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| [#5583] 單端胆機同好會 Tamura output transformer specification  |
johnnykmtang 會員70.xxx.xxx.22 |
2025-12-11 16:15 | |
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| [#5584] 單端胆機同好會 Nothing want to say. Promise is promise, I will cut the crap as long as the poor guy "welbourne" make speech here. I have no attempt to break the harmony. Yesterday, I just posted wrongly which I did post regarding hifi donation. Very simple, where the hypocrite "welbourne" is, where I am, fight to end. God bless here no longer for my crap being posted 最後修改時間: 2025-12-11 16:42:41 |
黃藥師 會員 182.xxx.xxx.252 |
2025-12-11 16:41 |
| [#5585] 單端胆機同好會 黃藥師, Thank you. I really wish I could have the opportunity in testing on the Chinese tube amps. Then, I can provide my findings how good they are. Recently, I got the Audio Note M5 line preamp from a friend who asked me for repair. Then, I can check it out many details that puzzled me for a very long time. Cheers, johnny |
johnnykmtang 會員 70.xxx.xxx.22 |
2025-12-11 21:40 |
| [#5586] 單端胆機同好會 你好，johnny。 小白想了解一下，假若師兄手中有一臺國產膽合併机在手，你會測試它在THD 1%最大輸出、FFT奇次和偶次失真、1K 10K 20K輸出波型等基本數據, 還有其它特別影響聲音好壞的測試嗎？ |
ilovetheboy13 正式會員 45.xxx.xxx.11 |
2025-12-12 11:28 |
| [#5587] 單端胆機同好會 Hi ilovetheboy13, Thank you for your good question. As a DIYer, there are just so many things I would check on an amplifier to see how good it is. 1. Circuit design. 2. Components used - tubes, resistors, capacitors and transformers. 3. Componets layout. The FFT analysis and THD specification don't mean much. There are many ghosts hidden from these test. I believe we shall look into the distortion at each stage rather than looking at the final output. This is a very big topic. I would not take too much time writing all the details here. Anyway, what I would say is that it is difficult for me to tell whether the amp is good or bad from few tests. If you have further question, I would try to share my experience with you. Cheers, Johnny |
johnnykmtang 會員 70.xxx.xxx.22 |
2025-12-12 17:18 |
| [#5588] 單端胆機同好會 呢幾日去咗朋友個場，我想大家去買單端牛前理解牛芯物質音色特性，最近我將对新繞鎳合金(查過原來只係27%鎳成份)interstage去朋友處裝落佢部前一期Ultimate 845, 其聲音变化係好明顯，鎳合金的中低頻活躍性係最突出，厚潤度亦最高，Audionote 咁鍾情鎳合金仲賣到殺人咁貴係有原因 不過又唔可以全部人都選擇，我另外兩位朋友好注重中高頻細節及整體分析力，超微粒果種，Glass metal之非晶或Nano Crystalline(也是Glass Metal其中一種，是將原來非晶再做熱處理令導磁更高)係可以在任何場合都可以提供超多細節，就算係大堆頭交响樂背景所有細微細節都可以聽得清楚 如果你套組合和喇叭平時高頻分析力弱而渾厚声底，Nano Crystalline 係可以幫到手將套Mid Fi 变成Hi Fi, 尤其是用貴價全音喇叭 但如果你套組合和喇叭本身已高份析力，Glass Metal可能令声音偏冷and dry, 反而鎳合金係可以令此組合增加質感和動感，国内都有些有經驗關於铁芯物料，下則是我刚在網上睇到，完全同我聽到一致 "JimmyDIY 发表于 2011-12-8 17:44 [i=s] 本帖最后由 JimmyDIY 于 2011-12-8 17:45 编辑 [/i] 我比較喜歡用鎳合金的牛芯,中高音的密度很高,泛音很豐滿,一聽就立即中毒!其次是Hi-B鐡芯牛,全頻很乾淨通透,頻寬在各種牛中最闊,低頻潛得很深,高頻上得很高,非晶牛音色平衡就很不習慣,高頻很多音色很冷,聽得很不舒服,個人不會選用."  最後修改時間: 2025-12-12 21:17:14 |
niceday009 正式會員 61.xxx.xxx.130 |
2025-12-12 20:58 |
| [#5589] 單端胆機同好會 Hi Eric, https://www.review33.com/avforum/index.php?topic=69200803122315&item=&page=1 JimmyDiy 是R33 其中一位師兄 |
WilliamsonAudio 正式會員 182.xxx.xxx.43 |
2025-12-12 23:24 |
| [#5590] 單端胆機同好會 Wilson, 呢位JimmyDIY 師兄係懂得牛比交連电容好，唔係好少少係好好多，當然隻牛要做得正確靚声才可以，就因為咁Audionote 就賣55%鎳合金前級牛要5萬蚊一对......除咗FM, Audionote 係第二位最搶錢Hi Fi 廠家 當然的果隻Triode 用plate choke load 然後直接交連係最好，係唯一嘅最好，唔係其中的好 最後修改時間: 2025-12-12 23:39:28 |
niceday009 正式會員 61.xxx.xxx.130 |
2025-12-12 23:32 |
| [#5591] 單端胆機同好會 #5565 "" 之前一直間中困擾市电噪聲問題，我幢大厦天台租咗俾中國移動做轉發射站，有時突然一段時間D高音標高好多而中低音縮減，一直未解決，直至前幾日又出現，攞返隻買咗成十年但未用過嘅大陸三百蚊全新八達电源濾波插座，本著冇乜太大期望，一插入power amp 專用濾波插頭，D声正常返好多 大家有冇類似事件可分享一下，因為當大厦市电干擾大時，D声係唔聽得，而係夜晚十一二點時，D声鬼咁靚又滑又豐潤，想了解大家点處理？"""""" 根據資料，分析如下， 加入line filter 后，有改善，證明扞擾來自電源的傳導(conduction)扞擾。在那一刻， 無線電""輻射""(radiation)嘅干擾係同時間存在。 但係當你加入咗濾波器之後聲音改善就證明係電源嗰部分進入嘅，所以應該集中喺電源嘅傳導性嘅問題去處理。 最後修改時間: 2025-12-13 00:22:24 |
WilliamsonAudio 正式會員 182.xxx.xxx.43 |
2025-12-13 00:22 |
| [#5592] 單端胆機同好會 謝謝各位引用我舊文,原來有咁多知音人,其實我已買齊全套舊Tango單端牛和CHOKE,打算搵YS Audio Nelson兄幫我砌套300B後級,不過Nelson兄話Tango X2.7S輸出有40W,砌300B嘥咗,不如改EML1605,單端有20W,但要換電源牛,因為我想全套Tango牛,當時Tango已停產,ISO又未出世,加上當時大嫂由大陸單程落香港同住無地方玩HiFi了,所以就丟低無再攪,一停就十幾年,後來ISO復產,又買多對NC20F,加上之前訂的舊TangoNC20和X2.7S,打算做一對全牛交連1605後級,現在只欠電源牛,因為就快要搬細屋,未攪掂之前唯有暫時按兵不動住. |
