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| 影音天地主旨 ﹝請按主旨作出回應﹞ 上頁 首頁 | 寄件者 | 傳送日期
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| [#41] 我部QUAD 405.2 要改 QUAD OFFICIAL REPLY! THEY ARE EXTREMELY HELPFUL!  |
alphability 正式會員218.xxx.xxx.164 |
2009-04-19 00:25 | |
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| [#42] 我部QUAD 405.2 要改 (2) 原裝 英國製造 TI TL071CP (原來 TI 當年英國有廠房製造IC) 新歡 泰國製造 BB OPA604AP  |
alphability 正式會員 218.xxx.xxx.164 |
2009-05-06 20:41 |
| [#43] 我部QUAD 405.2 要改 (2) 為保存 QUAD 原聲， 只改 OPAMP 其他零件完整保留  |
alphability 正式會員 218.xxx.xxx.164 |
2009-05-06 21:37 |
| [#44] 我部QUAD 405.2 要改 (2) TL071 OPAMP 實在太舊， 電源最簡單方式補償 QUAD-405 Modification (and related stuff), version 1/2004 "...Two ~100nF-caps (here cheap ceramics are first choice!) from the OpA's powersupply pins (7 and 4) to ground (pin 3 in this case) are imperative. Otherwise most of the 'modern' Audio-OpAs will have a tendency to ringing or even to rf-oscillation (despite their better PSR-ratios!)..." http://quad405.com/405mods4.pdf |
alphability 正式會員 218.xxx.xxx.164 |
2009-05-06 22:26 |
| [#45] 我部QUAD 405.2 要改 (2) cheap ceramics? 用WIMA都唔係好貴  |
alphability 正式會員 218.xxx.xxx.164 |
2009-05-06 22:29 |
| [#46] 我部QUAD 405.2 要改 (2) 開聲! 高音通透得很! 中音人聲冇大改變 ^^" 低音清楚繼而薄了一點, 不過感覺快 非常 HIFI 最重要, QUAD 那份 MUSICAL 依舊保留 |
alphability 正式會員 218.xxx.xxx.164 |
2009-05-07 01:14 |
| [#47] 我部QUAD 405.2 要改 (2) 香港市電實在太噪 要執執先 背景靜到呢～～～ ^.^  |
alphability 正式會員 218.xxx.xxx.164 |
2009-05-09 01:01 |
| [#48] 我部QUAD 405.2 要改 (2) so fast, one year now, let me do some update here. I did the OpAmp Mod based on the following article: http://quad405.com/405mods4.pdf |
alphability 正式會員 218.xxx.xxx.162 |
2010-04-29 01:01 |
| [#49] 我部QUAD 405.2 要改 (2) 每次打開QUAD 都有陣 松香膏 氣味,是英國獨有 (最惡頂十年前國內電器松香膏氣味會流眼水)  |
alphability 正式會員 218.xxx.xxx.162 |
2010-04-29 01:07 |
| [#50] 我部QUAD 405.2 要改 (2) 聲音通透無比 OpAmp BB OPA604AP, 降低OpAmp放大率， 對聲音好重要!! Note from BerndFritzLudwig "To reduce gain of the input-stage...Local feedback: Close to the OpA there is one MKT-capacitor C4 =47nF connected to R6=330k. Add [1] C4'=100nF (same type) across C4. Add [2] R6'=150k across R6=330k. Overall feedback: Two 22k-resistors are connected to pin 2 (inverting input of the OpA): R3 which leads to the input cap C1=0.68uF and R4=22k which leads to C2=100uF. Add [3] R4'=10k across R4=22k (not across R3!)..."  |
alphability 正式會員 218.xxx.xxx.162 |
2010-04-29 01:17 |
| [#51] 我部QUAD 405.2 要改 (2) CAP CAP CAP "...Two ~100nF-caps (here cheap ceramics are first choice!) from the OpA's powersupply pins (7 and 4) to ground (pin 3 in this case) are imperative. Otherwise most of the 'modern' Audio-OpAs will have a tendency to ringing or even to rf-oscillation (despite their better PSR-ratios!)..."  |
alphability 正式會員 218.xxx.xxx.162 |
2010-04-29 01:22 |
| [#52] 我部QUAD 405.2 要改 (2) RECAP RECAP RECAP 聽過 LS3/5a BASS 打心口未， 功勞歸 M 不過德國製品，SOMEHOW破壞QUAD英國聲底 :P （註: 我反對人地用M， 應用新一代BHC)  |
alphability 正式會員 218.xxx.xxx.162 |
2010-04-29 01:26 |
| [#53] 我部QUAD 405.2 要改 (2) 我部Quad 405-2都想換OPAMP/Recap. 有冇C-Hing可以代幫手^^ |
GaryL 正式會員 112.xxx.xxx.187 |
2010-05-22 11:58 |
| [#54] 我部QUAD 405.2 要改 (2) ELNA  |
alphability 正式會員 218.xxx.xxx.162 |
2010-06-01 14:37 |
| [#55] 我部QUAD 405.2 要改 (2) Blackgate (NONPOLAR)  |
alphability 正式會員 218.xxx.xxx.162 |
2010-06-01 14:38 |
| [#56] 我部QUAD 405.2 要改 (2) 尋找新主人中。。。  |
alphability 正式會員 218.xxx.xxx.162 |
2010-06-20 21:22 |
