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| [#5823] 單端胆機同好會 #5821 Jimmy 原子粒整流改成膽整流可能抗干擾有幫助. 我自己冇AB比較過,吾敢亂講. 但有吾少廠機用原子粒整流都吾問題. 例如Marantz 7 和 Audio Research SP-3A. 佢地連水缐都冇,一樣係咁. 真正問題未必係線路. 可以留意下零件安裝位置和走線路徑. 玩磁環只是二十年前初玩hifi的小實測. 當時SSP有得賣. 套係電源線的接頭後面. 我吾太喜歡玩一些gadgets. 原因係可能對某方面音效有些改善,但總會帶來side effect. 我知有好多人鐘意玩一些小玩意,但我就沒有興趣了. 最後修改時間: 2026-05-22 13:27:21 |
bambino 正式會員61.xxx.xxx.40 |
2026-05-22 13:24 | |
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| [#5824] 單端胆機同好會 Fisher 亦用原子粒整流 好多老友捧場  |
伊雲士 正式會員 81.xxx.xxx.89 |
2026-05-23 00:28 |
| [#5825] 單端胆機同好會 日昇音響 YS ENCORE 845 mono block演示 https://fb.watch/HEv-lascKT/  最後修改時間: 2026-06-10 10:09:29 |
johnnykmtang 會員 70.xxx.xxx.22 |
2026-06-10 10:08 |
| [#5826] 單端胆機同好會 嘩100磅重....each |
hahayanyan 正式會員 86.xxx.xxx.153 |
2026-06-10 17:45 |
| [#5827] 單端胆機同好會 WAVAC 833a: Overkill for Most Systems, Magic for the Best https://forum.audiogon.com/discussions/wavac-833a-overkill-for-most-systems-magic-for-the-best  |
johnnykmtang 會員 70.xxx.xxx.22 |
2026-06-28 19:34 |
| [#5828] 單端胆機同好會 If I were forced to explain the difference using an analogy, I would compare amplifiers to hearts. A small EL34 integrated amplifier is like a mouse's heart. Fast. Energetic. Perfectly capable of sustaining a small organism. A good 845 amplifier is like the heart of a human being. Larger and more powerful, it moves a much greater volume while remaining calm and controlled. The 833A is the heart of a whale, capable of moving an extraordinary amount of material with a single effortless contraction. ---------------------------------------------------------------- When 833A is placed next to GM100, 833A is like a baby whale heart at best.  最後修改時間: 2026-06-28 20:10:46 |
bambino 正式會員 61.xxx.xxx.40 |
2026-06-28 19:56 |
| [#5829] 單端胆機同好會 833A 與 GM100 會不會像WE212一樣因為高壓而發放幅射的? |
JimmyDIY 正式會員 112.xxx.xxx.146 |
2026-07-01 05:24 |
| [#5830] 單端胆機同好會 Simple test fixture for 300B I just made this for checking the condition of the 300B. I set the Plate Voltage to 350Vdc and measure the negative bias voltage which allow 60mA through the tube. It shows that many of 300B that I have are way out of spec. Ah oh............Too bad. It's the real 夢幻魔球. My question is :- how would you know the condition of the 300B's that you own???  最後修改時間: 2026-07-01 18:27:14 |
johnnykmtang 會員 70.xxx.xxx.22 |
2026-07-01 18:17 |
| [#5831] 單端胆機同好會 Curve Tracer DIY： https://www.bartola.co.uk/valves/tag/tube-curve-tracer/page/2/ |
LaLaLam 會員 112.xxx.xxx.40 |
2026-07-01 19:40 |
| [#5832] 單端胆機同好會 Curve tracer is great to determine to optimal operating point. Of course, it does tell us the conditon of the tube. However, it is rather difficult and expensive to buy or make one. |
johnnykmtang 會員 70.xxx.xxx.22 |
2026-07-01 23:27 |
| [#5833] 單端胆機同好會 Both LInLai and JYL would set up the power supply with 300V B+ and -60V for the grid. Then, it takes the reading of the plate current. The matched tubes would have the same plate current. I did it a bit differently. I set the B+ to 350V. Adjusted the negative voltage to the grid for 60mA plate current. Then, I take the grid voltage as my reference for matching. With this method, I can get the tubes matched in my amp. Yeah. By the way, you can test your 300B to see if it is the getting weak with the same method.  |
johnnykmtang 會員 70.xxx.xxx.22 |
2026-07-08 12:15 |
| [#5834] 單端胆機同好會 it's matching tubes by comparison at different operating points. in either cases, it uses a single operating point as reference. it's not matching by comparing characteristic curves. although not ideal, it's very easy to implement. what matter is how you measure grid voltage. voltage across grid and filament mid-point, vs voltage across grid and filament negative end......it makes a big difference. |
bambino 正式會員 61.xxx.xxx.40 |
2026-07-08 13:38 |
| [#5835] 單端胆機同好會 Hi Bambino, I use two 27 ohm resistors across the filament pins. The cathode current is going through the center tap of the resistors. I believe this should be OK. |
johnnykmtang 會員 70.xxx.xxx.22 |
2026-07-08 19:43 |
| [#5836] 單端胆機同好會 What she said was that the cheap SE EL34 amp sounds better than most other 300B amps. However, she just finished building one 300B with good quality components which sound fantastic. However, this 300B amp price is would be much higher because of the cost of the materials...... So, the point is that the 300B is a great magic tube but it needs a good circuit and components to show its charm.  |
johnnykmtang 會員 70.xxx.xxx.22 |
2026-07-13 19:06 |
| [#5837] 單端胆機同好會 Actually, EL34 can be drived more easily than the 300b. This happened on their difference of interelectrode capacitance, especially the plate-grid capacitance ”so called C-miller”. EL34 got a low Cag1 (1pF) as the capacitance is blocked by g2/g3. However, for 300b, there is only one grid, the Cag is over 20pF including tube socket as measured by an impedance analyzer (shown below pic). Also, the Cag value and its Q-factor changed a lot when apply different filament voltage. Therefore, 300b needs to have a powerful driver stage to get rid of the miller effect and perhaps can yield a better performance.  |
LaLaLam 會員 58.xxx.xxx.69 |
2026-07-13 21:25 |