JimmyDIY 正式會員 112.xxx.xxx.146 |
2025-12-13 01:38 |
| [#5593] 單端胆機同好會 Hi JimmyDIY, Here is the schematic that I just made up for your interest. Johnny  |
johnnykmtang 會員 70.xxx.xxx.22 |
2025-12-13 05:36 |
| [#5594] 單端胆機同好會 #5565 最近買了這個，方便分析電源的Noise. 因為可以數據化。  最後修改時間: 2025-12-13 08:37:51 |
WilliamsonAudio 正式會員 182.xxx.xxx.43 |
2025-12-13 08:34 |
| [#5595] 單端胆機同好會 Wilson, 我都係咁諗，主要係电源干擾，即刻去買返個老虎魚噪聲測試儀 |
niceday009 正式會員 182.xxx.xxx.158 |
2025-12-13 13:25 |
| [#5596] 單端胆機同好會 一件事情有兩面睇法，有同好喜歡鎳合金，也有其他人發現非晶牛係非常歡喜, 我刚刚聽完Nano Crystalline Interstage, 無疑仔細解像力係超羣，最細微都聽到 .https://www.audioasylum.com/messages/KandK/3413/amorphous-core-output-transformers Amorphous Core Output Transformers 69.248.130.96 Posted by davidvair on January 19, 2005 at 07:23:42 Lundahl Amorphous Core Output Transformers (A Review) This review concerns the effects observed upon switching the standard Lundahl (silicon-iron core) output transformers in my power amplifiers, to Lundahl’s new (amorphous core) output transformers. My current stereo system (for context): Sources: 1. Analog: Basis Audio 2001 turntable, Basis Audio Vector tone arm, Audio-technica ML-150 MM cartridge 2. Digital: Arcam DVD/CD player, Adcom 575 CD player Preamps: 1. Phono-stage: McIntosh MX 113, and Lehman Audio Black Cube 2. Bent Audio TX102 MK.II tapped transformer passive preamp Power-amps: 1. K&K Audio 300B push/pull (20 Watt, 3 stage, class “Aâ€, all transformer coupled, zero feedback, mono-blocks) Speakers: 1. Reimer McCullough GS monitors (94db, 4ohm; M-T-M design) Cabling: 1. Synergistic Research Preliminaries It seems useful to note some things at the very beginning. Previous reviews are few in number, far too understated and too brief. This proves to be less than helpful in convincing the would-be buyer that the significant increase in cost is worthwhile (especially in a product that cannot be easily returned once tested). Furthermore, these new transformers require “burn-in†time and this has only added to the buyer’s hesitation. The purpose of this review therefore, is to hopefully help shed some much needed light on this rather SIGNIFICANT new transformer technology, and dispel some of the fear attached to the pursuit of the unknown. The question of “burn-in†Yes they need burn in. No, I don’t know why. Quite frankly, I don’t really care either. Some people will tell you that “burn-in†is psychological as your brain adjusts to the new sound. Well, this did not pertain to my situation; I never got to hear the initial “burn-in†period. That was taken care of for me by Kevin Carter of K&K Audio, who happened to install my new amorphous core transformers. For me, I simply had them dropped off at K&K Audio, and five days later, picked them up. What I did hear, was something profoundly different than what I had heard five days previously in my old system. Kevin informs me that the most critical and sonically relevant “burn-in†period is about the first 50 hours. Once started from cold, at hour zero, they apparently sound rather similar to their silicon-iron counterparts. However, the similarities begin to diverge rather noticeably at about hour 10, at which point the transformers begin to sound like completely different entities all together, and by hour 50 you have in short “arrivedâ€. Kevin did make it clear to me that the amorphous core transformers would continue to improve over time, but that the changes would grow less dramatic at this point (after hour 50) and be spaced farther and farther apart. In other words, they would continue to improve but the new improvements would be more like refinements and happen slowly even for months. I cannot describe for you the first 50 hours of “burn-in†(except to describe the initial sound difference from the old transformers later in this review), but I can tell you what has happened regarding their continued “burn-in†since the several hundred hours I have put on them over the last few months. I would