- #46 [shungyan], 16-09-05 17:37我就將405 由0.5v 變咗做1v
- #45 [georgefwy1977v2], 16-09-05 16:47I usually put up the input sensitivity up to 2V when I connected QC24 tube preamp several years ago, 0.5V input for 405-2 is a BIG headache for tube-pre owner
- #44 [happyquad], 16-09-05 16:43Quad 405-2 接 tube pre amp **開始時底噪大到三呎都聽到**
這種玩法噪音經常會有的.因為膽前易產生噪音.
輸入露敏所致.
師兄你是高手,能解決問題Very Good多多指教分享!
Thanks! -
- #43 [shungyan], 16-09-05 14:14我新近買咗部sonic frontiers sfl-1 去推部quad 405, 開始時底噪大到三呎都聽到。 後來發現係粒輸出mosfet irf730 老化。 diy 買料(2 蚊粒) 換咗之後, D底噪静到原子粒機噤! 要貼哂隻耳落去先聽到
- #42 [shungyan], 14-04-25 21:02Hi Ching,
Hope that both of your amps has no problem but just some minor stuff!!! Below show someday people pair Luxman CL350 with quad 405
http://www.hilberink.nl/codehans/luxman4.htm - #41 [leicam6classic], 14-04-25 14:44未有時間試呀...ha, 想試下部audiolab 8000a接上去試下, 仲有沒(大)低噪, 想攪清楚是我部cl36問題定405.2太靈敏的問題...
- #40 [shungyan], 14-04-25 14:14Ching,
How is your quad 405-2??? Problem fixed? - #39 [ozrayyau], 14-04-21 07:46大改 QUAD 405.2
- #38 [leicam6classic], 14-04-20 21:38Got it thanks !
- #37 [shungyan], 14-04-20 20:06leicam6classic hing,
没有甚麼的! 只是記得當日剪原裝din線駁rca時個ground 同想象中有D出入! 不過駁錯咗部野會dee dee 聲! - #36 [leicam6classic], 14-04-20 01:22shungyan兄
Thank u your comment...
我是用RCA to DIN,....接地嗎, 我條線就咁一條無接地播, 會不會低躁由線做成呢? 一般應該用邊款DIN線? 你改了RCA出嗎? - #35 [shungyan], 14-04-17 14:36Hi Leicam6Classic ching,
Your amp board looks ok and should hvae re-capped. Only the output transistors seems to be replaced. The main cap may need replacement as well.
You still keep the DIN connection, did you make the RCA to DIN cable by your own? Beware of the ground arrangement. - #34 [leicam6classic], 14-04-17 12:54麻煩幫幫眼
- #33 [leicam6classic], 14-04-17 12:54麻煩幫幫眼
- #32 [leicam6classic], 14-04-17 12:54麻煩幫幫眼
- #31 [leicam6classic], 14-04-17 12:53麻煩幫幫眼
- #30 [shungyan], 14-04-17 08:23leicam6classic 兄,
不敢斷言,但看似是你的405-2 有事! 先確定一下,hum 聲是從嗽叭來,不是來自機身吧?
買回來後有没有把機板上的電解電容換掉? 二十來年的機,很多電解電容都死了! 也導至有hum 聲! 玩405 diy 少不了的! 也會很有樂趣! 建意将底板上的c5 c10 換掉看看吧! 另外小心主電容水塘老化,死前會火山爆發! 一拼換掉安心很多! 用回黑色bhc 貨! 都是quad 的聲!
上個内外圖看看吧(其實看不出多少,八卦矣)
還有,朋友用在92db 的104.2 身上,耳仔貼住嗽叭都冇乜hum 聲!
google 一下 quad 405 service data. download 下來看看,很有用!
最後修改時間: 2014-04-17 08:37:43 - #29 [leicam6classic], 14-04-17 01:05shungyan兄, 我剛入手405,夾luxman cl36,唔唱歌在安靜環境下, 離箱一兩尺可以"聞到", 當時是用JBL 4312A, 改插revox722後級,基本隻耳貼埋去先有聲,先至懷疑是否機唔夾,
之後可能試一下我對celestion sl6si,因為相對是比較難推的喇叭,睇睇hum聲會不會好D。
baker.steven兄, 謝你的意見和資料,對我呢個初玩405的好有用, thz a lot. - #28 [baker.steven], 14-04-16 23:39"改咗 input sensitivity 對hum 聲幫助不太大"
無論膽前或石前,夾一部正常的405,冇可能有hum,若前級有微弱的交流聲,因405電壓放大增益高,會比較明顯。 - #27 [baker.steven], 14-04-16 23:24
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