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AIR TIGHT　ATM-300　ステレオ?シングル?パワーアンプ（出力管別）?商品説明　　■ AIR TIGHT　エアータイト　ATM-300　ステレオ?シングル?パワーアンプ（注：出力管別）　　
（注：写真の出力管WE300Bは付属していません。）　　 ATM-300取扱説明書（Owner's Manual）　　 AIR TIGHT総合カタログ　　 ATM-300梱包元箱　■ 目だった傷や凹みはありません。（写真をご覧ください。）　　 使用時間は、100時間程度（サブ機器として偶に接続しました。）　　 写真撮影のため出力管WE300を挿入しましたが、出力管は付属していません。ご注意ください。　　 お好きなメーカーの出力管300Bをご使用ください。　■ ATM-300の仕様（カタログより）　 出　 力8W＋8W（8Ω）使用真空管300B×2、5U4G×1、12BH7A×2、12AU7A（ECC82）×2入力インピーダンス100kΩ寸　 法430×275×245mm（W×D×H）重　 量24kg　■ ATM-300の特徴（カタログより）　　 出力管に300Bを使用　　 ドライバー段は３極管に拘り、３段構成ドライブ　　 出力段の300Bは、自己バイアスによる純A級動作　　 直熱管特有のヒーターハムノイズ対策のため、３極管のヒーターは直流点火（更にハムバランサーで最小点に調節可能）　　 詳細は、エイ?アンド?エム株式会社AIR TIGHT公式ホームページ（/）をご覧ください。　■ 不具合は全くありません。正常に動作しています。（2011年4月購入）　■ 発送は、ヤマト宅急便を予定しています。?注意事項　　■ ご入札は速やかにお取り引きできる方に限らせていただきます。　　 落札後48時間以内に連絡が無き場合、落札者都合で繰り上げを行います.　　 この場合、オークションシステムから落札者に対して、自動的にマイナスの評価がつきます。　■ その他　　?振込み手数料はご負担ください。　　?切手?商品券でのお支払いはお受けしていません。　　?発送は入金確認後、2～3日程頂く場合があります。　　?落札後のキャンセルは一切お断りしております。　　?細かな点、完璧を求められる方は入札をお控え下さい。　　?商品の状態については、極力詳しくご説明をしておりますが見落とし等がありました場合、ご了承下さい。　　?ノークレーム、ノーリターンでお願いします。　　　　　?支払方法　　　■ かんたん決済　■ 三菱東京UFJ銀行、みずほ銀行　■ ゆうちょ銀行（郵便振替）　
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扫一扫关注我们Aikido Detour and R15 & R16 math and coupling capacitor issues
17 April 2006&&&
Today&s blog entry was supposed to be on using the Aikido amplifier as a headphone amplifier, with special emphasis on making our new Aikido PCBs the foundation for such an undertaking (since we have them, we should put them to
good use).
Well, this topic must be postponed until the next blog entry, as I have to perform some conceptual housekeeping before littering your mind with any more new interesting projects. (Besides, I am not done drawing the headphone amplifier schematics and I am waiting for some more feedback from a few readers who blazed ahead and our using the Aikido as
headphone amplifiers.)
The tipoff came from longtime reader, Paul, who told me that he measured more noise at the output of his Aikido after replacing his two 100k voltage-divider resistors with two resistors that followed the noise-voltage-divider formula,
&&&&& Resistor ratio = 1/mu + ½
or (for those with my Aikido PCBs)
&&&&&& R16 = R15(mu + 2)/(mu - 2)
I have received enough e-mail from Paul to know that he can teach me plenty about carefully measuring an amplifier, so it was unlikely that he had incorrectly measured the noise. In fact, he had tested the resistor values with a VOM and he had tried other ratios and other 6SN7s, but always the two 100k resistors worked best. I was about to pull out my hair, when I asked if the bottom resistor was the larger. He replied that it wasn&t, but also noted that that wasn&t what I had posted here&and he included a screen capture of the Aikido schematic. He was right: I had posted the wrong order in several of the Aikido schematics. (I have since corrected
the erroneous schematics.)
What a headache. First, there was the same error in the PCB user guide PDFs, now this. How did it happen? Easy. First, I used a different formula than the one I posted, which a my formula
yields the same ratio, but does not lead to division-by-zero errors with a 6AS7 triode (I think like a programmer):
&&&&& R15 = R16(mu & 2)/(mu + 2).
For example, a 6AS7&s mu of 2 renders R15 = 0, rather than R16 equals infinity. So I am accustomed to changing resistor R15&s (the top resistor's) value and leaving R16 (The Bottom resistor) fixed at 100k in my own design work and experiments. But I figured it was best to use the other formula on this website. Unfortunately, it proved harder to do than I expected. In other words, feel free to use either formula, but do so consistently.
Second, I cut and paste a great deal when drawing schematics, which means that an error can spread from one schematic to the next.
Yet even after I thought I had fixed the PDFs, I was told that the PDFs still read the same. Madness. I used my FTP program to open the PDFs at the website and, indeed, they had been updated. However, when I downloaded them, they hadn&t been. What was going on? It turns out that you have to press the reload button on your web browser, otherwise it just keeps loading the old PDF from its cache on your hard drive, not the revised PDF off this website.
The table below uses a fixed 100k R16 resistor value and show R15 in exact and the closest standard 1% resistor values.
*Tube cannot be used with the 9-pin Aikido PCB and is only listed for reference.
First, how large in value do the output coupling capacitors have to be? Two variables come to play. The first is the load impedance to be driven and the second is the desired low-frequency cutoff. Then all that is needed is this simple formula:
&&&&& Capacitor value = 159155 / Frequency / Resistance
The answer is in &F. For example, a cutoff of 100Hz and an input impedance of 47K would require a coupling capacitor of 0.0339&F, or after rounding to the closest standard value, 0.033&F. Another example: 5Hz and 100k requires 0.31831&F, or after rounding to the closest standard value, 0.33&F.
Can both outputs (from coupling capacitors C1 and C2) be used at once, with each one driving its own amplifier? Yes, indeed. Why would anyone want to do such a thing? I can think of several possibilities. For example, a bi-amped system could be easily assembled, using one of the coupling capacitors to limit the low-frequency energy to small satellite loudspeakers, while the other feeds the bass amplifier that powers the subwoofers. Thus, small and expensive coupling capacitors can be used for the high-frequency outputs and large&but cheap&coupling capacitors can be used for the low-frequency outputs.
Or one set of coupling capacitors could be used for a dedicated, solid-state, low-input-impedance headphone amplifier, while the other is used for a high-impedance tube power amplifier. I am sure that many of you will find other uses for the two coupling capacitors.
Here's a question I have gotten twice, which means there 200 hundred readers wondering the same thing: How do I wire up a rotary switch for switching between the two coupling capacitors? We need a four-pole, three-position switch and some hookup wire. All four coupling capacitors attach to the input contacts and the two channels of output can receive either coupling capacitors C1&s or C2&s or both capacitors& outputs. The drawing below shows the knob on the faceplate and the rotary switch from behind. (The switch is shown on the &C1 + C2& position.)
(Here is where it all began, back in 2004)
Sorry for the quick detour. Next time, the promised headphone amplifier circuits.
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