Bakoon Products SCA-7500K Power Amplifier with Volume

The origin of the SATRI circuit. High input impedance of 100 kΩ and ultra-fast start-up of 10 seconds

The SCA-7500K is a power amplifier with volume developed as a higher version of the popular limited edition model AMP-KUMAMOTO. The circuit returned to the origin of the SATRI circuit and introduced carefully selected components such as SATRI-IC-V9.3. The ultra-fast (1/10 million latency) sound of SATRI circuits can be enjoyed in a wider variety of systems

High compatibility and convenience

• High Input Impedance: The AMP-KUMAMOTO's low input impedance (1kΩ) has been improved to ensure 100kΩ. This improves compatibility with a variety of instruments, including tube preamps with high output impedance.
• Vias Turbo Circuit: Significantly reduced start-up time during start-up. Bias adjustment, which used to take 5 to 6 minutes in the old model, is completed in about 10 seconds.
• Available as a pre-main: It is equipped with a volume adjustment function (gain control), so you can directly connect a CD player or other music player. You can easily enjoy music with this one as a premain amplifier without a preamp.
• Headphone output: It is equipped with a full-fledged headphone output, providing the convenience of enjoying music even late at night.
• RCA input only: With only two RCA inputs, you can enjoy the overwhelming sound of your SATRI circuits with your preamps and equipment without being stuck in a SATRI link.

SATRI-IC-V9.3 and selected partsHigh-FidelityChemical

• Core Technology: SATRI-IC-V9.3 was adopted, which integrates 14 transistors. It ensures wider bandwidth, stability, and accuracy.
• High Performance Components: A high-performance J-FET was introduced to the input stage, and a large amount of OS-CON, a high-end capacitor, was added. The number of parts is close to that of the advanced SCA-7511MK3.
• Sound quality trends: It is a very attractive model in terms of the overwhelming reproduction sound unique to the SATRI circuit and the improved driving power of the speakers.

In addition to the standard volume, you can choose an optional attenuator for sound quality.

The first thing I noticed when using the SCA-7500K was how fast the sound started.
Since it is a power amplifier with volume, I tried connecting it directly from the DAC, and the sound comes out surprisingly honestly. Perhaps because it does not go through unnecessary circuits, the sound is fresh and there is a feeling that the rise is quickly forward.
The midrange is very clear, and the vocals and strings are neatly positioned in their natural positions.
The contours are sharp, but not hard, and there is little bleeding. I'm not the type to exaggerate the sound boldly, but I can clearly see the differences in the recording and the nuances of the performance. It gives the impression that the music is organized and can be heard.
The low frequencies don't feel like they're pushing with volume, but the braking is effective and the rhythm is clear.
The bass line and drum attacks are clear, and the tempo is not broken. I felt that small to medium-sized speakers could sound comfortably without difficulty.
The fact that it has a built-in volume control is also practical, making it a major advantage that you can set up a simple configuration without using a preamp.
Even when connected directly to a DAC, the sound does not become thin or rough; rather, the response of the sound improves, and the sense of speed increases. It is well-suited for those who want to enjoy music in a minimal setup.
It is not an amplifier for those seeking flashy features or high output, but
for people who prioritize sound freshness, speed, and clarity, I think it is a very well-crafted amplifier.
It’s a model that leaves only what is necessary, typical of Bakoon’s design.