say that once I had received the mono-blocks back from K&K Audio, the sound improvement was jaw-dropping (more on this later). I then set out to give the new transformers a rather serious musical workout for several hundred hours to see if they would indeed improve any further. What my wife and I experienced was that the amps sounded noticeably better after an additional 50 hours was worked through them (so about 100 hours from hour zero). Following this, the amps became more refined, open, and subtly nuanced at about the 200 hour mark. Lastly, they have as Kevin said, continued to improve, essentially growing more musical with each passing month. My wife and I never had the feeling that we were missing out on something as the transformers were going through this “burn-in†process. Quite the contrary, we were thrilled with the substantial improvement over what we had heard from our amps before; the continued improvements over time simply seemed like icing on an awesome cake. “The Switch†(our amps with the new amorphous core transformers arrive) How do they sound compared to the standard silicon-iron transformers? Let me make two things abundantly clear: 1. I DON’T EVER WANT TO GO BACK 2. PLEASE, PLEASE LUNDAHL, WE WANT MORE, MUCH MORE OF THIS!!! I am not kidding, I was not prepared for what I kept hearing and what I kept getting more and more of (though less and less over time). I am reluctant to say this as readers may get the wrong idea, thinking that the older version of Lundahl transformers were in some way flawed, but that is not the case. Traditional Lundahl transformers are excellent, one of the very best out there (some consider them to be the very best). However, Lundahl’s new amorphous core output transformers simply make the old ones sound broken. There, I’ve said it; and no, I am not exaggerating. The improvement in fidelity in our system is so significant that I keep asking myself if my amps had been broken before. Did Kevin tweak my amps or fix something that he had failed to tell me about? “No David, I simply swapped out the old transformers with the new amorphous core output transformers and burned them in for about 50 hours to make sure everything was behaving properly. Nothing else was done to your amplifiers. They were not altered in any other way.†The Sound Listeners I am sure will respond to the new sound’s overall gestalt differently, in accordance with their various tastes, stereo system’s idiosyncrasies, etc. However, I believe the following characteristics will stand out to most: a) Music happens outside the speakers. At times the speakers don’t even seem to be on (how a transformer core material is responsible for this beguiles me) b) Far more dynamic; and a sense of greater power. c) Frequency extremes have increased or can now be heard for the first time. d) Natural, instruments sound like themselves rather than synthetic copies. e) Lower noise floor. There is a quieter and blacker background. There is less hash, less grunge, less pain. f) Transparent; it is as if the transformer was removed. The window was replaced with open air. g) Effortless, everything seems less stressed h) Greater detail and resolution I once wrote to Marc Mickelson (editor of Soundstage! online magazine) asking him exactly what it was about the very best equipment that moved him so. He stated simply “they breatheâ€. He explained in our correspondence that with the best equipment music flowed rather than being manufactured artificially. I must borrow his expression here since I feel it best describes the overall experience of listening to music through the new amorphous core output transformers, “they breathe†with the music. Kevin at K&K Audio tells me that the amps’ bandwidth measure the same, as well as the power. He admits that the sonic differences are from a measurement perspective “mysteriousâ€, but empirically, readily hearable. I like Kevin’s attitude. He doesn’t use “BS†to sell his products and he isn’t afraid to admit when he doesn’t know something. As he says “I could tell you the theoretical reason for an amorphous core’s sonic advantage over that of its silicon-iron counterpart, but it still fails to explain the wholesale improvement we hear in the real world.