- #43 [Hellonoel], 20-01-14 12:24Happyquad 師兄。我有部2005年 quad 909 年多前二手買回來，近來發覺有一邊出聲時有時冇，想維修。可否pm我聯絡方法？謝謝
- #42 [happyquad], 18-05-12 23:23BrufenL師兄:請再Check PM Thanks!
- #41 [happyquad], 18-05-12 15:40lbut師兄:
Please check PM Thanks! -
- #40 [happyquad], 18-05-12 11:53brufenl師兄:
Please check P.M.Thanks! - #39 [spyder], 18-05-07 18:09#35
收到，謝 HAPPYQUAD 兄。 - #38 [happyquad], 18-05-07 13:20Quad 405早期版,原裝機內結構圖.
- #37 [happyquad], 18-05-07 13:03Quad 405早期版,原裝機的背後.
- #36 [happyquad], 18-05-07 12:59Quad 405早期版,原裝的主放大瑰,
功率管用東芝2SD424
- #35 [happyquad], 18-05-07 12:55Spyder 師兄:
405 不播歌，靜態開住也很熱，是正常的嗎?
**不正常**,Please check PM Thanks!
- #34 [happyquad], 18-04-11 12:04mcheung89師兄
Please check PM Thanks!
最後修改時間: 2018-04-11 12:07:34 - #33 [mcheung89], 17-09-23 02:40Happyquad兄,
小弟有部405.2想請您維修,可否PM我留聯絡方法詳談?
謝謝! - #32 [國產007], 17-08-14 17:00師兄我有部405-2隻牛响又震， 如果想搵師兄你訂一隻原裝牛 及幫我更換埋需要幾多錢呢？
- #31 [happyquad], 16-11-12 10:00國產007師兄:
Check PM Thanks!
- #30 [happyquad], 16-11-11 10:44國產007師兄:
**有冇得維修**有的!
方便請留電 Thanks!
最後修改時間: 2016-11-11 10:55:05 - #29 [國產007], 16-11-11 00:39師兄，我有D問題想問一問你架，我有部405-2後级開機聽熱咗後部後级就會發出胡胡聲，聽得越來胡胡聲就越大聲， 究竟有_什麼事呢，有冇得維修維修會唔會好貴呢，謝謝師兄。
- #28 [happyquad], 16-07-23 17:37vti師兄:
小弟有部405-2，發現有震盪情況出現。
現想換牛，環牛可以了，請問可否代行更換？請問大約多少錢？
Please Check PM Thanks! - #27 [happyquad], 16-07-16 10:26vt師兄:
Please Check PM Thanks! - #26 [shungyan], 16-05-27 14:22其實有師兄劏過405 隻牛睇過? 唔知道邊度見過D網話佢唔係EI 牛. 而係名貴嘅雙c牛嚟！
- #25 [baker.steven], 16-05-27 11:33Me TOO!
- #24 [alphability], 16-05-27 11:18＞＞ 换OP，改细GAIN
我做過，我2010年真係做過
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!)..."
http://m.review33.com/forum_msg.php?db=1&tstart=0&s=405&topic=12090324162805&number=56
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Quad 909 維修