Bakoon Products SCA-7500K Power Amplifier with Volume
Product code: 75k-1Bakoon Products SCA-7500K Power Amplifier with Volume
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Play high-resolution sound with plenty of room
An advanced version of AMP-KUMAMOTO
It is a product developed from AMP-KUMAMOTO. AMP-KUMAMOTO omits input buffers and the like in order to keep the price low. For this reason, the input impedance is as low as 1 kΩ. Modern CD players and music players have low output impedances, so there is no problem, but an input impedance of 1 kΩ can be too low to connect something with a vacuum tube output. Instead, the speed is faster because there is no buffer, and there is only 1/10,000,000th of a second of a delay. However, there was also a demand for a product with a high input impedance, so the SCA-7500K was developed as a higher-end version of AMP-KUMAMOTO.
SCA-7500K built at the origin of the Satori circuit
This unit is a bargain. It was supposed to reduce costs and make an amplifier at a lower price following the AMP-KUMAMOTO, but various ingenuities and considerations were added, such as recreating the circuit diagram five times, changing the PCB three times, and replacing it with an upgraded PCB again, even though it was commercialized after changing the PCB three times. High-performance J-FETs are used in the input stage, and a large amount of high-end capacitors called OS-CON are introduced. If you actually calculate the number of parts, it is close to the high-end SCA-7511 MK3. In addition, the SCA-7500K uses SATRI-IC-V9.3, which integrates 14 transistors, and the biggest feature is that it ensures a wider bandwidth, stability, and accuracy. By securing an input impedance of 100 kΩ, it is a very attractive model in terms of compatibility with tube amplifiers with high output impedance and improved speaker driving force.
In addition, in the AMP-KUMAMOTO, it took 5 or 6 minutes after the power switch was turned on until the bias was adjusted, but in the SCA-7500K, a bias turbo circuit is added and the rise time is about 10 seconds.
Since it is only an RCA input, I think it is an attractive model that allows you to enjoy the overwhelming reproduction sound of the SATRI circuit with your preamplifier without being trapped by the SATRI link.
Like other power amplifiers of the company, it comes with volume adjustment, so it is a big advantage that you can directly connect a music player such as a CD player and easily enjoy it as a pre-main without a preamplifier.
It also has a full-fledged headphone output, so it's good that you can enjoy music without hesitation even late at night.
| output | Speaker output 15W+15W(8Ω) / Headphone output (standard plug) x1 |
|---|---|
| input | Voltage input (RCA jack) 2 systems |
| Input impedance | 100kOhms |
| Gain Control | Volume (Standard) / Metal Film Attenuator (Optional) / Non-Inductive Winding Resistance (Optional) |
| size | 80mm(H) x 240mm(W) x 300mm(D) |
| weight | 3.0Kg |
*Bakun Products will gradually change its logo and name to SCL (SATRI Circuit Laboratory). Thank you for your understanding.
What about the attenuator?
The metal film resistor ATT has a very large amount of information, very good sound separation, and a rich mid to low frequency representation.
The non-inductive wirewound resistor ATT has minimal distortion, very high resolution, rich low frequencies, and a natural sound with no habits despite its dynamic sound.
In the first song, Anne = Sophie Mutter playing. It's a good track to grasp the microdynamics of the violin. After a violent intro, a quiet and detailed violin solo proceeds, but the static and subtle expressions that envelop the surroundings are expressed without a single adjustment. If you close your eyes and listen to it, the song itself is a tragedy, and the lyrical feeling drifts in the air. The quick response without any waste is very impressive.
This was followed by "You Look Good To Me" by the Oscar Peterson Trio. The long double-bass passage at the beginning of the game was surprising. A heavy and dense sound comes out. The fingertips move apart and the bass line falls just below it. Natural and dynamic. The result of the brush rubbing the snare looks bright, and the piano in the center appeals with the right amount and presence. The presence of the piano trio filled the stage. There is no gap.
Finally, Diana Krall's "Temptation". After all, I am amazed at the punching power of the low range. A base that springs up powerfully. What is such a wide range of alternatives? In terms of vocals, Kroll's characteristic crustiness and sensuality are brilliantly mixed in. Gorgeous and also beautiful. The other solos in the middle are as real as if they were right in front of you. When you close your eyes, it seems that a crawl is standing in front of you. Once this entry class is created, what should we do next?
