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グライコ Victor SEA-33 【超高音質に改造】OPアンプ+コンデンサ換装
        

商品外観

操作部拡大

背面と側面

JRC NJM4560⇒BB OPA2134に換装

ソケット式:好きなOPアンプに変更可能

交換したコンデンサ。長期的安定性確保

  • Product Quantity
    : 1
  • Starting Bid
    :5,000円
  • Highest Bidder
    : Hanaa / Rating:169
  • Listing Date
    :2026年03月14日 15時12分
  • Bidding closes on
    :2026年03月21日 15時11分
  • Auction Number
    :e1218578270
  • Condition
    :State it in the description
  • 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

商品に興味を持っていただき、ありがとうございます。

グライコ Victor SEA-33 【音質向上の為、OPアンプ+コンデンサ換装】
です。

【改造の背景】
①製品概要は下記のURLをご覧ください。
https://audio-heritage.jp/VICTOR/etc/sea-33.html
”上級機と同じ半導体インダクター回路を用いた左右独立10素子構成のグラフィックイコライザー。”
とあります。

②SEA-33の構成は非常にSimpleで入力側にインピーダンス変換と半導体インダクターに送るOPアンプ1発、
送り出し側にOPアンプ1発という簡単な構成です。
Simple is Best!!・・・・・色が付く素子が複雑に連なっていない。複雑な回路ほど素子の影響を受けます。当たり前ですが。

③以前 Tchnicsの高級イコライザTechnics SH-8065の仕様 テクニクスを使っていましたが処分。
 あまりにも色が付く。

SEA33構成を見て閃きました。下記の改造です。


【改造内容】
 ①SEA-33の搭載OPアンプはJRC NJM4560です。
  ・ひずみ率:データシートに表記無し
  ・ノイズレベル:データシートに表記無し
  ・データシートは下記URL
https://www.datasheetbank.com/ja/preview/NJM4560-JRC

 ②換装したOPアンプ:BurrBrown OPA2134
    これを選択したのは、録音~マスタリングに使うので、いい音に聞こえるより色付けが無いクリアさを求めたからです。
  ・Ultra-low distortion: 0.00008%
  ・Low noise: 8nV/√
   と言うとんでもないもので、データシートには”Professional audio and music”用と書かれています。
  ・データシートは下記URL
https://www.ti.com/lit/ds/symlink/opa2134.pdf?ts=1762365563978&ref_url=https%253A%252F%252Fwww.mouser.it%252F

 ③OPアンプの取付
  ・8Pinソケットを実装しましたので、OPA2604、MUSES8920、LME49860、LT1364など低歪率のお好みの2回路OPアンプに入れ替えも出来ます。   ただし、自己責任で行ってください。

 ④コンデンサ類は経年変化で容量減少、リークなど痛みやすいので、OPアンプ周辺に使われるコンデンサを最新のものに入れ替えました。

結果】
  ・音は視界が晴れて、原音がよく見える。
  ・入力信号と比較しても聞き分けられませんでした。(SONYモニターヘッドフォン MDR-CD900ST使用。)
  ・実際の応用で2025/10にジャズを録音し、マスタリングする際、音場補正に使用しまし、効果を確認しました。

  ・実測値:    条件は①スライダFlat ②SEA-ON ③広域はイコライジング最高音の16KHz。SinWave、三角波は完璧。オーディオ帯域では全く問題無し。
 
【状態】
  ・ボンネットは光沢を保っています。一部擦り傷にタッチアップペイントしました。写真をご覧ください。
  ・SEAスライダーノブにガリはありません。
  ・切り替えスイッチ動作も良好です。

【SEA-33 概要】
  ・メ ー カ ー:日本ビクター
    ・品     名:グラフィックイコライザー
  ・SEA中心周波数:31.5/63/125/250/500/1k/2k/4k/8k/16kHz
    ・歪     率:0.005%(20Hz~20kHz、2V出力時)
  ・SN比(IHF)  :115dB
  歪率とSN比はOPアンプを変えたので、未測定ですが良くなっていると思います。

【SEA-33 仕様】
  ・Line入力インピーダンス:47KΩ
  ・Tape入力インピーダンス:47KΩ
  ・Line Out       : 2V (最大7V)、出力インピーダンス100Ω
    ・Tape Out       : 2V (最大7V)、出力インピーダンス100Ω
    ・ゲイン        : ±0dB
    ・周波数応答      : 10Hz~50kHz
    ・信号対雑音比     :115dB
    ・全高調波歪み     : 0.005% (20 Hz - 20 kHz)
    ・制御ゲイン範囲    : ±12dB
    ・制御周波数の数    :10(R+L=20スライダー)
    ・イコライジング中心周波数: 31,5、63、125、250、500、1K、2K、4K、8K、16KHz
    ・制御範囲       : ±12dB
    ・SEA Defeat      :±0dB
    ・SEA On        :±0dB
    ・ATTENUATOR On     :ー6dB
    ・ATTENUATOR Off    :±0dB
    ・ACアウトレット    :1個、150W
    ・消費電力       :15W
    ・寸法         :435 x 61 x 265 mm
    ・重量         :3Kg
    ・仕上げ        :シルバー
    ・生産期間       :1983~1986

【お支払い、送料、お渡し】
  ・支払い方法 :Yahooかんたん決済
  ・輸    送 : 宅急便
  ・大 き さ : 100サイズ
  ・重    さ : 5Kg(梱包後)
  ・発    地 : 横浜市
  ・発    送 : 入金確認後1~2日
   ・置き配 : 置き配が不可能な場合は時間をご指定ください。

【その他】
  ・入札終了時間ギリギリの質問は回答出来ない場合があります。
  ・思ったより送料が高かった等、落札後のキャンセルはお受けできません。
   ・落札後の連絡なしがあり困惑したことがありましたので、落札終了から48時間以内に送付先等のご連絡が無い場合は、入札の取り消しをする場合がありますのでご了承下さいませ。
  ・商品到着後「受取連絡」をお願いいたします。

宜しくお願い致します。 




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

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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: グライコ Victor SEA-33 【超高音質に改造】OPアンプ+コンデンサ換装
    Notes:
    Customer service hours:
    • Monday to Friday 10:00-18:00
    Customer service hotline:
    Customer Service Email: service@letao.my