†Regardless of how they measure, what my wife and I hear is that, in short, EVERYTHING is better. This is why I quote Mickelson on the “breathe†characteristic, it is the only hypothesis I can suggest for the improvement. Rather than increasing the frequency response (my amps were already excellent in this regard), increasing the power, or whatever, I believe the new transformers are doing something akin to letting the music through more faithfully and more easily. In a word it is an increase in overall “fidelityâ€. The amps sound faster, able to “get out of the wayâ€. The transients just happen, the notes decay naturally, and the harmonic envelope that surrounds each instrument glows more life like. You are encouraged to follow the music from its softest whisper to its loudest crescendo without fear of pain or fatigue the way we use to, unconsciously tensing up before the momentary bite would occur. I am not saying that this cannot get better; it already got much better than I thought was possible. Yet, there is now simply less of this “strenuous†experience. Music is fun again. I hadn’t realized how much of the sweetness of music could be had in a playback system. I love music. I have always delighted in hearing live orchestras and symphonies. Classical music, one of the last audible art forms that is regularly un-amplified is glorious to experience live. Sadly, however, I have not found this to be true when reproducing the same at home. Traditionally when played through most stereo systems, I have come away feeling as though I had just eaten instant mashed potatoes instead of the real thing. In contrast, rock and pop have not been so unpalatable and I think this may be the result of their extensive use of amplified, distorted and synthesized sounds. My ears seem to buy the illusion. However, the cello in a music hall un-amplified either sounds like it does live, or it sounds like elevator music. The point here is that with the new transformers, I am now listening to classical music 80% of the time! This is not to say that rock and pop now sound bad, on the contrary, its just that now a violin sounds like a violin, and “wow†is that a joy to hear. With 20 watts or so, one is encouraged rather persuasively to seek speakers of higher sensitivity. I have often considered increasing the power of my amps due to this very issue. Too many of the very good speakers out there do not come in the 96db and higher flavors. However, as I mentioned earlier, one of the results of the transformer switch was a perceived sense of greater power in the amps. Again, Kevin made it clear that the output power remained the same in the measurements. I can only surmise that this is due to that quality of the new transformers to “get out of the way†of the music. It is the same quality that has made them more dynamic, possessing a lower noise floor, more transparent, faster, etc. We have found that we can turn the volume up much higher than before without a sense of distortion, strain, or pain. The significance is that I am no longer concerned about the output power of my amps. I am not looking for more power; I am looking for more of what these amorphous cores give me, which is MORE MUSIC. If I had doubled my output power instead of switching to the amorphous core transformers, I would only have doubled the volume of what I had before, and remember I now feel as though the old version of my amps sounded broken. Why would I want a 40 watt broken amp? Do I really need twice the pain in my music? Bottom Line The new Lundahl amorphous core output transformers have wrought one of the greatest if not the greatest improvement in my stereo system, and my wife confirms this. I can’t speak to the SE version as my amps are PP, but if it is anything like this you are in for a shock. It does not turn your home system into live music, but it does help to create a far more convincing illusion of it; one that is very satisfying to listen to. I would equate the change we have heard in our home as equal to buying new speakers. What amazes me is that this was produced by only changing the core material of an output transformer. Sincerely, David Vair 最後修改時間: 2025-12-14 01:02:00 |
