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| [#122] 好聲的探索 #118＞＞＞知道Stradi這個牌子有出AD1. 如果要買復刻AD1的話,我諗會考慮EML AD1. 我對EML比較有信心,而且EML AD1有出UX4 pin version. 可以同10/VT25和300B共用膽座. 如果用AD1作為driver tube的話, 同300B一樣, 我想用IT做交連. 但好的IT(2.5K, 60mA dc for AD1)吾易找. 一般IT只係做到30mA dc左右.＞＞＞ 共同膽座，確實好方便。可以會唔同嘅膽玩。 AD1 的IT 牛，是否可以用300B 的1:1 IT? 下圖是全DHT 設計理念的後級，有時我們發燒友之間吹水。就話可否做一臺機。用不同國家嘅膽。集合德英美三國。 例如。input 膽用"德國"AD1,Driver 用"英國"PX25/PX4, output 膽用"美國"211/845  |
WilliamsonAudio 正式會員103.xxx.xxx.47 |
2025-02-16 07:16 | |
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| [#123] 好聲的探索 #120, 嘩! 咁快就整理好10系列膽的資料. 唔該晒...... 其實Raytheon 10 ST bottle都係用barium oxide coated filament. 同WE VT25一樣用7V Vf. 不過有Raytheon 10膽的人很少, 中伏機會好微. 最後修改時間: 2025-02-16 09:34:42 |
bambino 正式會員 210.xxx.xxx.231 |
2025-02-16 09:34 |
| [#124] 好聲的探索 .....AD1 的IT 牛，是否可以用300B 的1:1 IT?...... 雖然300B OPT多數都係3.5K Pri,但我見人用IT的話就係5K (或者如圖中3K IT都可以,不過未試過). 如果用5K IT喺AD1度,吾知會吾會好聲. 這方面我沒有經驗. 50/60mA dc IT, 要有質素的確不易找. 只要有合適及好聲的膽,三個聯軍當然係好事. 就好似睇NBA All-Star game咁, haha :-) 不過AD1做Input嗰gain得4x,好似細咗啲. 好處是屏阻細,但大屏流. 物理就係咁,屏流大屏阻自然下降. 有得有失... 另一德國膽可考慮是RS242. 除vintage TFK外, EML 及 Stradi 都有復刻. RS242做driver都可以.  最後修改時間: 2025-02-16 10:24:36 |
bambino 正式會員 210.xxx.xxx.231 |
2025-02-16 10:14 |
| [#125] 好聲的探索 I believe there are many mis-understandings with the Z of the Inter-stage transformer. In order to get the best performance out from the IT, the secondary shall leave it open. Of course, the IT may have resonance or ringing at the high frequency end which needs to be damped. Johnny |
johnnykmtang 會員 70.xxx.xxx.22 |
2025-02-16 11:59 |
| [#126] 好聲的探索 ＞＞interstage 或前級牛次級並電阻 我post 過幾次 隻推動胆在A1工作佢只係需要望到足夠初級电感(例如用3K load 300B, 符合標準8亨per K ohm，3K =24亨)，幾K:幾K其實係冇意義，唔並次級电阻等於隻胆在constant current 工作而次級load impedance 係極高阻抗綫性更高, 隻胆loadline係打横失真更低 就算如果有ringing, 用snubber network 去damp都唔好直接用电阻terminated 就算最後隻功率胆進入A2, loadline 係按住功率胆栅阻漸漸删減把loadline慢慢打斜，相信隻功率胆栅極变到幾少都唔會低過3K ohm, 所以次級唔terminated好處多，動態更好失真更低 最後修改時間: 2025-02-16 15:34:50 |
niceday009 正式會員 203.xxx.xxx.32 |
2025-02-16 15:18 |
| [#127] 好聲的探索 typo ＞＞隻推動胆在A1工作佢只係需要望到足夠初級电感 Correction 隻推動胆在推隻最後端功率胆，如果隻功率胆當時或永遠只在A1工作，隻推動胆只係需要望到足夠interstage初級电感，幾K:幾K其實係冇意義，因為當時推動牛之次級係load住最後端功勞胆栅極之極高阻抗，例如50K至470K 最後修改時間: 2025-02-16 16:03:10 |
niceday009 正式會員 203.xxx.xxx.32 |
2025-02-16 15:57 |
| [#128] 好聲的探索 Hi Johnny here are the photos of the mm and mc card I removed from the old Primare 928, the mm card is close to the mc card so the view is not very clear appreciate any advice Thanks 最後修改時間: 2025-02-16 17:01:48 |
muzixman 正式會員 119.xxx.xxx.211 |
2025-02-16 16:58 |
| [#129] 好聲的探索 mm card  |
muzixman 正式會員 119.xxx.xxx.211 |
2025-02-16 17:02 |
| [#130] 好聲的探索 mc card  |
muzixman 正式會員 119.xxx.xxx.211 |
2025-02-16 17:02 |
| [#131] 好聲的探索 #130 you should show the beautiful look of 928, so cool, it was once my dream gear 最後修改時間: 2025-02-16 18:11:50 |
niceday009 正式會員 218.xxx.xxx.220 |
2025-02-16 18:08 |
| [#132] 好聲的探索 Hello Muximan, Wow....... thanks for showing the pictures of your MM & MC cards. I don't have the information like the schematic of your preamp. It is just impossible for me to know what to do with it. Well, usually the MM section would require connection to the +Vcc/-Vcc, gnd, RCA IN and Out. If you can find them, you can easily hard wire them in the preamp. Just in case, the MC and MM share the same connections with individual IN and OUT. Then, it is perfectly OK simply plug another one IN. Johnny 最後修改時間: 2025-02-16 23:03:20 |
