review33.com: 影音天地: 我部QUAD 405.2 要改

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[#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

[#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

[#54] 我部QUAD 405.2 要改 (2)
ELNA

alphability

正式會員
218.xxx.xxx.162

2010-06-01 14:37

[#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

[#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

[#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

[#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

[#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

[#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

[#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

[#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

[#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

[#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

[#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