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Yahoo Bid Home Appliances, Audio & Video, Camera Audio Equipment Amplifiers Headphones Amplifier
TEAC UD-301 シルバー【高音質化+オペアンプ換装済み】【OPA627 + OPA1612】USB DAC ヘッドホンアンプ
        

  • Product Quantity
    : 1
  • Starting Bid
    :19,800円
  • Highest Bidder
    : kimijun / Rating:143
  • Listing Date
    :2026年02月26日 05時09分
  • Bidding closes on
    :2026年02月27日 21時09分
  • Auction Number
    :u1220441281
  • 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. Plug-in electrical appliances are only shipped by air (shipping by sea requires commodity inspection)
TEAC UD-301(シルバー) 高音質化の改造を施したものを出品いたします。

外観や動作は良好で、各入出力とも問題なく機能しています。
大切に使用してきた個体ですが、資金捻出のために出品することといたしました。

写真にはありませんが、付属品として、電源ケーブルをお付けします。

=========
(改造内容)
PCM1795以降のアナログ信号経路
I/V変換 → LPF → 電子ボリューム後バッファ → 出力段手前に至るまで、
音質に直結する主要部品を上位グレード品へ交換しています。

回路図を確認のうえ各段の動作原理や補償定数を把握した上で改造実施しました。
本機は回路そのものを変更するものではなく、オリジナル設計を尊重したまま、
アナログ段のアクティブ素子および電源系部品を性能上位品へ置き換えた仕様です。

■ I/V変換段
MUSES8920 → OPA627AU(デュアル化基板使用)(金メッキソケット実装)
DAC直後の電流‐電圧変換部を高性能JFET入力オペアンプへ交換。
高スルーレート(55V/μs)による信号追従性向上を図りました。
I/V段はDACの性能を引き出す最重要部であり、歪率および高域特性の面で理論上有利となり、
結果的に音質向上を狙っています。

■ LPF/バッファ段
NE5532 → OPA1612(DAC後・NJW1195後ともに)
低ノイズ密度(約1.1nV/√Hz)、低THD+N特性、高GBW(40MHz)
ローパスおよび出力バッファ段のノイズフロア低減と歪率改善を図ったものです。

■ 電源部コンデンサ
日ケミ KMG → 東信 UTWRZ(低ESR)
電源インピーダンス低減による瞬時電流供給能力の改善を目的としています。

■ 信号経路カップリング
Suncon AX → PMLCAP(フィルム系)
XLR出力カップリング → MUSE KZ
どちらも音質に定評のあるコンデンサです。
性能面でも、誘電体吸収やESR特性の面で有利です。

■ ヘッドホンアンプ基板
カップリングをMUSE KZに交換したほか、金メッキソケットに換装しています。
NL8802を取り付けております。
HD650で視聴したところ聴覚上は最も音がよく感じました。

尚、交換したオペアンプはすべて本機の±電源条件内で安定動作するものを選定しています。
I/V段の補償容量を含む帰還ネットワークやLPF定数(約85kHz/約318kHz)は変更していません。
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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: TEAC UD-301 シルバー【高音質化+オペアンプ換装済み】【OPA627 + OPA1612】USB DAC ヘッドホンアンプ
    Notes:
    Customer service hours:
    • Monday to Friday 10:00-18:00
    Customer service hotline:
    Customer Service Email: service@letao.my