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Yahoo Bid Home Appliances, Audio & Video, Camera Audio Equipment Amplifiers Tube Amplifiers Main Units
差動プリアンプ Differential Preamplifier(真空管プリアンプ)/ハンドメイド製作品 No,5 6DJ8/ECC88 
 
        

F特性 DATA参考例

THD+N DATA参考例

  • Product Quantity
    : 1
  • Starting Bid
    :39,000円
  • Highest Bidder
    : オーディオわんこ / Rating:31
  • Listing Date
    :2026年01月19日 05時57分
  • Bidding closes on
    :2026年01月19日 09時10分
  • Auction Number
    :l1211201785
  • Condition
    :New product
  • Automatic Extension
    :Yes
  • Authentication
    :Yes(Description)
  • 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 remittance needs to be completed within the time required by the seller
商品説明

Differential Preamplifier(差動式真空管プリアンプ)/ハンドメイド製作品
本機は、手配線による丁寧な組み上げを行い、使用部品は一点ずつ選別を実施しています。
希少なパーツを採用しているため、限定製作となります。
癖のない自然な音質でありながら、艶やかで立体的な表現力を備えています。
真空管ならではの質感を活かしつつ、どなたにも扱いやすい設計です。
コンパクトながら、メインシステムでも十分にご使用いただける高品位なプリアンプです。

内容・仕様

本機は、真空管差動増幅回路を採用したフラットタイプのラインプリアンプです。
音響特性に優れた 双三極管 6DJ8/ECC88 を各チャンネルに1本ずつ(合計2本)使用。
現代的な設計思想をもとに、現代的な安定性と高S/N比を実現しています。


主な仕様
  • 動作回路:差動増幅回路(双三極管 6DJ8×2 テスト品 使用品 松下)
  • 動作ゲイン:約2.0倍(約6dB
  • 入出力RCA入力 1系統/出力 1系統
  • 出力インピーダンス:低出力仕様(直熱管パワーアンプにも最適)
  • 推奨負荷インピーダンス35kΩ以上
  • ボリュームALPS RK27シリーズ 50kΩ 高品質ポテンショメータ
  • 基板100台以上製作したノウハウの詰まったオリジナル基板
  • 電源: Rコアトランスのローリンケージタイプ
  • 電源ケーブルIEC 3Pタイプ電源ケーブル付属
  • サイズW300 × H55× D230 mm

特性等
  • 周波数特性20Hz20kHz+0 / −0.5dB以内) 32Hz-50KHz +0 -1.5dB
  • THD+N 1KHz 1.0V 0.20%以内
  • クロストーク 70dB以上 (20Hz-10KHz)
  • S/N 90dB以上 1.0V時 Aフィルター 1KHz 
  • チャンネルセパレーション 90dB以上 (1KHz)
  • チャンネル間ゲイン誤差 VR MAX時 0.2dB以内
  • 残留ノイズレベルは0.02mV (Aフィルタ)
付属資料:
  • 基本回路図(1CH分)
  • 周波数特性グラフ
  • THD+N特性グラフ(歪率データ)

付属品
  • IEC電源ケーブル(3P-3Pタイプ)
  • 測定データ

注意事項
  • ご落札後 24時間以内のご連絡・お支払い をお願いいたします。
  • 基本的に相互評価を希望しております。
  • 保証付き商品のため、代理入札・代理落札はお断りいたします。
  • 新規IDの方、または過去6か月以内に取引評価のない方の入札はご遠慮ください。
  • 取引ナビを必ずご確認ください。
  • 内容はスマホではなくパソコンで確認して下さい。
  • ハンドメイド製品のため、外観や仕上がりに若干の個体差がありますが、音質への影響はございません。
  • 特注仕様等の対応は出来ません。
  • 本機出荷時状態から改造を行なったものの修理は受けません。
  • 修理時の送料は往復分ご負担ください。
  • 部品入手性から限定品です。

過去の製作品では 累計100台以上の実績があり、多くの方にご愛用いただきました。
今回は 約3年ぶりの久々の製作となり、設計・音質ともにさらにブラッシュアップした最新版です。

この機会をぜひお見逃しなく。

We are pleased to accept bids from overseas buyers.
International bidders are welcome to participate in this auction.
The product has been closed, and you cannot ask questions.
Question list
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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: 差動プリアンプ Differential Preamplifier(真空管プリアンプ)/ハンドメイド製作品 No,5 6DJ8/ECC88 
    Notes:
    Customer service hours:
    • Monday to Friday 10:00-18:00
    Customer service hotline:
    Customer Service Email: service@letao.my