作者: ok102006 時間: 2008-10-13 10:44 標題: Antique Sound Lab Headphone amplifiers
Using the original MG-Head OTL MK I, but only mono sound, any ideas? Both OTL and transformer output is the same. I have tried to rotate the 6BQ5 tube...Thanks
作者: 豬頭宅男 時間: 2008-10-13 11:25
ching
乜野叫 mono sound ?
你指得一邊出聲
定兩邊出同一把聲無左立體校果先
作者: ok102006 時間: 2008-10-13 13:37 標題: 回復 2# 的帖子
得一邊出聲, but 出聲邊the sound is ok, no hiss or noise. I already checked the line-in cable, sound source, and headphone, all okay. By the way, this amp sounds very good, some say better than MF X-can V3, it even beats its own MKIII version (with separate power supply).
[ 本帖最後由 ok102006 於 2008-10-13 13:45 編輯 ]
作者: 雪使貓女管家 時間: 2008-10-13 20:34
可能要拆開 check
唔拆之前可以用 rca 入黎試易 d
用普通既線試，先確定條線無問題
交換左右胆都唔得就要拆黎睇下
作者: 豬頭宅男 時間: 2008-10-14 09:10
聽講膽機最易 check - d 膽著唔著先
著晒就先交換左右大膽
無事再換前面枝細膽
都唔得先開機
無 "羅" 就大鑊囉 - 死牛 :funk:
作者: 雪使貓女管家 時間: 2008-10-14 10:13
原帖由 豬頭宅男 於 2008-10-14 09:10 發表
聽講膽機最易 check - d 膽著唔著先
著晒就先交換左右大膽
無事再換前面枝細膽
都唔得先開機
無 "羅" 就大鑊囉 - 死牛 :funk:
OTL 都無聲就唔關輸出牛事
睇下 d 胆燈絲係咪著晒
好少中間果支死得一邊聲道
作者: ok102006 時間: 2008-10-15 15:08 標題: 回復 4# 的帖子
拆開 check, using flashlight and see no burning on the parts, and the smell of the pcb board is okay
交換左右胆, 拆黎, no burning at the feet and socket
use rca 入 --- OKAY, sound is back
Thank you, you are my life-saver
After some testings, I found a strange thing, using the transformer output, everything is ok, but when I unplug the headphone and plug it into OTL output (with the source still playing), the left and right channel swapped (my left ear heard the right channel music), so after all, something must be wrong in the amp...
[ 本帖最後由 ok102006 於 2008-10-15 15:52 編輯 ]
作者: witon 時間: 2008-10-15 15:24
how much is your amp ?
作者: ok102006 時間: 2008-10-15 15:47
can't remember now, many years ago, maybe around $1700
作者: 雪使貓女管家 時間: 2008-10-15 21:48
原帖由 ok102006 於 2008-10-15 15:08 發表
拆開 check, using flashlight and see no burning on the parts, and the smell of the pcb board is okay
交換左右胆, 拆黎, no burning at the feet and socket
use rca 入 --- OKAY, sound is back
Thank you ...
咁個 amp 都做得幾粗糙
如果 rca 正常即係 3.5mm input 果邊問題
應該普通焊接問題
唔想搞既 keep 住用 rca
至於 otl 果邊左右反轉
首先要知道 d 聲既左右正確位置 (即係牛出果邊啱定係 otl 果邊啱)
然後修正錯果邊 ok
作者: ok102006 時間: 2008-10-15 22:02
The amp is working normally and then suddenly went wrong... I probably shocked it somewhere - I use some audio oil to clean the contacts... Anyways I will keep 住用 RCA, when I need to upgrade the tube, I will take it to MOD and repair (yes, 應該普通焊接問題). Thank you for your help.
