- #159 [美好日子], 25-05-17 11:55而家 d 後生仔唔係咁多識 DIY hi fi, 掛住搵食, 時代唔同啦
- #158 [美好日子], 25-05-17 10:03
- #157 [美好日子], 25-05-17 09:54曾玩過綿光買的 Mullard OC72, 當年三個半一粒, 亦等如 Mullard ECC83 價錢, 係講緊六十幾年前的事。亦於佐敦倫敦戲院鄰英光地鋪買過套件, 小黑豆 SE4010 低雜音前級黎銲, 及小老虎後級, ....那時吳松街華輝亦有套件賣, 聽講, 那肥佬老細同鴨記有關連的。 見圖那 CK722 , 勾起回憶, 那時萬里出的一本原子粒制作, 都大量用 CK722. 通街去買, 又買唔到, 今日有幸見真身。
最後修改時間: 2025-05-17 10:00:01 -
- #156 [cft], 25-05-12 16:13
- #155 [cft], 25-05-12 16:09很多舊款嘅日本半導體零件 (60年代起) 喺呢個網站仲可以見到有圖同買到。
(見到已清理左d,以前很全面吓)
https://wakamatsu.b旦iz/#cha
最後修改時間: 2025-05-12 16:22:18 - #154 [WilliamsonAudio], 25-05-12 08:11如果有“電聲界”下載就好。我只有5本。
- #153 [高原], 25-05-10 23:15個人所知RET/EBT等類型輸出管,高頻特性相對一般優勝,所以日本規格歸納
為RF系列,PNP編號以2SA及NPN是2SC開頭。 - #152 [.ghost], 25-05-10 21:21#148
我都有幾件當 70s DIY 剩餘 POWER RET .它的聲音很有感染力。現在只能留作記念物
- #151 [thomasc2], 25-05-10 10:37#144 #145
已寄出request兩日但仍未見有任何動靜,唔知有冇師兄download左可以私下直接分享。
非常感激! - #150 [CodyChan], 25-05-09 11:05#146
等了一天, Mao Lin 老師給我權限 可以下載了.
總共 3.21GB !
有排睇! - #149 [info2k], 25-05-09 01:03七十年代後期,日系半導體廠商爭相開發,大功率高 fT 音響輸出管,其中以
富士通(RET)、NEC(EBT)及三肯(LAPT)較流行,而東芝/新力/松下亦有推出同
類元件,那些年多重視技術功能參數,而音效上 V-FET 最受注目及好評。
https://iruchan.seesaa.net/article/2015-08-02-1.html
https://www.diyaudio.com/community/threads/bipolar-bjt-transistor-families-for-audio-power-output-stages.147656/
最後修改時間: 2025-05-09 01:12:24 - #148 [cft], 25-05-08 21:34用RET (Ring emitter transistor) 做output的kit出左喇!!

- #147 [cft], 25-05-08 21:32台灣的英光電藝社

- #146 [cft], 25-05-08 21:26要approve咗先可以download, 你click咗嗰條FB link跟住就會叫你send個request畀佢㗎。 再唔係呢可以喺facebook send個message畀佢..
試下send個email畀佢chipware.linsm@gmail.com問啦我有個朋友問咗佢跟住就approve咗喇.. - #145 [CodyChan], 25-05-08 14:51#144.
請問師兄是否要會員才能 download?
- #144 [cft], 25-05-04 14:58台灣《音響技術》雜誌 1976至85年 free download。要快手,link至5月尾..
好似平衡宇宙, 似曾相識像睇返以前香港的《電聲界》。
https://www.facebook.com/groups/298127294542691/permalink/1393997961622280/?mibextid=rS40aB7S9Ucbxw6v
最後修改時間: 2025-05-04 15:02:50 - #143 [cft], 24-12-19 14:10*世界第一粒 opamp µA702 60歲lu!! 有冇用過呀, 可能第一隻用係 µA709, or µA741??* 網上面已經搵唔到佢地黑豆嗰個package lu....
Fairchild µA702 運算放大器由製程工程師 Dave Talbert 和設計師 Robert Widlar(照片)團隊於 1964 年創造,是第一個廣泛使用的opamp商業產品。
他們 1965 年的繼任者 µA709 建立了模擬 IC 的大眾市場。
然後在 1968 年,Fairchild 的 Dave Fullagar 透過添加內部補償電容器對 LM101 進行了升級,推出了 µA741,這是有史以來最受歡迎的運算放大器。
- #142 [johnnykmtang], 24-12-07 03:04That means :- SIMPLE is the very best.
- #141 [johnnykmtang], 24-12-06 21:57THD (Total Harmonic Distortion) measurement using a single pure sine wave tone has been the industrial standard for many decades. The THD spec provide us a general idea how the amplifier performs. Lower the THD figure, the better sound it should be. Unfortunately, this is not the case.
As mentioned in the John Curl's article, the most problematic would be those high order harmonics due to distortion generated within the amplifier circuit. Every stage in an amplifier would produce some distortion that generates some harmonics. It is easy to understand that more stages the amplifier has, much more harmonics it would produce. Therefore, a very simple two stage tube amplifier should sound the best because it would have much less harmonics.
On the other hand, we need to make sure each stage shall be designed with minimal distortion to avoid excessive harmonics in numbers and magnitude.
Johnny - #140 [cft], 24-12-06 21:08有心人整理了John Curl 多年來的 amps design 心得。
pdf download:
https://www.diyaudio.com/community/attachments/johncurl-v-0-1-pdf.1387258/
John Curl 156 頁 (1999) Audio amplifiers, everything on parts, designs, and history, etc, 30年心得, 勁呀!!
最後修改時間: 2024-12-06 21:18:05 - 下一頁 (3 of 10)
- 返回 ...

