Guillermo Rizzotto.

Noel's decoration was displayed and there was a wonderful live performance of Argentine guitar by Guillermo Rizzotto.

Illuminations are handled by the art group “Mirror Bowlers”. The space of light projection using mirror balls was very fantastic.


Kyoto city was a cold day with light rain, but there were many stalls and many people gathered.


I was warmed by drinking French orange wine and mulled wine.

posted by toons at 07:43 | diary


ROHM Illumination 2019


I went to "ROHM Illumination 2019".


A semiconductor manufacturer, ROHM, holds an illumination event using its own LED around the Kyoto headquarters at the end of the year.

I went a little early because it was very crowded around Christmas.



It was still cold, so I was able to appreciate the beautiful illumination.

posted by toons at 23:57 | diary


Nakamichi SR40 STASIS Stereo Reciever


Nakamichi SR-40 STASIS Stereo Receiver

An amplifier with a tuner released in 1987. My audiophile friend asked me to this amp if I could repair it.

“SR-40” has a STASIS power amplifier circuit. STASIS is a non-feedback type amplifier developed by Dr. Nelson Pass at Threshold.

Nakamichi received a patent license in 1985, and in the following year it was first commercialized in the power amplifier "PA-70 / 50" series. At that time, Threshold released only super-high-end products and licensed Nakamichi to develop products in the middle range and below.

There was no pre-main amp product at Nakamichi at that time, and the stereo receiver product with STASIS was the SR-40 (SR-4 in overseas), and it was a high-end model with a sales price of 148,000 yen. There seems to be a product called “SR-30 / 20” in the lower model.

Until this "SR-40" was manufactured in Japan, but the models after that seem to have been manufactured overseas, and the product quality seems to have deteriorated considerably. The successor model was renamed “TA-40 / 30 / 20” and was released until around 1990.


At that time, stereo receivers were very popular in North America, and the market size was also large. In the catalog of “SR-40”, “The Audiophile Receiver” and “Remote Control STASIS Receiver” are displayed and it seems that it was appealing as a stereo receiver for audiophiles.


The appearance of the “SR-40” is so good that it cannot be seen by an audio product 32 years ago. The owner said that sound was coming out, but sometimes it was also mixed with noise.
However, I was drowned to turn on the power suddenly, so I opened the case and checked it.


The lower board is the main amplifier board, and a fairly large heat sink is placed in the center.
Dust was piled up on the board, but no electronic parts were burned or burned out.
The old famous device Sanken 2SA1491 / 2SC3855 was placed in a 2 parallel configuration in the final stage.


Since it is almost composed of discrete parts, the repair is a little easier.
However, this is the first time I have seen an amplifier with so many styrene capacitors. Styrene capacitors are famous parts because of their good sound, but they are very sensitive to heat (heat-resistant temperature is about 85°C), so if a damaged part is found, it will be very difficult. Since it is already discontinued as a part, whether there is dead stock somewhere ...


Since there is also an AM / FM tuner board on the front panel side, it is a fairly complex and high-density mounting. To improve the sound quality, it may remove the tuner circuit.


The power supply has a large toroidal transformer, and the two large electrolytic capacitors were still safe.

I tried to leave it for a while after turning it on, but it did not generate any heat, abnormal vibration, or smoke. Because of the large heat sink, the temperature rise of the transistor is also mild.

When I was fine and put the music signal in the CD input and turned up the volume, the sound came out from the speaker properly. The main volume can be controlled smoothly without any rust, but the volume knob is quite heavy because of the motor control.

I also found that the display brightness of the AM / FM tuner was low, making it very difficult to see. When the FM antenna was connected, the signal meter was also displayed and the FM received sound could be played properly. I was surprised that the reception sensitivity was better than my FM tuner.

After a while, there was a symptom that sometimes the left channel was not output, but I found that the tone control volume seems to be poorly touched.

It seems to be mainly due to poor contact of the signal path, so it seems to be okay to not complete overhaul. For the time being, I'm trying to clean the contacts in questionable parts.

I've never heard of a STASIS amp, but it sounds like a high-end amp rather than a stereo receiver.
It's not particularly powerful, but it's a bit of a beautiful sound!

The reason why it was not popular in Japan was probably due to the product form of the receiver.

According to reviews from overseas users on the Web, the “SR-40 (SR-4)” has the impression that it sounds better than the “PA-50 (PA-5)” power amplifier with a STASIS circuit.

Around 1990, Nakamichi broke down in terms of contract with Threshold, and was unable to sell amplifier products with STASIS circuits.


This “SR-40” is a complex implementation, so it would be troublesome to completely disassemble and clean it. I got a service manual, so I would like to repair it in the meantime.。

Note (2019/12/11):
In the running test, sometimes the left channel was not output! Not only due to poor contact in the tone control section. I seem to have to overhaul it.
posted by toons at 23:58 | Audio