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Yahoo Bid Home Appliances, Audio & Video, Camera Audio Equipment Amplifiers Tube Amplifiers Main Units
★SUN AUDIO/サン・オーディオ★真空管式シングル・ステレオメインアンプ SV-2A3 メンテナンス済み・ 中古現状渡し品
        

SV-2A3メンテナンス済み・中古現状渡し品

トランス頭部、錆・塗装剥離等あり。

球の点灯状態。

球の状態・2A3難あり。

錆・塗装剥離の状態。

  • Product Quantity
    : 1
  • Starting Bid
    :1,000円
  • Highest Bidder
    : Takahashi / Rating:958
  • Listing Date
    :2026年03月16日 18時02分
  • Bidding closes on
    :2026年03月23日 18時50分
  • Auction Number
    :k1223135369
  • Condition
    :Damaged and stained (specify in 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)
  2. The product location is far from the overseas delivery address (Kanagawa), please pay attention to the Japanese shipping fee
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Auction Templates オクのミカタ [ヤフオクの商品追加画像をカンタン設置].


 ●SUN AUDIO/サン・オーディオの真空管式シングル・ステレオメインアンプ SV-2A3メンテナンス済み・ 中古現状渡し品の出品です。知人からの依頼によるもので、惜しくもの出品です。 ・SV-2A3の発売(1989年)から現在に至るまで、世界的に定評のあるタムラ製トランスをシリーズ全機種に採用しています。SVシリーズはキット完成後に一部の部品を交換・追加することで別の種類の出力管へ挿し替え出力管の違いによる新しい音色も楽しむことが可能です。 

 ◆主な特徴◆  ・ 前段は双3極管6SN7GTを(1本/ch)使用した2段増幅。 
                      ・ 出力管の2A3には交流点火方式を採用。 
                      ・ 回路にはNFBを一切使用しない無帰還アンプです。 
                      ・ 配線にはプリント基板を一切使用しないリード線タイプを採用。 
                      ・ トランスは全種(出力、電源、チョーク)にわたりタムラ製作所の特注品を使用。
 
●出品のSV-2A3はベテランのアンプビルダーが製作したもので完成度の高いアンプですが初期の製品と思われシヤーシー・トランス等外装部の初錆・2A3等の経年劣化など見られます。出品時これらの部品の点検・交換及びハムレベルの改善などにより公表のスぺックを凌ぐ仕上がりのアンプになつていますので取りあえず現状で楽しみ、のちに部品・真空管交換等グレードアップも可能かと思われます。 

 ・電解コンデンサー・結合コンデンサー等劣化が想定されものは取り外し容量・損失・外観の目視確認など点検・一部コンデンサーの交換しています。真空管ソケットのクリーニング・ガタツキ等の確認しています。ボリュウーム回転時多少ガリ音でますが、実用上支障ないかと思います。 

 ・残留ノイズ改善のためヒーターバイアス回路新設・B電源のリップル改善のためフイルターコンデンサーの追加で+B回路のAC成分≒35mV→20mVに低減・残留ノイズ(公表値)2.5mV以下→≒1.5mV前後と静かなアンプになっています。 

 ・真空管はTV-7で元気度をチエック。特に出力管2A3は頭部の熱による焼け、変色・袴のグラつき等ありエポキシ系耐熱接着材で固定しています。接着材跡など見栄えは悪いもののゲツターあり。(下段写真1・2・3枚目等)gmの劣化もありますがまだ使用可能かと思いますが寿命は?です。

 ・参考までにメンテナンス後の計測実測値は下段の【SV-2A3の主な仕様 】各項目に比較記入してあります。回路図・実測電圧・電流値などは添付します。メンテナンス時の参考にしてください。無帰還ながら広帯域・低歪率など優秀な出力トランスと増幅の基本をおさえた回路となつています。容量負荷に対する動作の安定性も問題ありません。

 ・本体には汚れ・擦り傷・色褪せ等あります。シヤーシー・トランス等外装部の初錆・2A3等の経年劣化などみられます。写真でご確認ください。年代相応とお考え下さい。

 ・出品時での評価ですので経年劣化による故障・不良を保証するものではありません。納入時の電気的故障・不良のみ無償で修理対応いたします。ただし、真空管は保証外とさせて頂きます。その他、改造・故障・不良時のメンテナンスは有償でお受けいたします。別途ご相談下さい。 中古現状渡し品として返品・クレーム等お受けできませんのでご了承ください。

 【 SV-2A3 の主な仕様 と→計測実測値(右側)】 

 ・使用真空管:6SN7GT x2,2A3 x2,5U4G x1 
 ・出 力:3.5W + 3.5W →≒3.8W + 3.8W ※最大出力 
 ・入力感度: 150mV→ ≒130mV 
 ・出力端子: 8Ω,16Ω →8Ω接続。 
 ・周波数特性:15Hz~30kHz/-3dB→15Hz~50kHz/-3dB ※≒1.4W出力時。 
 ・ノイズレベル :2.5mV以下→≒1.5mV前後。ドリフトあり。 ※球によりバラツキあり。 
 ・外形寸法: W360xH190xD270mm (突起部含む)/重量≒16kg 
 ・備 考: ① 6SN7/出力管2A3はSOVTEK(ロシア製)・5U4GBは東芝製。 
            ② 高調波歪率:1Khz・1.5W時≒0.7% 。
            ③ 各特性は真空管により相違あり。

●送料は落札者様ご負担ください。特に指定なき場合日本郵政・Uパック元払いを予定しています。(補償あり。追跡あり。日時指定可。)
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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: ★SUN AUDIO/サン・オーディオ★真空管式シングル・ステレオメインアンプ SV-2A3 メンテナンス済み・ 中古現状渡し品
    Notes:
    Customer service hours:
    • Monday to Friday 10:00-18:00
    Customer service hotline:
    Customer Service Email: service@letao.my