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| [#5783] 單端胆機同好會 Hi Johnny, at this stage, i have no plan to attempt anything in balanced configuration. but i would like to ask you why it's balanced driver & SE output stage? as you know, balanced configuration is designed for transmitting signal over a fairly long distance and reduce noise pick up along the way. for most home users, noise pick-up is not an issue. is it becos you like the sound signature of balanced amplification? and, have no need for higher power output? i personally don't have experience with balanced sound. but it seems Thomas Mayer like it a lot and he actually build 10Y balanced preamp for sale. if you are interested, you might want to have a look at his blog. Cheers |
bambino 正式會員61.xxx.xxx.40 |
2026-05-18 21:51 | |
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| [#5784] 單端胆機同好會 除了SE, Thomas Mayer 也有出過differential PP amplifier http://vinylsavor.blogspot.com/2016/10/the-differential-power-amplifier-part-2.html Differential PP 早年由Allen Wright提出. 最後修改時間: 2026-05-18 22:00:57 |
WilliamsonAudio 正式會員 95.xxx.xxx.15 |
2026-05-18 21:58 |
| [#5785] 單端胆機同好會 The reason why I experimented the balance differential PP driver for 300B SE was because I want to provide purest non-distorted driving signal to the 300B. Then, I could hear the natural sound of the 300B rather than having distorted signal mixing with the 300B. The result was quite impressive which lead me to build the full differential balance 300B PP amp. The conventional audio note and sun audio cascade 6SN7 driver circuit are having approx 3~5% distortion at full output power. This distorted driving signal will further mix with the 300B natural distortion. This will create many more high order of harmonics... Johnny 最後修改時間: 2026-05-18 22:21:42 |
johnnykmtang 會員 88.xxx.xxx.43 |
2026-05-18 22:17 |
| [#5786] 單端胆機同好會 #5781 ＞＞我覺得我的喜好比較接近Thomas Mayer同Sakuma san的理念. Sakuma san 影響了好多人。包括。Thomas Mayer, Thrax 的設計師。 基本上都係。牛 Couple |
WilliamsonAudio 正式會員 18.xxx.xxx.255 |
2026-05-18 22:18 |
| [#5787] 單端胆機同好會 Hi bambino, 26 推 46 推 10Y,這個是全直熱後級設計。 我記得師兄似係用type 10Y前級。 這樣就係全直熱系統。 Thomas Mayer 也是這種設計理念。 全直熱之路，在膽機當中。祇有極少人玩過這樣組合 https://www.monoandstereo.com/all-dht-amplification-by-thomas-mayer/ 最後修改時間: 2026-05-18 22:33:52 |
WilliamsonAudio 正式會員 95.xxx.xxx.15 |
2026-05-18 22:25 |
| [#5788] 單端胆機同好會 Recently I read the details of the Thrax SPARTACUS 300B mono's. The way I understand the circuit is:- Single 300B SE as driver with Interstage Transformer for phase splitter driving 2 pairs of 300B push pull output stage. I believe the concept is having the taste of 300B SE and have it pass onto the parallel push pull to boost the output power of 50 watts. |
johnnykmtang 會員 88.xxx.xxx.43 |
2026-05-18 22:41 |
| [#5789] 單端胆機同好會 #5788 Johnny, fyi Sakuma san built this 300B SE drives 300B PP back in 2013  |
bambino 正式會員 61.xxx.xxx.40 |
2026-05-18 22:47 |
