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KT88パワーアンプ モノラル ペア
        

後ろのアンプは出品物ではありません。

  • Product Quantity
    : 1
  • Starting Bid
    :10,000円
  • Highest Bidder
    : kabuto1978 / Rating:394
  • Listing Date
    :2026年02月11日 08時46分
  • Bidding closes on
    :2026年02月18日 20時43分
  • Auction Number
    :p1219219068
  • Condition
    :State it in the description
  • Automatic Extension
    :No
  • Authentication
    :No
  • Early Closing
    :Yes
  • Can I return the product?
    :no
  • Description
  • Q&A ()
  • Cost Estimator
  • Problem Item Response Procedur
Notes
  1. Plug-in electrical appliances are only shipped by air (shipping by sea requires commodity inspection)
  2. The product location is far from the overseas delivery address (Kanagawa), please pay attention to the Japanese shipping fee
みてのとおりダイナコmarkⅢに使われたトランスをそのまま使用しています。アルミ板を折り曲げ加工してシャーシから作りました。なかなか納得の行くアンプができたと思います。 ダイナコの出力トランスが好きで、もう5台程度アンプに使用しました。エネルギッシュで安定してきれいな音がします。 


 今回製作したアンプはmarkⅢとは違う回路にしました。以下の相違点を参照ください。 

1.前段を5極/3極複合管1本で構成したアルテック型から、安定したリーク・ムラード型に変更 

2.出力管のバイアス回路を固定バイスから、出力管1本ごとのセルフバイアスに変更。これによりメンテナンスが容易になりました。シャーシ背面のバイアス監視端子で容易にバイアス電流が確認可能です。 

3.プリント基板からラグ端子リード配線に変更。薄い銅箔から断面積の大きいリード線に変えたことで、信号の流れ、音に余裕ができた。

4.電解コンデンサを出力管から離して、熱衝撃を緩和させた。


 【仕様】
 ・定格出力:40W(3%歪、1KHz )
 ・歪率:20Wまで歪率0.35%以下(100Hz、1KHz、10KHz共通で)
 ・残留ノイズ:左右ともに0.5mV
 ・使用パーツ:電源トランス(ダイナコP782 /100V 仕様)、出力トランス(ダイナコA431)、チョークコイル(ダイナコ200mA)、真空管(JJ社KT88、松下5AR4、東芝6CG7、テスラEF86) 
 ・回路図は117V仕様になっていますが、実際には100Vで使用できます。
 ・外形:300×200×200(高さ) 
 ・重量:12KG (1台) 
 ・附属品:ACコード、取り扱い説明書


 トランス以外の部分は殆ど新品です。パーツも米国製のものなど、適宜選定して使用しています。出力管は新品のKT88(JJ製)を挿しています。 レタリング表示は6550Aですが、KT88でもどちらでも差し替え可能です。お手持ちの出力管を挿してお楽しみください。

 広帯域にわたり安定した余裕のある音がします。例として通常は「バスドラの音は迫力がある」と表現されることがありますが、このアンプは「バスドラが大太鼓のようになり、皮の表面の振動まで詳細に聴こえる」といった印象になります。 
 ジャズのスモールコンボでもビッグバンドでも、クラシックのフルオーケストラでも余裕をもって再生します。もちろんヴォーカルもOKです。

 半導体のハイエンドアンプを使用されていて、納得の行く音がなかなか得られていないかた、真空管アンプの音に興味があり、そろそろ常用機を本格管球アンプに変えたい、などのご希望があるかたは、ご検討をされてはいかがでしょうか。 

 

片方のアンプは、ダイナコのトランスに見受けられるように、わずかに唸りますが気にならない程度です。 

素人作業になりますので、塗装のムラ、剥がれ等があります。 

  このアンプは必要な場合は以降も当方で継続してメンテナンス対応をいたします。 

 発送は土曜、日曜日になります。ご了承をお願いいたします。


(2026年 2月 15日 19時 32分 追加)
過去に面白いことがありました。アバロン・アイドロンをジェフローランドのアンプで鳴らしていた方が、私から6550APPパワーアンプを落札されました。
真空管の挿し方も知らない方でしたが、繋ぎ変えて低音が余裕を持って再生されるようになり、同時に使用していた低音増強用の付加装置も不要になったとのことでした。
 自分は今まで何をやってたんだろう、時間がもったいなかったと仰ってました。その時のアンプもダイナコの出力トランスを使用したものでした。
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Product Price JPY
Japanese Consumption Tax(10%) JPY

A 10% consumption tax is applied to goods and services in Japan. The price may include the tax or it may be added separately. Please check the price details when ordering.

Note: This is a domestic sales tax applied within Japan.

Japan Local Shipping Fee JPY Japan Local Shipping Fee Reference
Product Weight KG The maximum weight limit is 30 kg
International Shipping Methods
Proxy bidding and purchasing services are becoming increasingly convenient. However, overseas shopping carries certain risks and issues. To reduce these risks and enhance shopping safety, please be sure to read the following information:

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.

3. After Inspecting the Product

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.my 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)
3. Photos of the outer box (including inner and outer packaging)
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: KT88パワーアンプ モノラル ペア
    Notes:
    Customer service hours:
    • Monday to Friday 10:00-18:00
    Customer service hotline:
    Customer Service Email: service@letao.my