マラード再版 12AX7/ECC83 マッチドペア オーディオチューブ 強力タイプ 海外 即決

TV7検査済みの真空管について 当店のすべての真空管は、ガス短絡、トランスコンダクタンス、エミッションの検査を行っています。これらの管は厳しい検査をクリアしており、優れた性能を持つ強力な管です。ほぼ新品に近いNOS（ニュー・オールド・ストック）管も含まれ、RCA受信管マニュアルに記載されている平均的な特性範囲内に収まっています。個々の管には特性のばらつきがあることをご理解ください。検査結果はご要望に応じてご提供可能です（写真がない場合も含む）。他にお探しのものがあれば、メッセージをお送りください。必要なものが見つかるかもしれません。真空管は白い箱に梱包してお届けします。リストに記載されていない場合や「オリジナル箱付き」と記載されていない場合は、元の箱は含まれません。当店の真空管の90%以上はTV7検査済みで、TV7は校正済みの信頼性の高い検査器です。TV7は長い歴史を持ち、軍用規格の高い基準を満たす信頼性のある管の検査に使用されています。軍の基準では、管は最低60〜65％の性能を満たす必要がありました。真空管を「新品旧在庫（NOS）」と判定するための明確な指標や結果は存在しません。最も正確なのはGM値を計算し、各管のデータシートと比較することです。一般的にNOS管は平均値と最大値の範囲内のGM値を示すべきです。真空管の検査に関する誤解として、新品やヴィンテージ管はすべて100％のメーター表示であるべきだと考えられがちですが、実際には仕様書に記載された最小値と最大値の範囲内であれば合格とみなされます（TV7の最小値は65％）。また、同じモデルの検査器でも測定結果は異なることがあります。返品は、他の検査器の結果と異なるという理由ではお受けできません。音質にご不満がある場合でも、到着時と同じ状態であればメッセージをお送りください。真空管のロールサービスは提供しておりません。ヴィンテージオーディオ用管はバーニングイン期間が必要で、その期間中に最も良い音が出ます。ノイズテストについては、特別な確認のためのものであり、ヘッドフォンを使った聴取やアンテナ・グラウンド端子への接続が可能な検査器もありますが、これはあくまで補助的なものであり、実際のアンプやシステムでの動作を保証するものではありません。最良の方法は、実際のアンプや類似の環境でのテストです。ノイズやマイクロフォニクスの検査は、実際の使用環境に近い状態で行うことが最も効果的です。これらの問題は稀であり、適切に設計された回路ではほとんど発生しません。ご購入前に使用予定のデータシートを必ずご確認ください。 返品について お客様にご満足いただけるよう努めております。購入前後にご不明点やご要望があれば、必ずメッセージをお送りください。返品は、eBayのポリシーにより、「不良品」や「説明と異なる」などの理由ではお受けできません。検査結果の違いによる返品はご遠慮ください。なお、真空管のシルクスクリーン（文字印刷）は非常に壊れやすいため、取り扱いには十分ご注意ください。

商品説明文の原文は、こちらをご参照ください。

Tv7 tested TUBES All our tubes have been tested for GAS SHORTS TRANSCONDUCTANCE & EMISSIONS These tubes have been tested; they are excellent strong tubes testing near nee NOS tubes fall within the Gm characteristic range of an average tube, as published in the RCA RECEIVING TUBE MANUAL, which states "Individual tubes, like any manufactured product, may have characteristics that range above or below the values given. Test Results are ALWAYS available upon request (if not photographed) Looking for something else and want to save on shipping ? Send me a message! I might have what you need! Tubes will be packaged in white boxes - if the original boxes are not photographed in the listing or stated as with original box they are not included. 90 % of our tubes are Tv7 tested, our tv7 is Calibrated and our go to tester. The tv7 tester has been around a long time and is a trusted tester for military, who had high standards for reliable tubes that would not fail in critical conditions. Military standards were tubes needed to meet 60/65% which they established as (minimum value) There isn't a specific indicator or result or data set anywhere that universally designates a vacuum tube as "new old stock" when using a tester nor for what test result is given. The best way is to calculate the GM - and check the data sheet for each tube - a nostube should typically measure between the average and maximum micromhos(GM) A common misconception of tube testing is that every unused tube, new or vintage, should test at 100% of the meter scale of the tester. A tube was considered acceptable/new/ passed standards if it tested between the specified minimum and maximum on a tube data sheet or the minimum value specified on the tester (tv7 is minimum is 65%) Tubes do not give the same reading across testsrs - even the same model tester will give a different reading sometimes.RETURNS ARE NOT ACCEPTED BECAUSE YOUR TESTER SAYS SOMETHING DIFFERENT THAN MINE. If you dont like the sound of a tube, so long as it is still in the same condition as arrived message me. I DO NOT OFFER A TUBE ROLLING SERVICE, vintage audio tubes typically require a burn in period, thats where the tube sounds the best. :) Please see my notes on noise tests below ***We have a few different testers available to ensure the quality of the tube***** (as some tubes can not be tested on the tv7) Tv7 testing is tedious and I spend hours testing tubes and double testing tubes - if you notice a mistake(like a picture doesnt match the title) please be gracious and let me know. UNLESS PHOTOGRAPHED WITH THE ORIGINAL BOX- tube will come in repackaged white boxes- 50-90 year old cardboard packaging doesnt hold together well, not in my hands anyways. ***we have over the last 20 years amassed a huge collection of vintage amps/ parts / tubes and have decided to downsize that collection. Every tube has been marked for tracking and security purposes - these marks wipe off easily and without the mark no return will be accepted - Sound quality is tremendously SUBJECTIVE. Please let us know what your intended application is prior to purchase if you have a specific sound in mind and/or just dont know what you want. Tube tester NOISE TEST. This is a very marginal test, only for special checking. This test needs sound amplification; hearing / listening to noise with headphones would indicate a real disaster inside a tube (THE shorts test WOULD already BE evidence OF THIS ) some testers do have noise test jacks that connect to either headphones or to the antenna/ground terminals of an AM radio. There is nothing wrong with performing that noise test however *****that test is not going to tell you whether the tube will be silent in your SET (single ended triode) amp or in anything else************Ultimately, the best way of testing a tube for microphonics is in an actual chassis or amplifier similar to one in which it is intended to be used********* Since amps have a wide variety of circuit designs and tube placement, this test is most effective in YOUR AMP or one that is almost identical.Hence, most people advertising tubes as tested for Noise or Microphonics are probably NOT testing them in any meaningful way FOR YOU OR YOUR AMP. Noise and Microphonics are often buzzwords for other issues.(Shorts/ leaks) -there is a small percentage of tubes that have a problem with noise but far less than most people think. *****In properly designed circuits objectionable tube noise is seldom found. *******In other words, it is a rare tube that will be noisy when used in most circuits. Always check the data sheet of the tube you plan to use. 1. RETURNS: I want you completely satisfied with your purchase from me. I will bend over backwards to make sure that you are a happy customer, prior to and after purchase. PLEASE message me BEFORE you open a return. Additionally please note that you can not return a tube for reasons against eBay policy- saying defective or not as described because your different tester reads the tube different is unacceptable. PLEASE NOTE: Tube silkscreen (lettering on the tubes) is VERY fragile. It can be wiped off and destroyed VERY easily.

※海外から商品を発送するため、お届けまで3週間前後お時間を要します。