Kits Kaneda

[Sébastien]

La fil va un peu du coq à l'âne même si nous restons tout à fait dans le sujet Kanéda. Comme je sais que le Kanéda No.224 attire souvent l'attention ici, voici les traductions des deux sommaires d'articles à son sujet (MJ no. 1080 et 1081). Quant à moi, je trouve la traduction du japonais à l'anglais assez bonne.

Bonne lecture,

Sébastien
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DC amplifier series No.224
All FET power IVC, SiC SBD rectified power supply integrated type
Equipped with D / A converter
SiC MOS-FET Power IVC [Part 1] Akihiko Kaneda

It is the appearance of the power IVC of AC power version. All FET configuration, built-in DAC, and small size. It will be the best amplifier to make the system simple.

Unlike the conventional configuration, the first stage constant current circuit of the power IVC has a form that fixes the gate of the Nch FET with a Zener diode. If it is a self-bias type of the conventional FET, there was a disadvantage that overcurrent flows at the time of cold start, but there is no fear in this form.
In the initial stage differential stage, cascade connection of 2SK 117 to 2SK 117 differential. The second stage is not a differential form but the current amplifier of 2SJ77. The final stage is Darlington (?) Composition of 2SK 214 and SCT 2080KE.
The biggest difference from amps already announced is that gain IVC has no gain adjustment. Will not this lead to stability of the NFB?

Supply voltage of voltage amplification stage is + 100V, -8V. Power supply voltage of power amplification stage is + 50V / - 50V.
For the transformer, it is TS-180 which was often used in UHC power amplifier. Many people are on hand and it seems to be useful for reuse. The winding for the heater is assigned to the analog part and the digital part of the DAC.
Diode for rectification is SiC Schottky diode of ROHM.

Although it is not specified about the maximum output of this power IVC, it seems that it seems to be a considerable high power amp. If this listening result is good, the way to the AC power amplifier is opened. This AC power amplifier is a nice plan for me who is lazy.

DC amplifier series No.224
All FET power IVC, SiC SBD rectified power supply integrated type
D / A converter installed
SiC MOS-FET power IVC [second part]

It is the production version of SiC power IVC with AC power version DAC built in.
The maximum output was 120 W at 8 Ohm load and 182 W at 4 Ohm load. According to the article, since 196 W is outputted from the amplifier of "Completely Symmetric Audio DC Amplifier" on page 187, if the drive stage is improved, the maximum output power can be expected to increase.
In the audition notation, it is stated as follows.

"The contrast between ff and pp is also surprisingly sharp and the music is lively and active From the standpoint of the audience, real serious sounds that you listen to from the performer's point of view are moving.
... ... ...
The fulfillment feeling of the super low sound common to SiC power IVC has been further increased. So much
Many kinds of instruments support super bass. This sound far exceeds the limit of the speaker. "

Although it is not explicitly written that the power supply voltage rises with AC power supply and the dynamic range has been expanded explicitly, I think that most of the improvement in sound quality of this amplifier is due to AC power supply.

Personally, as loading the DAC near the transformer for the power amplifier does not calm down, I think that it probably will not make it as it is in this production article, but it is probably possible to cut out only the power IVC and make it I thought.
It is nice information for AC power DC amp (?) Fans who intend to decide on lunches like me. With this, I can see the plan to convert the current UHC MOS power amplifier to SiC.
First of all, I'm thinking about replacing the diode of the UHC MOS power amplifier on hand.