- #390 [CodyChan], 23-11-25 16:55
- #389 [Welborne], 23-11-25 12:17#388
唔好太快,Niceday師兄講緊嘅優點唔係因為c core而係關於C core嘅物料( amorphous or permalloy) ,如果唔係嘅話根據佢嘅說法你嘅得益只係輕咗重量
意思即係c core 不等於 amorphous or permalloy core material
最後修改時間: 2023-11-25 12:18:59 - #388 [CodyChan], 23-11-25 12:12#387.
Thanks Niceday009 bro!
I will order one C Core to replace my EI chock have a try. -
- #387 [niceday009], 23-11-23 23:40C core works as smooth choke is about the same as EI, for the same inductance and current rating. C core may be 10% lighter in weight
C core work as SE output transformer can decrease certain distortion such as eddy current
The importance of smoothing choke would better make use of high permeability iron (higher flux), Amorphous core is the best choice while permalloy is easy to become saturated for choke. The main purpose of Amorphous core is for choke application and higher freq power transformer
最後修改時間: 2023-11-23 23:46:49 - #386 [CodyChan], 23-11-23 16:39Congratulation Welborne bro, 10Y is really really good sound!!!
Hope you enjoy it.
Other question is ... any bro knows choke making by EI or by Cut-core is better?
Or what difference between choke made by EI or Cut core? - #385 [Welborne], 23-11-21 16:35原來跟機來那對是10y,老花看錯了,不知為何一直想着Vt62
聲音很好很好 - #384 [johnnykmtang], 23-11-19 18:15VT-62 is equivalent to 801A, right?
Seems to me the 801A has different characteristics than the 10Y. The filament voltage is same 7.5V 1.25A and pin outs are same. Surely, the bias voltage different between 801A and 10Y. Make sure you set the correct bias voltage before putting the 10Y in circuit.
The normal idle current of 10Y is 45mA according to the datasheet. The cathode voltage with 4.7K and 2.2K in parallel would be 67.5V. The bias voltage with 45mA should be greater than -135V. If the B+ is 440V, the voltage across the plate and cathode would be 440-67.5 = 372.5V which exceeds the max voltage for 10Y.
I believe you must know the details before putting on the 10Y tube.
Johnny - #383 [Welborne], 23-11-19 17:45放大有關部份看得清楚啲
- #382 [Welborne], 23-11-19 17:44請教各位大大
我的機器線路如圖,本身跟來是用vt-62,請教這部機器,如果插vt-25 or 10y or UX-210等嘅館,根據這部機的設計,安全嗎?
先謝 - #381 [CodyChan], 23-09-13 13:50星期六有空把買了一段時間的雙C牛換上部VT-25 到, 剛剛開聲時有點悶, 開機一小時後撥開雲霧見青天!
聲音明顯比EI牛低音和高音都有大幅度改善. 花了數小時是絕對值得!
喇叭是 Vela BS403第一代. - #380 [tvbbb], 23-02-25 14:37燈絲採用三種不同的供電方式,
7.0V/20HZ / 再生電源!
7.3V/60HZ / 市電!
7.0VDC / 穩壓直流!
兩位網兄試聽後選擇 7.0V/20HZ / 再生電源 供電,
原因是聲音卡有力(飽滿),與市電供電相比無哼聲,與直流相比〝肉感與活生感〞好! - #379 [tvbbb], 23-02-25 13:43簡單描述:
45細膩很多,較接近71A
2A3<旺聲>,比<站起來的6AS7大和艦>還要旺聲。
made in China 的Valve Art or RCA new old stock twin plates 2A 3 聽起來都有同感。
好比DIY的耳機, 45接近417A 耳機的乾淨俐落 感覺,而 2A 3 較接近 5687耳機 開闊低沈。
無信號時,哼聲45很少,2A3有一點,串連51 Ohm後,45哼聲已無問題,2A3哼聲還可忍受。 - #378 [tvbbb], 23-02-25 13:40當屏壓Ep=250V, 偏壓Eg=-50 V時,2A3屏流較大。因此設計屏壓250V, 可以45、 2A 3隨插隨用。
但是真正要發揮屏耗45=10W, 2A 3=15W,廠家建議工作點是45的屏壓/屏流=275 V/36 mA, 2A 3是250 V/60 Ma 。 - #377 [Welborne], 23-02-16 22:14two of my fav tubes: 01a and 71a
- #376 [Welborne], 23-02-16 22:13
- #375 [Welborne], 23-02-13 19:43我在二手區徵求中
- #374 [tvbbb], 22-06-28 22:23換走了tango for 300B 的電源牛,換上MS-160 電源
- #373 [tvbbb], 22-06-28 10:09係日本買部DIY 機,用DHL 寄過嚟都成部野凹咗,在日本拍照時完成無事,檢查完,焊番D斷腳的零件,D聲得過响字,gain 太大,不如從新扭番正個殼再黎過
- #372 [CodyChan], 21-09-02 10:27#371.
Welborne 師兄識貨!
希望你早日試到10Y / VT25 把聲啦! - #371 [Welborne], 21-08-17 17:10https://m.review33.com/forum_msg.php?db=5&pagerec=25&v=2.1.5.1&topic=17210817152002&sort=0
徵求任何使用vt25/10y的單端功放,製作良好的日本人diy機也不拘。please pm
最後修改時間: 2021-08-17 17:11:09 - 下一頁 (1 of 20)
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No worry just for update my knowledge.
Actually, I'm order from 淘寶 there is no big deal.