| [#5790] 單端胆機同好會 #5785 i see why you want balanced driver and SE output now. basically you want to keep 300B sonic signature and nothing else. that makes sense. actually i have one more point to make about balanced configuration. as you know, it needs a quad set of tubes in each stage (2 for each channel). if you are a vintage tubes fan like me, you will have trouble sourcing a matched quad set of these tubes. for example, i have 15 pcs of 26 tubes, of which 4 are arcturus blue glass (not matched), 2 pairs of Raytheon box plate (they don't look exactly the same, maybe made in different years). i have 2 pairs but not a quad set. so, it's much easier to find current production tubes, if going the balanced route. 最後修改時間: 2026-05-18 23:01:21 |
bambino 正式會員 61.xxx.xxx.40 |
2026-05-18 23:01 |
| [#5791] 單端胆機同好會 Yes, it is really true that getting match pair of tubes is very difficult especially for those NOS ones. I simply use those new production of LinLai and my friend use the PSVANE 300B match pairs. We don't have any problem using them in our differential push pull stage. I have one differential push pull amp using 6A5G tubes. I could able to find two match pairs can be used. Johnny 最後修改時間: 2026-05-18 23:31:04 |
johnnykmtang 會員 88.xxx.xxx.43 |
2026-05-18 23:30 |
| [#5792] 單端胆機同好會 #5788 Thrax 現在的旗艦後級設計是SE 300B 再300B PP 將SE 和 PP 兩種技術混合應用。 和你其中一臺differential 推300B 理念剛好相反。 最後修改時間: 2026-05-18 23:37:26 |
WilliamsonAudio 正式會員 18.xxx.xxx.154 |
2026-05-18 23:36 |
| [#5793] 單端胆機同好會 Thomas Mayer, 佐久， Thrax 還有一個設計共通點。都是用一功率DHT做driver 推功率DHT 例如45推45 300B 推300B |
WilliamsonAudio 正式會員 18.xxx.xxx.154 |
2026-05-18 23:39 |
| [#5794] 單端胆機同好會 #5787 i built my 10Y preamp in the early stage of DIY hobby, more than 15 years ago. but it never lived up to my expectation in terms of sound quality & noise level. so, it was disassembled. later, i bought a WE102D-＞WE205D preamp from a local WE master (mr Wu). the circuit is fairly similar to WE 8A amp and i like it a lot. it was used until i have built my current amp. 26-＞46-＞10Y is an integrated amp with built-in PSU, in mono design. so i don't need a preamp now. the idea is to take the challenge and put everything in one box (for each channel). keep the signal path the shortest possible. right now, it's a 2nd prototype. 1st prototype is spreading all parts on a table, very convenient to make change (although it looks messy). that's where i did my experiments comparing different loading & coupling. in 2nd prototype (current version), everything is put in a wood cabinet with metal top & bottom plates. once built, it's very difficult & heavy to move it & turn over to make change. but i am still (even today) doing experiment with this prototype. my plan for final version is to convert it to 26/01A-＞10Y-＞300B. 26 & 01A is switchable (i hope i can make it). 10Y becomes driver. current build use 46 driver becos i already have tamura B-5003 IT which is good for 46 loading. 10Y driver will need a different IT with higher impedance. also, 10Y output in current build becos i want to see how powerful it really is for a 1.4W max output. in fact, it sounds at least as powerful as 300B SE output (perhaps due to different input & driver stage in my old 300B amp), but that's my listening perception (not scientific measurement). 最後修改時間: 2026-05-18 23:47:05 |
bambino 正式會員 61.xxx.xxx.40 |
2026-05-18 23:41 |
