review33.com: 影音天地: 單端胆機同好會

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[#4732] 單端胆機同好會 Not sure about the performance of its TVC preamp, really want to know		Bluesilver 正式會員 205.xxx.xxx.71	2024-12-13 06:45

[#4733] 單端胆機同好會
禾田茂氏。

A 就係傳統嘅Cathode,信號都係一條直路(1)

B 就係禾田茂氏。信號是(1)正相信號。再加上(2)負相信號（黃色）。所以我話他是"推挽"。負相的信號。又要經過V1反相，再經過C2,又再經過V2 , 行一大段路。再同正相信號。二合為一。正相信號和負相信號。不可能完美結合。因為負相信號。需要經多了額外的V2和C2.

最後修改時間: 2024-12-13 07:47:44

WilliamsonAudio

正式會員
182.xxx.xxx.234

2024-12-13 07:46

[#4734] 單端胆機同好會
和田茂氏之white follower 其動力感比較强，以前科宝曾出前級就係仿此机

不過又係果句，零負回輸設計一定在通透度與速度好好多

最後修改時間: 2024-12-13 12:22:44

niceday009

正式會員
182.xxx.xxx.137

2024-12-13 12:05

[#4735] 單端胆機同好會
講開膽前級, 我都想問下這馬蘭士7線路, 已裝好幾年聲音唔錯, 自己玩過前級中最好. 能改為無負回輸嗎? 我試過把75K電阻電路切斷, 效果很差, 雜音很多.

ck2007

正式會員
223.xxx.xxx.244

2024-12-13 14:31

[#4736] 單端胆機同好會
Hi CK2007,

Removing the 75K resistor from the circuit would cause huge increase in gain from x15 to x4900 (approx) and the distortion would be much higher.

75K resisotr must be there to maintain the gain of the circuit.

If you want to try the preamp with non-NFB type, you would need to get other one.

Johnny

最後修改時間: 2024-12-13 16:29:05

johnnykmtang

會員
70.xxx.xxx.22

2024-12-13 16:28

[#4737] 單端胆機同好會
Hi Johnny,

Any suggestion of Non-NFB tube pre amp circuit? Thanks a lot

最後修改時間: 2024-12-13 19:49:56

Ck2007

正式會員
223.xxx.xxx.244

2024-12-13 19:49

[#4738] 單端胆機同好會
I modified the ARC L25 balanced line amp to single-ended one.

It should be good for trial.

Johnny

johnnykmtang

會員
70.xxx.xxx.22

2024-12-14 00:30

[#4739] 單端胆機同好會
Johnny: 我網上搵audio note M7 線路和你的LS25簡化版, 可以畀啲意見嗎?

ck2007

正式會員
223.xxx.xxx.244

2024-12-14 11:36

[#4740] 單端胆機同好會
The AN M7 is a good performer too.

Suggest to reduce the cathode resistor from 470 to 220 ohm for lower distortion.

The gain : x 15

The 5687 plate current is 15mA. You would need 5 to 10 watts resistor.

Johnny

最後修改時間: 2024-12-14 15:56:26

johnnykmtang

會員
70.xxx.xxx.22

2024-12-14 15:47

[#4741] 單端胆機同好會
ck2007師兄，My 2 cents

如果你認同triode係零回輸係最靚声，咁就盡量用低屏阻胆或並聯幾隻胆都唔好用cathode follower (or whatever white follower etc.)，任何follower circuit都會另帶音染令中音及原本訊號微細harmonic 純度受損

單級(或並聯幾個sections)屏出係最自然最真最夠body及厚度，例如你並聯兩sections 5687，輸出阻抗已低過1k ohm, 接1 Meter inter connect cable及50k ohm 以上輸入阻抗後級夠哂力

最後修改時間: 2024-12-15 20:16:01

niceday009

正式會員
182.xxx.xxx.234

2024-12-15 20:06

[#4742] 單端胆機同好會
我相信push pull amp有其好處

不過老人家Nelson Pass 曾講過:

Nelson Pass一篇文章，佢最後結尾話，不論用胆或石，声音要最自然為目的那麼single ended 才是首選：

Regardless of the type of gain device, in systems where the utmost in natural reproduction is the goal, simple single-ended Class A circuits are the topologies of choice.

https://www.passlabs.com/technical_article/single-ended-class-a/

而實聽中，單端確實在中音段似乎有種魔力令人迷戀

最後修改時間: 2024-12-16 01:48:07

niceday009

正式會員
218.xxx.xxx.220

2024-12-16 01:39

[#4743] 單端胆機同好會
Gary Pimm Achieve web page, 發覺Gary Pimm呢個300B綫路嚴重浪費电力，用Parafeed但唔用plate choke 反而用active CCS 令到B+要1000V, 冇人傻到去砌呢個線路嘛, 如果佢做845咁就要B+ 2300V?

最後修改時間: 2024-12-20 22:47:12

niceday009

正式會員
182.xxx.xxx.33

2024-12-20 22:44

[#4744] 單端胆機同好會
The Gary Pimm's 300B is something beyond my imagination. I just can't figure out what are the benefits the circuit will bring.

johnnykmtang

會員
70.xxx.xxx.22

2024-12-21 03:14

[#4745] 單端胆機同好會
https://www.facebook.com/share/p/19SBFgmdjv/

真係第一次見。GEC 居然有出 245膽

WilliamsonAudio

正式會員
43.xxx.xxx.204

2024-12-21 07:10

[#4746] 單端胆機同好會
Gary Pimm 當年也有設計 Differential Push Pull amp , 同 Allen Wright 一樣。

Gary Pimm 電路設計功力深厚。並非傳統嘅設計理念。。當然1000V 就真係有啲誇張. 其他的設計,例如用CCS, shunt type regulator ,佢對於Current loop 也有深入嘅理解。另一個對current loop 有研究系 Lynn Olson.

最後修改時間: 2024-12-21 07:21:27

WilliamsonAudio

正式會員
43.xxx.xxx.206

2024-12-21 07:20

[#4747] 單端胆機同好會
分享改 Marantz 7 的 link

https://jeffsplace.positive-feedback.com/a-guest-article-from-mr-shirokazu-yazaki-my-adventure-with-my-old-marantz-model-7-part-6/

Yazaki-san told us about his way of modification with his Marantz Model 7, and how important the quality of the power supply is to the overall performance, because the current from the power supply turns into the signal current.

Yazaki-san described for us how the switch to the Ultra-Fast & Soft Recovery STTH6112TV2 for +B rectification improved the speed of the current from the power supply, and lowered the noise.

Yazaki-san also described for us how he likes to install a hermetically sealed oil-filled capacitor into the subsequent stage of the rectifier tube or diode, connected in parallel with the main electrolytic capacitor for rectification, and how that its addition provides a more responsive and organic sound.

最後修改時間: 2024-12-26 07:11:18

WilliamsonAudio

正式會員
182.xxx.xxx.35

2024-12-26 07:09

[#4748] 單端胆機同好會
今日應R33網友邀請，去体現佢用SUN AUDIO SV30PB 推国產三路喇叭，睇唔出此喇叭出其低音可以咁强勁，這款低音箱出孔在底部，打斜出氣將箱内共鳴低音能量帶出來

niceday009

正式會員
182.xxx.xxx.100

2024-12-27 16:07

[#4749] 單端胆機同好會
係香港好多屋企可能PSE 300B 已夠用

niceday009

正式會員
182.xxx.xxx.100

2024-12-27 16:09

[#4750] 單端胆機同好會
相信大家都知道交連电容对声音之影響，最靚之交連电容就係冇交連电容即係直結

想做到300B直結唔用交連电容朋友請留意，最近與Wilson及Johhny 探索直結得出兩種稳陣可行电路

第一種係推動級用plate choke load及分別用电源牛獨立繞組, 這电路若拔走6V6(或其他推動胆，胆內阻約2K), 300B 栅仍有栅压唔會燒300B，以下綫路是3級全直結