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大型真空管EL51(プレート損失45W)三結シングルアンプ用管球セット EL51, 5R4WGB, 12AT7 各2本
        

  • Product Quantity
    : 1
  • Starting Bid
    :24,900円
  • Highest Bidder
    : / Rating:
  • Listing Date
    :May 24, 2026 21:04
  • Bidding closes on
    :May 31, 2026 20:03
  • Auction Number
    :g1230707685
  • Condition
    :State it in the description
  • Automatic Extension
    :Yes
  • Authentication
    :No
  • Early Closing
    :Yes
  • Can I return the product?
    :no
  • Description
  • Q&A ()
  • Cost Estimator
  • Problem Item Response Procedur
Notes
  1. The product may not include an outer box. Please place a bid after confirmation.
  2. The product location is far from the overseas delivery address (Kanagawa), please pay attention to the Japanese shipping fee
EL51三結シングルアンプ用の真空管セット,ステレオ分です.
一般には知られていませんが,EL51は三結の最大プレート損失45W, 最大プレート電圧750Vの優れものです.
(最大g2電圧が750Vと高いので,EL156よりも使いやすいと思います.)
ソケットはAD1と同じサイドコンタクトですが,ヒーターは6.3V, 1.9Aで使いやすいです.
三結シングルで出力8Wは出ます.
EL51の規格表はネット上で見つけることが出来ます.

出品物はEL51(Philips製,白箱),5R4WGB(Cetron製,軍箱),12AT7(Sharp製,箱なし)各2本,合計6本のセットです.
EL51のロット番号はM83-K3KとM83-K4Eです(写真3).
M83-K4Eの電極は再ハンダしてあります.
各セットを使ってアンプの性能試験をしてあります(写真9と10)
測定条件は,写真9と10の上部に記載.
シングルアンプでは,前段,出力段の組み合わせによって歪の打ち消しが生じます.
このセットでは,12AT7を選別してあり,2セットの雑音歪率特性は極めて類似しています.

 2本のEL51の電気特性は以下の通りです.
シリアル番号M83 K3K (No.8)
Vbb=350V, Vk=13.56V (Rk=283.7Ωの自己バイアス)
Vbb=581V, Vk=26.08V (Rk=404,3Ωの自己バイアス),アンプ装着時の残留雑音1.0mV

シリアル番号M83 K4E (No.9)
Vbb=350V, Vk=13.61V (Rk=283.7Ωの自己バイアス)
Vbb=575V, Vk=25.80V (Rk=404,3Ωの自己バイアス),アンプ装着時の残留雑音1.1mV

 真空管は家電製品とは異なり,取り扱いに注意が必要です.
特にEL51は,プレート電圧の高いサイドコンタクトのトッププレート管です.
真空管アンプ初心者は入札をご遠慮ください.

 十分にテストはしてありますが,基本的には古いものです.ノークレーム,ノーリターンでお願いします.
丁寧に梱包して,80サイズで北海道からお送りします.

 なお,「商品の状態:未使用に近い」としてありますが,EL51,5R4WGBは動作・性能チェックのみ,12AT7は使用時間僅少です.
以上の点にご納得いただけない場合は,入札をご遠慮ください.

補足:
  過去の「無線と実験」誌に5極管接続の例がありますが,成功とは言えません.
この真空管は,むしろ3極管接続で本領を発揮すると思います.
 特性測定に用いたアンプの詳細については,下記をご覧ください.
https://auctions.yahoo.co.jp/jp/auction/d1201018148
(ご希望があれば,ご落札後,本アンプの回路図をお見せします,)


(2026年 5月 21日 18時 07分 追加)
以下のブログに詳しいです.
https://colorkonan16.asablo.jp/blog/cat/el51/
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1. International Shipping

   Air Freight: If the item status is not confirmed within two days after the arrival notice, any customer complaints cannot be addressed with the seller.

2. After Receiving the Product

Please confirm and inspect the product as soon as possible to ensure that the product specifications, quantity, accessories, and description are correct

If, unfortunately, there are any issues, you can refer to the following examples on how to report related product problems:
1. Example of missing product information
2. Example of product not matching provided information
3. Example of damaged product information

Important Notes: 1. If the seller is unwilling to ship overseas or is unaware that the product will be shipped overseas, the international shipping cost for returns or exchanges will need to be borne by the member. You may refer to the EMS e-Express fee inquiry from the post office. If it involves alcoholic beverages or items that affect flight safety, the post office cannot be used for shipment, and only DHL can be used to ship back to Japan.
2. During the product complaint handling period, please retain the complete outer packaging of the product (including the shipping label information), and refrain from attempting any repairs or altering the original condition. Any modifications may result in the inability to process the case.

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After receiving and inspecting the item, if you have any questions, it is recommended to contact Letao within 2 hours. Here are some reminders:

1. Please do not unpack, use or repair the received item yourself, and be sure to keep the original packaging to facilitate subsequent handling of related matters, so as to avoid changes to the item that may cause the seller to be unwilling to process.

2. You can call customer service, and the customer service will leave a message for you as below. Please provide the following information:
"Hello, we will first help you establish a complaint case for Product ID: _______ .But we need you to 2-3 clear photos of the product issue, including photos of the product problem, product packaging, shipping details slip, and outer box. Send them to service@letao-holdings.com and inform us of your desired resolution (failing to provide this may result in an inability to process subsequent matters). After sending the email, notify us in the customer service message. We will confirm with the seller as soon as possible. and if there are any related questions, we will contact you through the customer service message. Thank you for your cooperation."

Please provide:
1. "Product ID"
2. Photo of the "Delivery Note" (if any)
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4. Photos of the product (Please include relevant descriptions to help us confirm with the seller)

Important Notes:
1. Do not include foreign text or other products in the background of the image.
2. Please keep the complete product packaging (including the shipping label information), and refrain from repairing or altering the original condition on your own, as any changes may result in the case being unable to be processed.
3. Please provide the relevant information within 48 hours to avoid missing the golden hour for reflection and causing situations that cannot be handled.
4. Due to 99% of Japanese sellers being unwilling or unaware of shipping goods overseas, if a seller is willing to handle the issue, the goods must be sent back to Japan, and the international shipping costs incurred must be borne by the member. Letao will use postal EMS international express to send the goods back to Japan.
5. As the goods are purchased from overseas, it may take approximately one to two weeks to complete the relevant processing procedures when issues arise with the goods. Please be reminded that you can inquire about the approximate cost through the EMS service at the post office.

4. FAQ

1. Issue of Authenticity: If antique or branded goods are found to be counterfeit upon receipt, clear photos showing the differences between the genuine product and the imitation must be provided as evidence. If unable to provide relevant proof, assistance can be sought to find a third-party reputable organization for a premium authentication service .
2. Leaking Iron Teapot: If an antique iron teapot is leaking, please take clear photos of the leaking area and provide them.
3. Transport Damage: If the goods are damaged during international shipping (to the pickup point), you need to provide photos of the outer packaging of the parcel and clear photos of the damaged goods' outer packaging.

※ Note: Photos provided to sellers should not contain any foreign-related information.
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    Product name: 大型真空管EL51(プレート損失45W)三結シングルアンプ用管球セット EL51, 5R4WGB, 12AT7 各2本
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