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| [#61] 用直熱管DHT前級的朋友請進 Tube Compliment: 2-12AU7 2-300B 最後修改時間: 2018-09-18 11:33:20 |
bambino 正式會員59.xxx.xxx.45 |
2018-09-18 11:33 | |
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| [#62] 用直熱管DHT前級的朋友請進 https://www.review33.com/avforum/index.php?topic=92080522211322&post=20#message_reply 以前D高手去左邊。 在裏面学到野。。 Ck2007.. 前post 的preamp 電源牛巳瓜左好耐末整返。大陸xifu 砌的。小学level soldering..連fuse 都沒有用。(瓜左开蓋才見到上述horror scene)。在 之前post的 link 有講。 |
pluto2 正式會員 45.xxx.xxx.241 |
2018-09-18 11:53 |
| [#63] 用直熱管DHT前級的朋友請進 如有興趣,找個星期六攪個gathering飲茶聚聚，交流一下 : )) 最好有埋家訪，精彩了! 最後修改時間: 2018-09-18 12:43:04 |
an8m4 正式會員 221.xxx.xxx.189 |
2018-09-18 12:41 |
| [#64] 用直熱管DHT前級的朋友請進 自問DIY都係為咗負擔到得出成品, 沒有能力研究人家線路好壞, 最好有人試過推薦吾洗行冤枉路. 睇落DHT難度避免hum聲, 選擇低噪供電線路最緊要. K&K audio有組合用4P1L, 好似幾實際, 有師兄提過coleman regulator. 請高手比D意見.  |
ck2007 正式會員 223.xxx.xxx.244 |
2018-09-18 13:34 |
| [#65] 用直熱管DHT前級的朋友請進 For my 2 cents experience, Coleman regulator VS Filament Choke LCL Filter Noise(Hum) - Coleman Regulator Better than LCL but LCLCL can be same noise level as Coleman Regulator. Sound Quality - LCL or LCLCL is win a lot! Money - Coleman Regulator cheaper too much |
n19137 正式會員 61.xxx.xxx.190 |
2018-09-18 16:27 |
| [#66] 用直熱管DHT前級的朋友請進 LCLCL Fliament filter  |
n19137 正式會員 61.xxx.xxx.190 |
2018-09-18 16:32 |
| [#67] 用直熱管DHT前級的朋友請進 http://www.bartola.co.uk/valves/2017/08/14/uv-201a-dht-preamp-revisited/ Ale Bartola 的線路現今最hot gah lah. :) 要简单D，其實不用gyrator (即電子choke), 連coleman reg 也不需要lah..如下圖. :) 1) 用3.3v 電池。包無hum! :) LiFeo4 type 最好。 battery tech now greatly enhanced ah.. ** sorry, battery should be in direct connection to filament, not via 47 ohms..** 2) 用01A, 不用考慮其它胆 3) B+ 百多廾百volt，up to you 4) 33k 1W .. play with 22k to 33k 5) 1k, play with it too..for cathode bias 6) output z is high, thus need hi z input amp (eg, tube amp) Thats all. :)  最後修改時間: 2018-09-18 16:46:13 |
pluto2 正式會員 45.xxx.xxx.241 |
2018-09-18 16:38 |
| [#68] 用直熱管DHT前級的朋友請進 Yes 01A can be used battery for Filament because it's filament current is only 0.2A. And also 5V battery is easy found. 最後修改時間: 2018-09-18 16:52:17 |
n19137 正式會員 61.xxx.xxx.190 |
2018-09-18 16:49 |
| [#69] 用直熱管DHT前級的朋友請進 #67 容小弟來個狗尾續貂。 3. B電也可用9V rechargeable電池，廿多塊串聯起來便夠，反正耗電應不超過10mA。 6. 加個cathode follower以減低輸出阻抗，用White cathode follower會更好。 |
羅密歐 正式會員 42.xxx.xxx.60 |
2018-09-18 17:07 |
| [#70] 用直熱管DHT前級的朋友請進 agreed with #65 & #69 :) 如果interconnect cable 短及用high input z amp... then as is ..ok.. |
pluto2 正式會員 45.xxx.xxx.241 |
2018-09-18 17:12 |
| [#71] 用直熱管DHT前級的朋友請進 #65 Noise(Hum) - Coleman Regulator Better than LCL but LCLCL can be same noise level as Coleman Regulator. Sound Quality - LCL or LCLCL is win a lot! ------------------------------ n19137 hing, what's the total H & uF in LCLCL to achieve the same noise level as Coleman Regulator? i like passive filters (LCL or LCLCL) too. |
