- #3754 [WilliamsonAudio], 24-03-27 19:03
- #3753 [johnnykmtang], 24-03-27 18:41Hi Niceday,
Well, you bring up a very good question on Low distortion or some distortion. With some distortion (harmonics), it colorized the signal just like putting on make ups. Most of the amps in the market have their own design philosophy which is their secret.
It is just like the cup of tea or coffee what kind of taste you would like. I have been trying to get low distortion throughout each stage in my tube amps during the past two years. It is a wonderful experience and feeling of the pure/clean sound. Would it sound like the transistor/solid-state one? Absolutely NOT.
Johnny - #3752 [niceday009], 24-03-27 17:46謝謝Johnny, 我當6CG7 2nd order 唔係0%,而當佢0.01%,都比6SN7 少十幾倍harmonic distortion
部Ultimate 845 single 將300B同845上哂电後,會再從新試所front end stage,最少八個綫路,要長時間聆聽及測試才知最後winner
6CG7 咁低失真將會係另一個candidate, 暫時係sim 出嚟最低harmonic product
話分兩頭,Audionote 向來都唔用CCS stage去drive 300B, 佢係部頗貴P3,P4 就咁用5687 load 15K 14mA 去 drive 300B, 出94V P to P失真1.1% 2nd order, 0.09% 3rd order(用vtadiy.com sim,應該準)比6CG7 CCS 大幾十倍,是否行頭巨龍Audionote 認為CCS 之勁低失真結構对声音冇幫助?抑或佢認為加入某數量2nd , 3rd order harmonic 先係靚声?
大家点睇
最後修改時間: 2024-03-27 18:03:36 -
- #3751 [johnnykmtang], 24-03-27 10:08Hi Niceday,
The calculation is correct. Mind you that there would be some tolerance as the spice model used in the calculator may not perfect. Also, the result may be a bit different in real circuit.
Anyway, this is a very good tool to determine the best bias of the tube in the circuit. Just minor adjustment is needed in real circuit.
Johnny - #3750 [niceday009], 24-03-26 23:05May I draw your attention, 刚係vtadiy.com 試用佢個Triode simulator, 有個大發現
6CG7 係170V 5mA CCS 或choke load, 居然可以低失真到離譜
94V P to P output 居然係0%2nd order, 0.03%3rd order, 比出名低失真之6SN7 低成N咁多倍, 0%2nd order 係天荒夜譚
呼籲有LTspice的師兄 run 一次求正一下,如果係真,6CG7先至係ultimate 845 single 真命天子
最後修改時間: 2024-03-26 23:11:00 - #3749 [cshingyau], 24-03-26 17:32好期待.
- #3748 [niceday009], 24-03-26 16:03#3747
图示大果款双C,用Enchanced Hi B 日本JFE 0.23 高牌號芯
係按自己設計委託牛廠去繞制,4夾3,3500圈初級,12K:8 ohm, 女工用排線机繞,制做過程全程微信互動,用Teflon 層紙, Epoxy 骨架
經驗做845單端牛,有24W 35Hz輸出,起碼有5kg 60H才叫可以,如果想低頻動態反應更好就要更大芯及更高电感,Audionote 自己都咁話現在845線路可出A1 26W, A2 36W, 所以要更大磁通飽和余度
*唔好以為分綫組分得多就一定好好多,Audionote 对十幾萬211銀年都係4夾3,我深信幾間老字號牛廠是按實際音响效果設計牛,無需上到100kHz, Lundahl, Sowter, Magaquest, Hammond, Audionote, Tango, Tamura, 平直過由27kHz -1dB就OK, 無需要係高週方波好直,而同牌子同功率但貴咗係貴係個磁芯,矽鋼片都有好多grade,电感大磁通大及coercivity 低才是買單端牛基本準則(當然隻牛要設計正常)
最後修改時間: 2024-03-26 16:20:07 - #3747 [cshingyau], 24-03-26 14:54好期待你早日開聲。用隻乜嘢output呀有成8kg咁重?
