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eardoctor: 50年代的Siemens CCa特色是有明顯的D環
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eardoctor: 再換上新的Siemens CCa，不上套環
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eardoctor: Mullard ECC83長屏方環是它的特徵
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eardoctor: 會不會是老化？換上新的Mullard ECC83 57'
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eardoctor: 結果有哼聲和麥克風效應，又來回至少十次
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eardoctor: 一樣套好Siemens E188CC
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eardoctor: 懷疑是V5上面的Siemens E188CC，索性也套上
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eardoctor: V1 V2都上套環，但是改善很有限
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eardoctor: 一樣套好套滿
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eardoctor: 繼續嘗試，把V1的Mullard 10M也套上去
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eardoctor: 放孿來的V2上面，結果影響不大
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eardoctor: 兩支都套好了
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eardoctor: 用在調味道的Mullard ECC83 57'，但是底噪比較高
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eardoctor: 一直要套到底座看不到
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eardoctor: 換上Ensemble的真空管套
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eardoctor: 第一個副標，V2的Mullard ECC83 長屏方環
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eardoctor: 2020-09 19 Mullard ECC83 56’、57’長期屏方環(綠色為醫療等級標示)
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eardoctor: 2020-09 16 Mullard 10M
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eardoctor: 2020-09 14 Philips 1957長屏D環、Mullard 10M，TFK ECC803S音色都不相同
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eardoctor: 2020-09 13 TFK ECC803S
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eardoctor: 2020-09 12 Philips ECC83 長屏D環 1958
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eardoctor: 2020-09 10 TFK ECC803S這很難仿造
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eardoctor: 2020-09 09 TFK ECC803S
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eardoctor: 2020-09 05再來看看管子排列有，沒有更好的可能
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eardoctor: 2020-09 04上機測，果然差了一半
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eardoctor: 2020-09 03看起來就是它有問題
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eardoctor: 2020-09 02上蓋打開很方便
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eardoctor: 2020-09 01 Hickok TV7D/U測管機
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eardoctor: Mullard ECC82 ribbed plate - 4
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eardoctor: Mullard ECC82 ribbed plate - 3