I made up a test setup using ES9038q2m boards equipped with I2S input from Amazon to test DCX2496 LVDS modification. This board is cheap, not requiring MCLK, and level control is included, so it is ideal for test purpose. I found that the …

Audio enthusiasts enjoys exotic expensive cables. I agree that hear the difference is a great fun. But that is too expensive for just a digital cable! To reduce the cable issue and exotic expenditure, I have chosen cheap Ethernet cable. An…

There are several projects to modify DCX2496. Some are improving analog circuit or power supply quality, while others add 3 band (Low/Mid/High) digital (SPDIF) outputs. DCX2496 has a digital input as standard, so what I need is just to add…

I start working on Behringer DCX2496 project and I decide to post my experience for future. I have a very old pair of Martin Logan Ascent speakers. They are old but still makes great sound except that electro-static unit above 280Hz loosin…

I recently a vacuum-tube power amplifier from Yahoo! Auctions in Japan. The spec is obviously high-end one, Yaquin MS-88B, KT88 pp 70W/ch. It was definitely cheap, but it came with one cracked tube out of 10. I wrote to them that I had pro…

I recently got Bose 403. They still has mounting kit for it, while there were absolutely no information on 403 itself.I am sitting on 403 now, I realize it is not a chair. What is it thought?

Another pair of Quad was on an auction site, now sitting in the middle of old ones. That is listed as ESL-63Pro Junk, because one of them makes bussing sound, which makes bussing sound as explained. One ESL-63Pro is now located at the midd…

I might be one of the most stupid audiophiles in this planet. I have used a pair of elegant Quad ESL-57, designed more than a half of a century ago in United Kingdom for domestic use, supposed to distribute sound from the air... Its sound …

eBay and other auction sites have a lot of Junk and broken power amplifiers. It is relatively hard to fix it to the original condition, because most of these broken amplifiers are fairly old, and some critical parts are obsolete and unavai…

I have heard that Kaneda-Shiki DC Amplifier (Kaneda-Style DC Amplifier) is well known in some areas, including France. Despite the information or articles in non-Japanese language are very limited, there are enthusiasts. I believe that the…

DAC modification I have implemented Asynchronous Sample Rate Converter (ASRC) clocked by a Xtal oscillator to my D/A Converter designed by h_fujiwara. There is an accessory connector (in place of dumping registers) between Digital Audio In…

I wrote to h_fujiwara to make sure what the advantage of the memory buffer right after PLL locked ASRC. Although, the effect of the memory buffer is obvious, and the clarity is much better than without it, I thought that is the placebo eff…

DIY Digital to Analog converter, DAC1794-III, which is designed by h_fujiwara is just great. As it burns in, the sound comes to be more natural, but, the only thing is it is just being too smart and performs exactly what it should do, but …

I made a DA converter that is produced by h_fujiwara. It consists of 2 8x8 inch boards, one of which is the power supply and the other is the digital, DAC & analog circuit. It is one of h_fujiwara’s high-end DAC with four of TI’s PCM1794 D…

I bought a genuine amplifier for my loudspeakers, QUAD. The loudspeakers are QUAD ESL57, electrostatic loudspeakers designed 50 years ago, and the amplifier is fairly old QUAD 606, which is relatively new, but born to drive electrostatic l…

There is a big improvement archived by the balanced digital cable with controlled impedance. I did not expect that significant difference, by modifying digital connection, but what happened was drastic, i.e. the accuracy of just 0s and 1s …

I made a simple SPDIF cable using Category-5 cable, and I feel great improvement over an optical fiber or a coax SPDIF cable. It is a modification of Zuka’s cable driver. The input jack, which plugs into the digital-output device like CD p…

I have made another power supply for the balanced-output preamplifier. There are 2 major improvements: (1) Electrolytic capacitors replaced with ceramic ones (2) Connection of the audio transformers as chokes modified. Some enthusiasts in …

I made a pair of line cable between balanced pre-out to balanced power-input. The cable consists of 3 braid cables because the balanced line requires 3 lines. It is unusual because, Unshielded line cable Line cable made of split low-end Mo…

The circuit is really simple (see figure). These tubes are two of 7370 (40V version of 5687WA). Heater is connected to AC input along with 270R (for 117V AC), or 150R (for 100V AC). It is strongly recommended that average output current do…

I made a vacuum tube power supply for semiconductor (aka Kaneda #168) preamplifier. I have surplus dual triode (7370). It seems it is tough enough to use for a small output rectifier with Grid and Plate connected together. Thus dual triode…

I am working on Pass's Zen 9. My plan is to simplify the circuit by lowering the output power, and using high performance heatsink, from Pentium4.VCC is reduced to 20V with extra idle current (2.5A), without active load. Output capacitor i…

I will write about more details on opamp based on Kaneda’s #168 preamp, and its modification.The original amplifier consists of discrete OPAmp (described later), -20dB attenuator (2 registers) at input, and feedback circuit (50KR volume (A…

I found that the page access increases, since I write in English. I simply wish your footprint, comments in ether English or Japanese so that I would stik on English information of Japanese experts.I really appreciate the audiecne's contri…

Recent Kaneda style amplifier is based on 2 stage differential, followed by collector (or drain) follower SEPP. Because it uses same polarity output devices instead of complementary polarity output device in SEPP output stage, it is called…

I found that there are not so many web pages on Kaneda-Style amplifiers in English. It seems Kaneda’s is more popular in France, and much popular in Japanese DIY community. Many enthusiasts are trying to improve the sound quality, by repla…

英語も混ぜて書いてみたら、気のせいかページビューが増えているみたいです。 日本語よりも英単語のほうが検索しやすいんですかね。The page started in Japanese, I recently added English, because I and my partner relocated from Japan to USA. I foun…

PassさんのZV9、少し経済的に作ろうと考えています。電源やヒートシンクはパソコンのジャンクを流用するとして、回路を単純化しようと思います。Aleph式のアクティブロードは少しややこしいし、せっかくのJ-FETだから普通のSRPP回路にできるんじゃないかなあ…

Passさんのアクティブロード、なんか不順な気がします。せっかくJ_FETがあるんだから、単純にSRPPにすれば良いような気がするんだけどなあ。。Mr. Pass's ZV9 seems perfect except that the active load is too complex. It is true that it improves the p…

日本に住んでいたころに買った部品を細々と使い続けてきましたが、新しい入手ルートを探して調達できるようになりつつあります。 最近ゲットした風変わりな部品、なんとV-FET(SIT)の現行品をみつけました。 桑港の南、シリコンバレーにあるQSpeed(元Lovoltec…