bambino 正式會員 123.xxx.xxx.222 |
2018-09-18 19:55 |
| [#72] 用直熱管DHT前級的朋友請進 用電池點燈絲最好能配合一個可較的自動充電線路,唔知c hings 有冇好介紹.我以前買落一堆26,十幾年來一直都想搵2V的鹽酸電池但都搵唔個到. |
thomasc2 正式會員 218.xxx.xxx.148 |
2018-09-19 10:38 |
| [#73] 用直熱管DHT前級的朋友請進 bambino hing the capacitor is better to use bigger than 22000uf in each Cap. I 'm using 47000uf. Choke - that is depended on how many chokes are using in your passive filter. LCL - at least 100mH for each choke. LCLCL - you can use 25mH or above for each choke. |
n19137 正式會員 61.xxx.xxx.190 |
2018-09-19 10:41 |
| [#74] 用直熱管DHT前級的朋友請進 #72 Hi Thomas C-Hing, Is that possible to use regulator to drop down the Filament supply Voltage? ie. Couple of 18650 batteries parallel ＞ LT-1805 ＞DHT Filament. 最後修改時間: 2018-09-19 11:14:54 |
baker.steven 正式會員 165.xxx.xxx.116 |
2018-09-19 11:14 |
| [#75] 用直熱管DHT前級的朋友請進 LT-1085 or alike is something to avoid with (unless being used as a ccs)...its output z is similar to the filament resistance, the problem is signal also goes through the filament in a dht...in this case highly likely that some noise will get injected or signal gets robbed out from going in and out of the 3 terminal device..thus non linearity will be introduced, hence, the need of coleman regulator for the rescue... I discussed this effect and others in my thread on 1PK previously. (see link posted earlier) LiFeO4 battery is the choice... just need to find a way to do it...or some Lithium based 1.5v... 最後修改時間: 2018-09-19 11:48:56 |
pluto2 正式會員 45.xxx.xxx.241 |
2018-09-19 11:34 |
| [#76] 用直熱管DHT前級的朋友請進 Thank you for bringing up LT1085, come to think of it...indeed it will be a good solution for LiFe04 3.3V battery based filament powering for 26 tube (and others), to be used as a current source in this case, passing 0.8-1.0A. :) There are also other schemes, like filament bias with say three 3.3V batteries in stack going thru the filament and some cathode elements (R, SiC diodes). 最後修改時間: 2018-09-19 12:48:03 |
pluto2 正式會員 45.xxx.xxx.241 |
2018-09-19 12:32 |
| [#77] 用直熱管DHT前級的朋友請進 一開始又全部都係tech talk，circuits，我就完全沒興趣再看下去了⋯⋯Poor me 最後修改時間: 2018-09-19 15:46:46 |
welborne 正式會員 182.xxx.xxx.205 |
2018-09-19 15:46 |
| [#78] 用直熱管DHT前級的朋友請進 so true... sorry ..haha... Thats pretty much it on the tech part from me... :) I think buying that switchable 01a-26 is a good option. 最後修改時間: 2018-09-19 15:56:09 |
pluto2 正式會員 45.xxx.xxx.241 |
2018-09-19 15:51 |
| [#79] 用直熱管DHT前級的朋友請進 奇怪點解無師兄講27膽嘅? 不知有無師兄砌過27前級呢?  |
CodyChan 會員 203.xxx.xxx.82 |
2018-09-19 16:32 |
| [#80] 用直熱管DHT前級的朋友請進 因樓主起個標題是直熱管前級，但27是傍熱膽呀。 |
n19137 正式會員 45.xxx.xxx.141 |
2018-09-19 16:47 |
