#19.
剛剛睇咗 Lundahl OPT list, 好似無隻有 4ohm 同 8ohm共存的牛
是否根本無嘅定係我睇漏咗？
我想搵隻 for 45 SE 的，最好有 4 or 8ohm 輸出選擇。

#22

＞＞The OPT windings are fully used without idling like the traditional ones.

Lundahl這一種設計應該係。4 個 1Ω的次級，串和並來設定輸出阻抗4Ω 或 8Ω。 如果要改變阻抗。,又要重新接過。因為所有次級沒有空接。Johnny 就係欣賞佢這一點。

Partridge , Sowter,Jadis 都是這樣做。



最後修改時間: 2024-11-17 00:38:35

https://radaraudioshop.com/zh/products/mira-ceti-single-ended-class-a-300b-tube-integrated-amplifier

各位師兄，可否比啲意見

＞＞串和並來設定輸出阻抗4Ω 或 8Ω。 如果要改變阻抗

呢種做法有個大優點: 1st and 2nd winding Fully coupled

#22，25.
Thanks Willian & niceday bro!
咁就真係要睇清楚先得，我 以為好簡單一換一就得，原來都要花些功夫嘅！
謝謝二位師兄，我試下睇下youtube啲師兄點搞先，始終小弟都唔係有錢人，
買一對都要計算清楚，以免買錯或者買咗之後原來搞唔到就幣加火。

#24.
"單端胆機同好會" 多位大師都答咗.
簡單講部機除咗玩換膽, 根本無任何升級空間, 所以我都覺得唔值得買.

慢慢揀!!!
https://www.lundahltransformers.com/wp-content/uploads/datasheets/Tube%20output%20transformer%20selection%20list.pdf

Hi CodyChan,

The table is rather difficult to read. The following is easier one.

https://www.lundahltransformers.com/tube-output/

I would suggest you may take a look at the LL2766 30mA. Low cost, small size.
https://www.lundahltransformers.com/wp-content/uploads/datasheets/2766.pdf

The EleKit upgrade their SE amp with Lundahl OPT too.

Johnny

I remember there's a store at ApLiu Street years ago carries the Lundahl transformers. Unfortunately, the shop was closed some years ago.

#29.
Many thanks for Johnny bro info!
Are you using LL2766 on your 45 SE amp? If so how is the sound?
I found the standard version is selling €124.56, AM version is +€124.98,
almost double the price! Is it worth to pay €124.98 more to get AM version?

Hi Cody,

Get the standard LL2766. It should be good enough. I don't think it is worth to invest too much like I did.

You may contact Lundahl if they can sell it direct to you or through their distributor somewhere.

Johnny

#32.
Got it!
Thanks Johnny again.

以前玩Lundahl 輸出牛，非晶高頻通透好多空氣感多好多

低頻冇咁厚

普通版本低頻雖然厚，但係會帶着混濁粗糙感，我估應該係Barkhausen noise

如果我而家再砌機，我估我都仍然會選擇Amorphous core

另外心思思好想試試 Lundahl 純銀牛，但係一定要搞清楚線路同埋聲音係咪自己最喜愛，即係用普通版本火牛先，真係好啱先upgrade做純銀

話時話，我原本想買對二手 Lundahl 牛試下先嘅，點知原來市場上極小二手放售嘅！
所以只好買全新！

#34

我用Amorphous 及Hi B 材質分別做interstage, 非晶快速及細節好但厚度沒有Hi B厚，Barkhausen effect相信兩種芯都有，估計係coercivity force参數之大分別造成，Amorphous coercivity 低過Silicon Steel 10倍以上

依家用Nano Crystalline 但未試声而測試性能已經比兩款都更好，預期可到best of both worlds

但銀綫牛本人覺得只係賣卓頭，而且貴到冇譜



最後修改時間: 2024-11-18 20:40:30

Re-#10
用耳筒聽好好聲，請問師兄唱片名稱，謝！

如果我冇記錯，應該係已經執咗嗰間本地錄音TIS 嘅其中一隻CD，好似叫做 Sound of Sax

Timbre of Sax才對

原來依家買Lundahl 牛有這東西送的!

Hi Cody,

Have you bought the Lundahl OPT?

Johnny