johnnykmtang 會員 70.xxx.xxx.22 |
2025-02-16 23:01 |
| [#133] 好聲的探索 I now see the back panel of the Primare 928. The MC card output must be connected to the input of the MM card through the control at the front panel. I really don't think you can put two MM cards in this preamp. Do you want put them in like piggyback??? Johnny  |
johnnykmtang 會員 70.xxx.xxx.22 |
2025-02-16 23:11 |
| [#134] 好聲的探索 If you think the MC section doesn't sound good, you can use Step Up Transformer or MC preamp to feed to your Primare 928. I cloned the Mission 776's MC and MM and found it sound real good. It's a very simple transistor circuit with 24Vdc power supply. |
johnnykmtang 會員 70.xxx.xxx.22 |
2025-02-16 23:13 |
| [#135] 好聲的探索 I think I understand your intention swapping out the MC card with MM card. In fact, the MC card is a straight forward linear amplifier with gain of x10 to x30 which amplifies the MC cartridge output from say 0.2mV to 5mV which feeds to the MM phono. The MM phono would have much higher gain and RIAA equalization. Therefore, the MC and MM preamp has very different function and characteristic. Just my guess. Please excuse me if my understanding is not correct. |
johnnykmtang 會員 70.xxx.xxx.22 |
2025-02-16 23:28 |
| [#136] 好聲的探索 #123, ＞＞嘩! 咁快就整理好10系列膽的資料. 唔該晒...... 其實Raytheon 10 ST bottle都係用barium oxide coated filament. 同WE VT25一樣用7V Vf. 不過有Raytheon 10膽的人很少, 中伏機會好微.＞＞ 因為是用AI 做Summary（web search）, 所以快。可以作初步參巧。 |
WilliamsonAudio 正式會員 182.xxx.xxx.105 |
2025-02-17 07:24 |
| [#137] 好聲的探索 哈哈, 犀利! :-) 最後修改時間: 2025-02-17 09:22:30 |
bambino 正式會員 210.xxx.xxx.231 |
2025-02-17 09:22 |
| [#138] 好聲的探索 hi niceday, here it is the Primare 928, typical 80s design  |
muzixman 正式會員 119.xxx.xxx.166 |
2025-02-17 12:15 |
| [#139] 好聲的探索 hi Johnny, you guess right. so I think the only way to make use of the mm card of the old Primare which I have thrown away is to DIY a phono amp using the mm card, right? The arrowed part under the transformer get quite hot even in stand-by mode, I want to put it into a separate box with heat sink and probably a small cooling fan, is that possible? Thanks  |
muzixman 正式會員 119.xxx.xxx.166 |
2025-02-17 12:25 |
| [#140] 好聲的探索 Hi Muzixman, I don't have a clue about the circuit and design of the Primare 928. Therefore, I would leave it to someone who may offer their help with your question. Johnny |
johnnykmtang 會員 70.xxx.xxx.22 |
2025-02-17 17:23 |
| [#141] 好聲的探索 I remember I brought my 300B to a guy's home for demo many years ago. He said to me that he was surprised that the headphone sound real good indeed even better than his audio system. I believe the headphone is very easy to drive with high fidelity. That's why the music producers putting on their headphone for mixing of the music they produce. I think the headphone can be kind of reference for comparing our audio system. If your system sounds good as the headphone, your system is must be good. If it sounds better, Congratulations!!! |
johnnykmtang 會員 70.xxx.xxx.22 |
2025-02-19 02:51 |
