- #4080 [niceday009], 24-05-17 19:15
- #4079 [niceday009], 24-05-17 19:07修改再post
最後修改時間: 2024-05-17 19:16:51 - #4078 [niceday009], 24-05-17 13:38最新progress, 調整了ECC99 直結operating point, 現時845在78W 靜態屏耗下出26W A1 以及45W A2, 已達到預期功率
呢部Ultimate 845預期要sonically outperform Cary CAD805RS mono block -
- #4077 [niceday009], 24-05-17 13:30好彩琴晚我一時興起按制購入時,佢話唔送貨去香港地域,都係揸住对JBL Array 1400算,反正我用845夠哂力
- #4076 [johnnykmtang], 24-05-17 04:15I still in favor of the good old Prestige Tannoy's.
Johnny - #4075 [Welborne], 24-05-17 02:23係呀,我都未見過有兩粒星嘅what Hifi Review :)
- #4074 [hahayanyan], 24-05-17 01:27嘩要 whathifi 攞到兩粒星 真係好少見
係一啲relatively 低預算嘅hi-fi. Their best buy 真係好信得過嘅
最後修改時間: 2024-05-17 01:28:41 - #4073 [Welborne], 24-05-17 01:21
- #4072 [niceday009], 24-05-16 23:39仲有一款係全音單元,單端机度身訂做
- #4071 [niceday009], 24-05-16 23:30Heco Direkt 2 way 大特價,萬三港元一对好抵
心血來潮..... - #4070 [niceday009], 24-05-16 16:36#4068
有些標94dB SPL 喇叭,例如JBL 4343B, 4路分音消耗好多功率,4343B最少用50W 胆机至推得好
反觀Audionote 二路分音2nd order 95dB可以真正高效率,用單枝300B打鼓都似模似樣(當然唔係超大声),但Audionote 喇叭必須靠牆放才平衡,自由空間冇乜低音
最後修改時間: 2024-05-16 16:42:23 - #4069 [Welborne], 24-05-16 15:00利申:我喜歡高效率喇叭,但高效率的大多有一些強烈個性,喜歡的人很喜歡(像我),但並不是大路不是很多發燒在發燒路上成長大部份歲月會接觸到的聲音,所以從市場角度看屬於少眾產品。
- #4068 [Welborne], 24-05-16 14:19靈敏度係幾高,但可能唔好聲呱,好聲音同高靈敏度並不永遠存在,又好聲又高靈敏度嘅喇叭可遇不可求
- #4067 [niceday009], 24-05-16 13:36原來HECO仲有对二路低音11吋,95dB SPL 只賣3100 USD, 個樣似足ANE
又係用單端300B推, 好明顯HECO呢糸列係比細Watt 胆机用
点解香港冇代理?香港人好多用SET
最後修改時間: 2024-05-16 13:43:09 - #4066 [niceday009], 24-05-16 12:52HECO 出咗对喇叭用15对低音,中音及低音都係用紙膜,外型形狀似Audionote ANE,一樣係扁身箱以及超闊箱身,我估扁身箱可令到低音單元震幅時空氣粒子撞擊箱身更有效率從而整個音箱面積用作低頻共鳴更容易,以及超低响應更有效率
HECO這喇叭有98dB靈敏度,除Audionote 之外,好少非horn喇叭可以達到98 dB SPL, 相信同喇叭箱形狀及紙膜震膜有關
HECO 做喇叭做咗60年,相信佢呢对喇叭研究咗好耐,買喇叭寧願買老牌大廠出品,HECO 係其中之一
Single ended triode 恩物,图片中用300B推
真係好想聽吓佢
最後修改時間: 2024-05-16 13:10:30 - #4065 [niceday009], 24-05-15 23:08
- #4064 [niceday009], 24-05-15 22:42但係有樣嘢覺得Audionote哲學有contradictory
Audionote 完全冇用CCS或其他mechanism 去減低失真,佢2nd harmonic 及thrid harmonic 應該好大,Audionote 低音龐大同声底厚係必然(這些都是2nd harmonic 善意失真的特徵),但大量2nd harmonic 會mask out 一D音樂微細訊號,用過Audionote level3以上胆机個個都知Audionote 對於 subtle music signal 並非分析力好好
但Audionote 又會話佢用更高鎳成份合金將細微信號更明顯,???,D細微信號已經比2nd harmonic 蓋過,仲点樣恢復?
Wilson听過好多Audionote 頂班器材,点睇Audionote 弱音分析力
最後修改時間: 2024-05-15 22:57:41 - #4063 [niceday009], 24-05-15 22:26
我並非Audionote 信徒,但睇嚟Audionote 都幾深入民心
美國音响評論人OCD HI FI, Mickey, 係Florida Audio Expo見到Peter Qvortrup, 比Peter 套展覽組合之動態嚇親,要知道Ongaku 得20W左右,睇下Mickey 點講
最後修改時間: 2024-05-15 22:32:03 - #4062 [niceday009], 24-05-15 22:20>>Even using parallel 6SL7 will provide sufficient drive voltage and extended high frequency bandwidth for the 300B.
Very true indeed, Cary only use single section 6SL7 to drive 300B, 6SL7 plate resistance is 40K
I once bought Cary CAD300B, push pull amp, 6SL7 single section drive 300B
最後修改時間: 2024-05-15 22:30:35 - #4061 [johnnykmtang], 24-05-15 21:28I have tried two types of LinLai 300B tubes for some time with shunt regulator at the cathode, i.e., fixed voltage at cathode. I biased it 70mA with 420V B+. The anode-cathode voltage is approx 350V.
Once the 300B tube got warmed up for about 30mins, the idle current start drifting higher. I had to reduce the idle current to 60mA which will be stable over long operating time.
The same happens to the EH and the Russian Gold Lion 300B tubes as well. I don't have the WE ones for testing. With use of RC cathode bias won't have such issue but we need to watch out when using fixed bias.
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845 ultimate single 屏压為1100V, bias -195V
我現在300B drive 到845 栅电162V AC RMS 等於230V Peak AC, 超出195V偏压, 出到45W 肯定是包含A1及A2功率,等於比-195V drive多35V 正栅电压,但情形同之前Chinglan 師兄有些少分別,現在drive 到+35V此時845 栅流只不過係2.42mA, 3mA都唔夠, 此時等於約1W 功率唔夠已經可以drive 多35V正栅压達到45W output,當然再推多上去栅阻抗就再跌可能達至845 A2 出60W 極限(Jack Eillano 曾經揸盡隻845出60W A2)
更加加強我对於interstage判斷, 就算要drive A2, 寧願選擇高導磁物料多過高磁通飽和磁芯,功率傳送真係唔多,interstage 次級都好多圈基本上寄生电容比output牛更難搞,用high relative permeability 磁芯可以更有效
最後修改時間: 2024-05-17 19:23:28