- #3746 [niceday009], 24-03-26 00:31Ultimate 845 single, progress up to this point
I call it a day
我諗用有經驗砌機師傅都要七八日先至砌得起兼調試,叫兩個人幫手裝2x 8kg Double C Core 係好係嘢
最後修改時間: 2024-03-26 00:44:41 - #3745 [niceday009], 24-03-24 11:44用6H30 隻plate choke 30H 就夠,用ECC99隻choke 要60H, 我做到130H係方便如果將來用其他胆可能内阻較高, 例如12BH7A, 6CG7, 6FQ7款款唔同声音
部219焊來焊去焊到七彩,之後係終極845机才試其他驅動胆
我口味係偏愛用低內阻高电流中Mu胆,暫時最愛係ECC99 同6H30pi, 6H30pi 有種不尋常之動態感
最後修改時間: 2024-03-24 11:50:43 - #3744 [niceday009], 24-03-24 11:29而家落手做就將其中一volume換成3格band制,分別係0dB, -6dB, bypassed volume control with -7dB
- #3743 [niceday009], 24-03-24 11:14#3742
只是之前用ECC99時整部机gain太高所以加多級VR做gain control, 令到用手扭轉volume 制手感暢順D
1. ECC99 cathode degeneration → ECC99 choke load →部机185倍 gain
2. 6H30 cathode degeneration → 6H30 choke load →部机87倍gain,不需加多級volume, 但部机已經在錶頭旁邊做了兩個旋鈕掣,就用埋個制佢
最後修改時間: 2024-03-24 11:24:57 - #3742 [DY2036], 24-03-24 10:33
nice師兄睇完你幅電路圖有個地方唔係好明想請教一下,輸入端點解會有兩隻VR,一隻100KA另一隻50KA其實各自是否有唔同功能。 - #3741 [niceday009], 24-03-24 02:26呢幅可能清D
- #3740 [niceday009], 24-03-24 02:065個線路中動態及活力度最好,細微信號出得清晰而冇active CCS些小附帶音(之前用cascade DN2540 已經係較純,但choke load 更滑更warmth),choke load 多了一份厚滑度,音場還原好
動態及力感主要係歸功枝6H30pi
最後修改時間: 2024-03-24 02:17:18 - #3739 [niceday009], 24-03-24 01:03部219内部已實驗了多個驅動circuitry, 改到七彩,等部Ultimate 845 single 出世時,係時候休息安享晚年
我最喜歡用的交連电容是Relcap RT, Polystyrene 介質,Multicap RTX 同樣Polystyrene 高頻比RELCAP RT 更透明幼細,但Relcap RT 在中低頻更有實体感更有重量
最後修改時間: 2024-03-24 01:57:29 - #3738 [niceday009], 24-03-23 23:38之前試幾款驅動綫路就係用呢部勵磁219大改去試声, 用以下1至5推300B, 再interstage 推845
1. 6H30 cathode degeneration > 6H30 active CCS ,RT cap couple 300B
2. 6H30 cathode degeneration >6H30 134H choke load ,RT cap couple 300B
3. EC8010 active CCS, direct couple 300B, no coupling at all
4. ECC99 cathode degeneration > ECC99 cathode degeneration ,RT cap couple 300B
5. 1:3 permalloy step up transformer > parallel 6922 134H choke load ,RT cap couple 300B
以上5款,最Hi Fi 又最自然 係2, 低頻之急勁及迫力係冠軍,微細訊號最出得清楚,6H30 PI貴得有道理
第4款ECC99 degeneration 係最豐潤飽滿,中低及低頻墊底更有份量,冇6H30pi快速勁揪低頻,魚與熊掌,嘆世界我選ECC99 cathode degeneration
用丽磁D垃圾牛都效都唔錯,將來部Ultimate 845 single 用Extra Hi B 4%nickel impregnated with laser etching, 動態只會更狠勁,更飽滿
丽磁隻牛4.3kg得36H DCR 350 ohm
Ultimate 845 single 7.7kg 95H, DCR 220 ohm
最後修改時間: 2024-03-23 23:54:31 - #3737 [niceday009], 24-03-23 23:21今日有Review33 Iloveuboy師兄到訪,帶了对加大碼Western Electric Replica 845嚟,尺寸大好多
D声至係關鍵,Western Electric Replica 845 細緻兼滑淨之如中低頻擊力可以同KR 845有得砌,KR 845賣2萬蚊一对, Western Electric 2500对,部終極845 single 砌完後一定買对
IloveUboy 師兄有好多靚胆,又有一对公認靚声好力V-CAP Teflon Cu, 當部Ultimate 845砌完攞V-Cap試下
最後修改時間: 2024-03-23 23:27:01 - #3736 [niceday009], 24-03-23 23:03將D剩低嘅心愛理研RMG用埋係呢部机度
用一粒,個世界就小一粒,点解D靚声零件D大廠都唔繼續生產......
Riken RMG, Rubycon Black Gate, Tamura interstage 牛,Tango interstage 牛......
最後修改時間: 2024-03-23 23:08:50 - #3735 [niceday009], 24-03-23 22:49原先是裝上Vishay rectifier 做1250V 整流,後來知道美国Diotec 有soft recovery diode , 可以避免P/N junction reserves spike 做成高頻噪音(spike 可以係輕微刺耳声音),拆走所有Vishay 換上美国Diotec, 貴過Vishay 兩倍幾
濾波电容係Vishay, Mouser 買57蚊一隻,長壽型,每日用24小時可連續用25年,每日用8小時就用75年,應該會長命過我地
最後修改時間: 2024-03-23 23:00:04 - 下一頁 (2 of 189)
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6CG7/6FQ7 是 6SN7 的小九腳版本,
所以特性非常(包括失真)之接近才合理。
當然會有區別,但區別應該不是十幾倍,或N 倍。 英國之前有人測試過. 記憶中區別不大的.需要點時間找資料出來.
https://artsdocbox.com/Television/93537481-6sn7-mu-follower-distortion-ian-thompson-bell-january-2009.html
上面是其中一個對比,雖然是Mu follower, 失真區別也是有限的.