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| 影音天地主旨 ﹝請按主旨作出回應﹞ 下頁 尾頁 | 寄件者 | 傳送日期
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| [#1] 5687牛輸出前級(Baker.Steven) 牛輸出前級，重中之重當然是輸出牛，比利時Monolithic Magnetic ，Nanocrystalline core 當然是首選，接4：1，次級並1K電阻，初级反射抗阻16K，牛前線路简潔.只需要pot 條loadline，揀個理想工作點，計返粒陰極電阻數值就OK，呢次部機做dual mono，牛都2隻，Vol & Selector架都分開2隻，電源穩壓就用Diytime出品，裝製無什麼難度，唯一喺金工對位要準確D!  |
Baker.Steven 正式會員203.xxx.xxx.196 |
2024-10-29 11:17 | |
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| [#2] 5687牛輸出前級(Baker.Steven) .  |
Baker.Steven 正式會員 203.xxx.xxx.196 |
2024-10-29 11:18 |
| [#3] 5687牛輸出前級(Baker.Steven) .  |
Baker.Steven 正式會員 203.xxx.xxx.196 |
2024-10-29 11:19 |
| [#4] 5687牛輸出前級(Baker.Steven) .  |
Baker.Steven 正式會員 203.xxx.xxx.196 |
2024-10-29 11:19 |
| [#5] 5687牛輸出前級(Baker.Steven) .  |
Baker.Steven 正式會員 203.xxx.xxx.196 |
2024-10-29 11:20 |
| [#6] 5687牛輸出前級(Baker.Steven) .  |
Baker.Steven 正式會員 203.xxx.xxx.196 |
2024-10-29 11:21 |
| [#7] 5687牛輸出前級(Baker.Steven) .  |
Baker.Steven 正式會員 203.xxx.xxx.196 |
2024-10-29 11:21 |
| [#8] 5687牛輸出前級(Baker.Steven) .  |
Baker.Steven 正式會員 203.xxx.xxx.196 |
2024-10-29 11:22 |
| [#9] 5687牛輸出前級(Baker.Steven) .  |
Baker.Steven 正式會員 203.xxx.xxx.196 |
2024-10-29 11:22 |
| [#10] 5687牛輸出前級(Baker.Steven) 網友部EML-300Bxls後級，亦都同時升级，換上同廠Amorph芯輸出牛!  |
Baker.Steven 正式會員 203.xxx.xxx.196 |
2024-10-29 11:30 |
| [#11] 5687牛輸出前級(Baker.Steven) 正....! 高手~ |
jcyc348 正式會員 202.xxx.xxx.114 |
2024-10-31 13:16 |
| [#12] 5687牛輸出前級(Baker.Steven) 刚刚睇到呢個post，想問吓制作概念 1. 請問綠色訊號線係乜型號？旁邊对喇叭乜型號？ 2. 用5687 接4:1前級牛只得3至4倍gain, 點解唔用你之前隻EC8010 可以出正常gain 3. 300B 或300B 变種胆，用兩級common cathode 6SN7其實已經夠哂gain做合併機，可以用passive volume 令訊號純度更高，請問加多部前級声音是否有其他变化而透明度及純度也有变化 最後修改時間: 2024-10-31 15:53:36 |
niceday009 正式會員 59.xxx.xxx.45 |
2024-10-31 15:37 |
| [#13] 5687牛輸出前級(Baker.Steven) ＞＞次級並1K電阻 隻Monolith 牛次級如果唔並1k电阻係得唔得，抑或佢指定要电阻termination(有D牛overshoot )，唔並loadline係打横失真更低 如果唔一定要並电阻，5687係在A1工作佢只係需要望到足夠初次电感，幾K:幾K其實係冇意義，唔並次級电阻等於隻5687在constant current 工作而load 係極高阻抗綫性更高 最後修改時間: 2024-10-31 16:18:35 |
niceday009 正式會員 59.xxx.xxx.45 |
2024-10-31 16:01 |
| [#14] 5687牛輸出前級(Baker.Steven) Hi Mr. Steven Baker, I tried to guess what the schematic could be for your new 5687 line amp. I worked out the following schematic. Most likely it is different from yours. Johnny  |
johnnykmtang 會員 70.xxx.xxx.22 |
2024-10-31 21:26 |
| [#15] 5687牛輸出前級(Baker.Steven) 1K termination in transformer secondary may cause the loadline to be significantly tilt, 5687 not beneficial to have constant current load If there is no overshoot ringing in 10kHz square wave, I would say. to leave the secondary not terminated In case obvious overshoot is detected, put in place the snubber network , 330p in series of R, it reduces the burden of secondary load (1K is heavy)and make loadline horizontal, Lundahl always recommend sunbber network 最後修改時間: 2024-10-31 23:12:09 |
niceday009 正式會員 182.xxx.xxx.113 |
2024-10-31 22:45 |
| [#16] 5687牛輸出前級(Baker.Steven) #14 Johnny 兄，請問您模擬後結果？1K用與唔用，性能分别如何？另外小弟只以用半支5687，工作設定與附圖一樣! |
Baker.Steven 正式會員 203.xxx.xxx.196 |
2024-11-01 10:12 |
| [#17] 5687牛輸出前級(Baker.Steven) Hello Steven Baker, Good to hear from you. I experimented number of interstage, line output and input transformers. I realized that having a low impedance resistor as load would cause a bit higher in distortion and less dynamic. The sound image opens up a lot without the resistor. However usually there's a high frequency response at around 20~30KHz which can be damped with use of an RC network. What model of the Monolith Line output transformer you are using? The 20mA one? Johnny |
johnnykmtang 會員 70.xxx.xxx.22 |
2024-11-01 10:27 |
| [#18] 5687牛輸出前級(Baker.Steven) I upgraded my parallel 6DJ8 - Monolith amorphous SLA-02 20mA line ouptut transformer configured 2:1, with 5842Q tube. B+ 120Vdc, idle current of 10mA. I notice 5842Q (417A) tube is more linear than 6DJ8 and with even higher gain. Real cool. Johnny 最後修改時間: 2024-11-01 10:41:10 |
johnnykmtang 會員 70.xxx.xxx.22 |
2024-11-01 10:39 |
| [#19] 5687牛輸出前級(Baker.Steven) Johnny 兄，小弟用SLX-01/20，另外想知道您是否用cathode CCS？ |
Baker.Steven 正式會員 203.xxx.xxx.196 |
2024-11-01 12:05 |
| [#20] 5687牛輸出前級(Baker.Steven) Hi Steven, I use the simple transistor "shunt regulator" to provide the cathode voltage for bias of the tube.  |
johnnykmtang 會員 70.xxx.xxx.22 |
2024-11-01 16:36 |
