Hello HaHa,

Here's the schematic I provided my friend to build recently. He really like it. It is very simple one, right. However, it does sound so good.

Johnny

last晚上繼續去作初學者探討研究

充分享定我目前需要前給我一些

計劃做一步前級，幾個鐘頭後繼續探討研究


Haha



最後修改時間: 2025-07-02 15:38:42

＞＞Nano 不是低頻更加容易磁飽和?
Nano 對比其它鉄芯，除了貴之外，還有什麼特點？

Nano導磁率高於冷軋矽鋼片，但磁通量只有冷軋矽鋼片7，8成，用係交連牛好合適因為845推至A2所需只是一瓦左右，將隻interstage 做大兩倍体積可以突發大訊號交連時在較linear region，今次是改變綫組分佈令漏电感更低

#5087

＞＞
用第Nano Crystalline double C core 磁芯繞了第七版interstage, 瞬变和解像比之前幾版都要好，Interstage对声音分別可謂相當大, 第七版已完全拋離Lundal1677，Jazz at the pwanshop套Drum SET


1 突發性動態比較部Balanced Audio Technology VK75se仲快速，

2 高頻空氣感更散射如超微粒般，推对JBL Array 1400會以為係部過百watt胆機推動＞＞

做到這兩點證明D牛好得。動態大，粒子細。

Nano 不是低頻更加容易磁飽和?
Nano 對比其它鉄芯，除了貴之外，還有什麼特點？

最後修改時間: 2025-07-02 08:05:01

niceday master

Am listening

第一步開頭就要諗清楚

真係有趣

My 2 cents

如果準備自己用心砌部靚聲單端胆機，既然花心血及時間做就做部最好

我自己已經有一部parallel 12AY7 direct couple →6CA7 triode strapped interstage → 單隻300B →Sowter SE08 OPT, 呢部機已挑戰過好多貴價歐美日廠機，但我一直想做部PSE 或TSE 300B

初步排位想法如下，其實簡單過845好多好多，隻3x 300B 輸出牛只需要8亨就夠，當然要夠重量，Double C Core 7.7kG會效果好好, 出到30W RMS相當夠用

最後有D人問我點解唔做前後級，我經驗係單端机放哂入一個靓殼可以盡量做到全直結，兼整體訊號傳送係超短，而30W係SET嚟講已經係大功率一般係夠用有凸，合併機在單端世界若果設計得宜，好處比壞處多



最後修改時間: 2025-07-02 02:54:32

A DHT SE diy 101
(有可能要開一個由幾位導師指導教學post,避免這些低級問題污染了here haha)

每天花1/2小時 學習，實踐，有興趣的玩具
意真係開心，還有經驗人士指導
Haha

Info from here

https://www.diy-audio-guide.com/direct-heated-triodes.html



最後修改時間: 2025-07-02 02:30:40

A DHT SE diy 101

Haha
From here
https://www.diy-audio-guide.com/direct-heated-triodes.html



最後修改時間: 2025-07-02 02:26:14

Am learning from all of you

Why I mentioned El84 , because I have a few

Also having some 6l6 too


However nothing to stop me to get some 300b or 2A3 and seem make sense to start from an easy DHT design

As long as such circuit are beginner level , and effort to be paid by not horrible sound quality etc


Thx you feeling exiting for such start


1 Of the first thing to learn

1)對於單端運作的功率tube，要懂得分別DHT / IDHT 兩大主要類別

最後修改時間: 2025-07-02 02:18:50

IDHT tubes like EL84, EL34, 6L6 etc. has high distortion and low output power in Single-ended mode.

Most of these SE amps employs NFB to lower the distortion.

The Chinese made DHT tubes like 2A3 and 300B are with very reasonable price and decent quality. DHT is the way to go for DIYer's.

Johnny

#5093

我冇乜留意旁熱功率胆，原先此EL84係接3極但回輸返第二級SRPP, 請問咁樣個gain係咪好大，失真是否好明顯？



最後修改時間: 2025-07-02 01:24:06

多謝兩位提供一個好的起點

夠我玩一年半載一定好過癮

今晚就開始背景學習

thx you thx you


希望過程之中我由多年嘅唔知亂解

進步到去一次半解

哈哈

最後修改時間: 2025-07-02 01:05:50

Haha 兄：你可以search下 AN p1se & p2se, 我當時考慮裝這線路睇资料寫zero feedback、自己半桶水网上查線路圖沒睇清楚、買晒料砌下砌下先見到輸出牛環路接去輸入级、結果我無接還路、用示波器睇35hz以上算正常、35hz以下亂跳、目前都ok、有力水、高中都唔錯自覺得對得住價值.

Haha兄你仲有部Audionote Meishu, 冇理由砌部旁熱胆EL84單端有回輸去downgrade, SET最靚係DHT with zero feedback

普通發燒友去砌高品質845單端機我承認會有高難度，Finalize 部Ultimate 845後，我會諗部每声道3隻300B出30W之合併機，我係將Octave 部Jubilee 300B為假想歒，Octave Jubilee 300B市場賣67000欧羅，其實我睇唔到佢點解可以賣咁貴

300B推動級比較845易做3至4倍，300B有75V Peak就夠，845要240V Peak才可以推到隻845去到極點

而單隻300B輸出牛有18至24亨已經好足夠, 但單隻845輸出牛起碼要50亨至80亨係300B三倍

部3x300B 將會係3 stage amp, 全直結，有成30W RMS 可以推大部份現代喇叭，到時會share schematic 同埋機壳排位



最後修改時間: 2025-07-02 00:42:06

ck hing

6l6, and 84 can sound quite different, as I learnt from guitar amp ,and I always enjoy the single end El84, the bass and the high frequency feeling


May be more than me wanting to start something easy , and not too costly

Happy to share more ?

6L6 parallel single end
另有 el84 相同線路

有冇一啲用平價膽such as El84 single end or parallel single end 適合初哥做嚟玩下嘅線路可供參考呢

Haha thxxxx thxxxx

Prototype 2

好耐冇update呢個forum, 最近焊咗第二版Ultimate 845 prototype

線路總共試咗新款三個線路，各有優點，但當然係由頭到尾都係冇任何負回輸

用第Nano Crystalline double C core 磁芯繞了第七版interstage, 瞬变和解像比之前幾版都要好，Interstage对声音分別可謂相當大, 第七版已完全拋離Lundal1677，Jazz at the pwanshop套Drum SET 突發性動態比較部Balanced Audio Technology VK75se仲快速，高頻空氣感更散射如超微粒般，推对JBL Array 1400會以為係部過百watt胆機推動

最後修改時間: 2025-07-01 23:14:58