Hi, I am Asai of Hi Fi Do Record Shop. It has become a little cooler in the rainy season, but it is still hot. I intentionally wear thick clothes and will report on my trial to exchange cacuum tubes in this hotness as if I were seeking the released coolness. |
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I used the famous Marantz 8BK model. My plan is to enjoy the difference of sound by exchanging the 6CG7s of this 8BK. |
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Here comes first the SYLVANIA's 6CG7s after I removed the original American GE tubes. My first impression is that the legs are short! Is this the know-how of the SiLVANIA? Almost all the makers employ the same length, but the length of the SILVANIA's legs are clearly shorter by more than a quarter. At first hearing the sound has becomes delicate. Though sounding of the low range seems to be weakened, the depth of sound has increased expressively. The price is reasonable and they might be the best tubes for you to buy. Feature: They have enough resolution and offer to you colorful sound. |
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Next comes the most sought-after tubes. They are the RCA's chear-top 6CG7s. They are valuable tubes that can be rarely seen by now. It is only one moment when I feel the sound is thin, but the next moment I am surprised at the lowered noise and the depth of sound. The low range sound does not come out in a moment, but it comes out slowly but steadily. Feature: We recommend them to those who seek the best quality. |
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Please do not think these are the same as the previous RCA clear-top 6CG7s. In fact these are made in Mexico. I started to listen by using these Mexican-made tubes, out of curiosity to know how the sound will change, and I am surprised. The sound is deep, thick and acoustic, but not sentimental in expression of details. It expresses quietly the quiet part of the song. Furthermore, the sound never becomes thin. Is this a Mexican characteristic? Feature: We recommend them to those who seek quality and excitement in sound! |
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Back to the American-made tubes. The sound is lacking in something, but I can listen to it feeling at ease. It is a familiar sound. I have an impression that the sound is focusing on the center. Then, I exchange the tubes with the same matched tubes in stock. (shown in the photo) The sound has become somewhat more delicate. Dividing is also good. This is the taste that only American-made tubes can create. Feature: We recommend them to those who would like to make your amp colorful with tubes. The sound will become easier and more familiar to hear. |
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How does it feel to read this week's report on my trial to exchange vacuum tubes? So far as we sell vacuum tubes, we are going to exchange them from now on too. Please look forward to my next report. |