| [#5795] 單端胆機同好會 hi Johnny, 看過大陸網友的解說和LaLaLam兄的描述我完全明白了,這是火牛輸出並聯(BTL),如果有4倍輸出就一定會選擇這種方式不會用單端並聯方式,因為單端並聯只有兩倍輸出而且音效一向有爭議,是否一定要用兩隻單端輸出牛並聯不可以用一隻推挽牛代替? |
JimmyDIY 正式會員 112.xxx.xxx.146 |
2026-05-19 02:05 |
| [#5796] 單端胆機同好會 hi bambino兄, 我正是考慮用牛交連好還是用Choke Load 直接交連好?因為直覺上一定是Choke Load 直接交連最好的,但看到你的分享我就放心了,因為我買了兩對NC20交連牛(一對老Tango NC20,一對ISO NC20F),可否詳細描述一下為何你覺得用牛交連好過用Choke Load 直接交連?它們的音質表現分別在那裏? |
JimmyDIY 正式會員 112.xxx.xxx.146 |
2026-05-19 02:14 |
| [#5797] 單端胆機同好會 Hi Jimmy, For balance SE BTL, the push pull output transformer (OPT) can't be used in such application. Each SE amp needs individual OPT to work. Then, the two inverted signal is combined by having the two output windings in series. |
johnnykmtang 會員 88.xxx.xxx.43 |
2026-05-19 13:39 |
| [#5798] 單端胆機同好會 hi Johnny, 謝謝回應,問過彈弓楊前輩,他介紹的全平衡單端後級有4隻單端輸出牛的,看圖片牛身非常巨大,如單端方式一支845大約廿幾瓦輸出,但並聯後變成100瓦輸出,請問此種設計輸出牛應該用幾多瓦的才對? |
JimmyDIY 正式會員 112.xxx.xxx.146 |
2026-05-19 14:02 |
| [#5799] 單端胆機同好會 Hi Jimmy, I don't have idea what 彈弓楊前輩 did in that balance SE power amp with 4 pcs of OPT. I think it is a stereo system with two OPT's for one channel. If you want total of 100 watts from four 25 watts channels, they can put all 4 ohm taps in series which forms 16 tap for 16 ohm speaker. I believe you have to ask Mr. Yeung about this specific amplifier. Johnny |
johnnykmtang 會員 88.xxx.xxx.43 |
2026-05-19 14:23 |
| [#5800] 單端胆機同好會 #5796 我喺#5781是咁樣講的 "....相信會有幾多人話4)最好聲,聽完之後我還是選3)......" 我只是話我選擇3) (IT couple), 不是話牛交連好過用Choke Load 直接交連. 講番這次比較我的感想....(大約兩年前的事) ＜choke load, direct couple＞ - 聲音比較直白. 哩點其實已經有人講過. 另一講法是聲音比較中性. 沒有明顯音染. - 音埸大, 亦upfront少少 - 聲音有力 - 夠detailed ＜interstage couple ＞ - 聲音有少少sweetness. 好明顯是跟隻牛有關. - 音樂起落反應快,而且從容 - 聲音一樣咁detailed,跟DC沒有明顯分別 (未比較之前我以為DC會detailed好多) 我個人比較偏好聲音從容,有microdynamic. 聲音少少sweet我完全接受. 但跟IT couple線路冇關. 你可以選擇其他IT,自然有吾同音色. 問題是你分吾分得出乜嘢係來自隻牛,乜嘢係來自線路(即係話你用乜牛,只要隻牛正常,基本上都有類似音色). 呢點吾容易分別出來,但經驗會有幫助. 仲有,direct couple線路吾只一個,砌機難度比IT couple高. 這也可能影響結果. 綜合以上所講,我選擇IT couple,跟個人喜好非常有關係. 但吾代表direct couple吾好聲. 原因可能係我唔夠技術和電學知識. 所以我講嘅嘢都唔可以盡信,只可作參考. 最後修改時間: 2026-05-19 16:07:46 |
bambino 正式會員 61.xxx.xxx.40 |
2026-05-19 15:53 |
| [#5801] 單端胆機同好會 hi bambino兄, 謝謝你的回應,我大致明白你所描述的聽感,這一點亦都是我所想要的,只要分析力和力度不比直接交連差,我選牛交連就沒有錯了,我打算用全牛交連其中一個原因是牛交連的低頻力度比起電容交連好太多了,分別好像虎吼和貓叫那樣大,十幾年前我在一次網聚聽過一位網友DIY的輸出牛前級和電容交連前級的比試,一開聲一秒就分出勝負,另外一個原因是全牛交連可以對地回路干擾提供無限大阻抗,這一點對於單端機來說非常重要,阻斷了地回路干擾,音場,空間感和空氣感的改善非常巨大,如果進一步在所有訊號交連上提供對地回路干擾無限大阻抗,音質改善將會是非常可觀的,年輕時看Stereo Sound,看到佐久間的全牛交連膽機,當年不知道牛交連的好處,以為是這個人太頑固才這樣堅持,後來自己玩hifi的經驗原來在非平衝系統,只要稍稍作出對地回路干擾的阻斷對音質的改善都是立桿見影的,於是買了電源隔離牛,在電源線加上大量共模扼流圈,電源線和訊號線單端浮地等手段都用盡了,結果是音場大了幾倍,空間感空氣感大幅提升,本來只在全平衡系統才能有的音場和空間感,空氣感都可以在自己的土炮diy單端機上都聽得到,所以我打算進一步用全牛交連前後級試一試還能有改善空間沒有? 最後修改時間: 2026-05-19 17:17:49 |
JimmyDIY 正式會員 112.xxx.xxx.146 |
2026-05-19 17:14 |
| [#5802] 單端胆機同好會 Using IT instead of capacitor for coupling is the better solution but a big more expesnsive. On the other hand, the cathode bypass capacitor do affect the sound quality. Having high quality bypass capacitor such as prolypropylene or oil type would be better. This is why some DIYer's use filament bias or fixed bias to eliminate the effect of the cathode capacitor distortion. So, the best is no capacitor in coupling and decoupling bypass. Johnny |
johnnykmtang 會員 88.xxx.xxx.43 |
2026-05-19 18:22 |