niceday009 正式會員 42.xxx.xxx.28 |
2025-12-14 00:58 |
| [#5597] 單端胆機同好會 刚刚有位朋友問我D類機有幾複雜，我summarize 一下各類amp之工作過程，亦都係我地仲係度hea嘅原因，基於一個信念，Simplest Circuit with best linearity parts = Good Sound, 有唔同意嘅請指正 不計算被動交連元件，各類放大器其电路在放大時需要做的過程: A. 三極單端A類全段零負回輸在放大中只有一個過程 1.就是只有直接放大，自1906年Triode發明時已經是這樣 B. 三極推挽A類全段零負回輸3個過程 1. 分相 2. 放大 3. 合相 C. 推挽四或五極A類或AB類在放大有4個過程， 1. 分相， 2. 放大， 3. 合相， 4.而放大過程被環路負回輸矯正失真及減低輸出阻抗 D. 現在D類在放大過程有很6過程， 1. 首先要做個三角波時基產生器 2. 將三角波高頻時基訊號混合原本音樂正弦波訊號輸入Comparator 透過轉換形成Pulse Width Modulation 訊號作輸出， 3. 之後把PWM 电压放大， 4. 之後將PWM 电流放大， 5. 再走入 low pass filter 变回正弦波， 6. 而且全過程用環路負回輸作矯正控制失真(或加上去控制PWM轉換之誤差，視乎設計) D類放要經過多重轉換，其失真亦係最大而需要更大劑量環路負回輸去矯正錯誤 E. 無負回輸OTL 胆機有4個過程 1. 分相 2. 电压放大 3. 电流放大 4. 合相 最後修改時間: 2025-12-15 00:17:56 |
niceday009 正式會員 42.xxx.xxx.28 |
2025-12-15 00:05 |
| [#5598] 單端胆機同好會 Hi niceday009, I would like to say the new balance push-pull amps doesn't require the phase-split stage. The XLR input would have both +ve and -ve inputs. Surely, the positive and negative signal will be combined and split at the interstage and output transformers. It is a bit more complex than the simple SE amp but it has its own advantage as well, i.e., lower distortion and higher output power. Johnny |
johnnykmtang 會員 70.xxx.xxx.22 |
2025-12-15 00:25 |
| [#5599] 單端胆機同好會 Hi Johnny, Yes the LTP in an amp already does the job, or true balance amp like what you said does the job intrinsically, like Ayre amps. ＞＞lower distortion and higher output power. If we restrict it in Class A, PSE and PP seem to have the same wattage, but certainly PP can be extended to B possessing more output power It seems to me that one more step of complexity would create different nature of distortion sonically vs the text book explaining the distortion measurement, for example, loop type negative feedback would greatly reduce the THD even on a well designed triode SE or PP amp, but after applying the loop feedback, the sound lost it's soul 最後修改時間: 2025-12-15 00:49:04 |
niceday009 正式會員 42.xxx.xxx.28 |
2025-12-15 00:32 |
| [#5600] 單端胆機同好會 I have been curious how good a full digital amp would sound like. I once auditioned the Marantz M1 streamer amp at a HiFi store. It sounds so good and having the sound character like a tube SE amp. The full digital amp get the digital signal all the way from its input to the final output stage. In theory the only distortion would happen at the final Digital-to-Analog conversion which delivers the power to the speaker. Such conversion would be the main source of distortion. With the advance in D/A technology and super high sampling rate, the distortion is getting smaller and smaller. Eventually, it will surpass the performance of any type of amps. This is just my imagination... |
johnnykmtang 會員 70.xxx.xxx.22 |
2025-12-15 01:20 |
| [#5601] 單端胆機同好會 Just meditate a while, if the amp is to deal with an analog sinewave signal, perhaps the balance amp consisting of two identical amp is the process of phase splitting, considering the vastly more components in balance amp vs a phase splitter |
niceday009 正式會員 42.xxx.xxx.28 |
2025-12-15 01:31 |
| [#5602] 單端胆機同好會 Hi Johnny, my friend bought the Marantz new digital amp and I paid him a visit and found it does sound decent, especially the bass strength, soild and powerful, also with good definition for full spectrum. For me it may lack of little zero feedback SE related distortion beauty which is the emphasized airy subtle sonic and added warmth. I admit, they are distortion but I have got used to it. 最後修改時間: 2025-12-15 01:48:58 |
niceday009 正式會員 42.xxx.xxx.28 |
2025-12-15 01:41 |
