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  1. tuynhdx

    tuynhdx Advanced Member

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    Tên mặt hàng:Bán đèn 6211 tương đương 12AU7
    Tình trạng, mô tả:Bán đèn 6211 tương đương 12AU7, bóng đẹp như mới, em có hai đôi.
    Giá bán:8tr một đôi
    Khu vực:Hải Phòng, ship toàn quốc
    Điện thoại:0919144357
    Giao hàng:CPN
    Ảnh chụp thực tế
    9B197555-4DD3-4099-BE4C-BA15C018D8EB.jpeg 5A31C9AD-B348-447F-AC53-FDA8DA098501.jpeg 0200CCED-BA27-47FB-96EA-B7A7BA6EFE48.jpeg
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  2. anchoi

    anchoi Advanced Member

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    Bóng này gần với 12AT7 chứ không phải 12AU7 bác ạ.
     
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  3. tuynhdx

    tuynhdx Advanced Member

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    Nhất trí bác, T thì lại gần U hơn X. Vậy nên ….
     
  4. Arphiphi

    Arphiphi Advanced Member

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    Nên làm sao bác ơi …..
     
  5. Duong Vinh Phu

    Duong Vinh Phu Advanced Member

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    6211 tương đương 12au7
    6201 tương đương 12at7
     
  6. Duong Vinh Phu

    Duong Vinh Phu Advanced Member

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    Screenshot_20211117-151724_Gallery.jpg cắm vào khó mà rút ra đc kaka
     
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  7. anchoi

    anchoi Advanced Member

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    • 6201: Frequently, this number appeared along with 12AT7WA (military version) on the same tube. However, some brands made the 6201 as an “industrial” 12AT7. Sylvania made a 6201 in their Gold Brand line, and it came in the distinctive gold box, had gold lettering on the glass, and most (but not all!) had gold plated pins. Amperex made a very nice PQ version of the 6201 with gold pins. A few 6201 tubes, usually early ones, have an extra mica spacer on top, known as “triple mica”, and are noted for lower microphonics. Overall, this tube is a step up from the standard 12AT7, and most were made to meet military specs so that both military and industrial versions could be manufactured on the same assembly line.
    • 6211: This unusual tube is listed as a frequency halfer, in addition to being a class-A amplifier dual triode with medium mu. Medium mu means it has lower gain than the typical 12AT7, in fact lower than even the 5965 listed below. It also has much larger, flat plates that have diamond shaped points at the corners bent inwards (in the versions I have seen) that seem to add rigidity to the plate structure. This tube also has slightly lower plate voltage and current ratings
     
  8. Nguyentu2904

    Nguyentu2904 Approved Member

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    Bác cop nguyên đoạn quote dài ngoằng ra xong bác thử đọc lại xem có chữ nào nó nói 6211 gần hay tương đương 12AT7 không?
     
  9. Nguyentu2904

    Nguyentu2904 Approved Member

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    bác ơi thế bóng nào tương đương 12AX7 ạh?
     
  10. anchoi

    anchoi Advanced Member

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  11. gialong76

    gialong76 Advanced Member

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    Mình hiểu, 6211 và 12AU7 không hoàn toàn giống nhau, nhưng bác chủ đăng Telefuken 6211 thay thế 12AU7 cũng không sai.
    Mình đã dùng 6211 này thay cho 12AU7 một thời gian. Cũng đọc một số trang và hỏi một số bác thâm niên, thực tế mình hay thấy họ so sánh 6211 này với ECC802S do tương đồng cấu tạo.
    Bài này mình thấy họ viết gần giống câu trả lời của shop mình đã mua, gửi các bác tham khảo.
    "TELEFUNKEN 6211 W. Germany (<>) w/diamond bottom
    A rugged medium-mu (27) tube with operational specs somewhere between 12AT7 and 12AU7. Despite its slightly lower plate voltage and current ratings, this tube can safely replace the 12AU7/ECC82 and 12AT7/ECC81 in many applications.
    The Telefunken 6211 has identical construction and sound to the legendary Telefunken ECC802S/12AU7WA with a little more gain when used as 12AU7. Our stock is brand new and consisting of 3 production runs with the same U-digit serial numbers. The U-digit series are known as the best made and rare out of all the Telefunken 6211 tubes."
    Nguồn: http://www.nostubestore.com/2013/09/telefunken-6211-wgermany.html?m=1

    Xin lỗi bác chủ nếu bài mình lạc đề :)
     
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  12. Ngo Minh Vuong

    Ngo Minh Vuong New Member

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    Nếu nói gain 12au7 khoảng 27 thì 12at7 khoảng 65. Mà 6211 gain khoảng 52 vậy nên nó gần 12at7 hơn. Ngoài ra các đặc trưng khác cũng gần 12at7 hơn các bác nhé. Nó cùng họ với 5965, e180cc, e80cc. Còn cắm vào thay thế nhau các bác cứ thử cắm lẫn U, X, T ăn tất
     
  13. Duong Vinh Phu

    Duong Vinh Phu Advanced Member

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    Screenshot_20211119-110240_Chrome.jpg Screenshot_20211119-113529_Chrome.jpg ...........................
     
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  14. tuynhdx

    tuynhdx Advanced Member

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    Chuyên môn cao quá cháu ko hiểu gì luôn. Chỉ biết thay thế vào 12AU7 thì nó hay hơn thôi ạ :)
    Cháu đã bán một đôi, chủ mới cũng cắm thay 12AU7 thì khen chứ ko nói gì khác. Cám ơn các bác
     
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