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Yahoo Bid Home Appliances, Audio & Video, Camera Audio Equipment Amplifiers Tube Amplifiers Main Units
ファインメットコア出力トランス使用 クラーフ結合式 300Bシングルステレオアンプ
        

  • Product Quantity
    : 1
  • Starting Bid
    :100円
  • Highest Bidder
    : 安田金車 / Rating:36
  • Listing Date
    :2026年03月09日 21時40分
  • Bidding closes on
    :2026年03月17日 08時37分
  • Auction Number
    :b1222343305
  • 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 may be dented or collapsed, please ask clearly and pay attention before placing a bid.
300B無帰還シングルステレオアンプ、自作品です。

ファインメットコアをダブルで使用した出力トランスを使用しています。

出力インピーダンスは8Ωに合わせてあります。はんだ付けが必要ですが4/8/16Ωのいずれかが選択できます。

ファインメットコアは磁気飽和が急峻で珪素鋼板の様に粘らないので出力トランス、

特に直流電流を流して使用するシングルアンプには不向きですが、このアンプではクラーフ結合方式を採用し、

出力トランスには音声信号のみを流すようにすることでファインメットコアの弱点を回避しています。

回路はいわゆるWE91Bタイプのクラーフ結合版のような感じで、初段C3gを5極管として使用し、そのまま300Bをスイングします。

300BにはPsvaneのWE300Bを使用しています。2018年製、元箱とシリアルナンバーが書かれた検品書が付属します。

周波数特性は大体7Hz~53kHz(-3dB)と無帰還シングルにしてはかなり優秀です。

整流管5U4使用時、B電圧340V、Ip=65mAとなり、最大出力は約7.5W(THD+N=5%)となります。

最大プレート損失に余裕があるので5AR4やGZ34を使用すればB電圧が上がるのでもう少し出力取れますが7.5Wも出ていれば十分と思います。

出力トランスに直流を流さないクラーフ結合方式なのでトランスの配線を背面のコネクタに引き出す事によって、色々なトランスをつなげられるようにしています。

配線折り返しのソケットを使用すれば本体搭載のファインメットトランス、ワニ口クリップ付きのソケットを使用すれば、様々な外付けトランスの音を楽しむ事が出来ます。

球の使用時間はまぁまぁあると思いますが寿命近いということは無いです。

出品にあたり、各部検査、測定、試聴して異常の無い事を確認しています。

出品物はアンプ本体、球一式、外部トランス接続用のワニ口ソケット、電源ケーブルです。

外装、キズ多いですが凹みや曲がりはありません。

売り切り、激安からの出品です。

どうぞよろしくお願いいたします。

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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: ファインメットコア出力トランス使用 クラーフ結合式 300Bシングルステレオアンプ
    Notes:
    Customer service hours:
    • Monday to Friday 10:00-18:00
    Customer service hotline:
    Customer Service Email: service@letao.my