review33.com: 影音天地: 單端胆機同好會

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[#3763] 單端胆機同好會 #3757 呢個2nd order harmonic generator 我幾年前都係web睇過，若果加咗佢可以將部zero feedback 推挽石机变成一部大功率單端300B, 我諗 audionote 同Kondo要執有冇用過D user comments ? 最後修改時間: 2024-03-28 00:22:55		niceday009 正式會員 182.xxx.xxx.254	2024-03-28 00:20

[#3764] 單端胆機同好會
I don't think the 2nd harmonic gen is good. If it is good, they will be selling at TaoBao for sure.

Johnny

johnnykmtang

會員
70.xxx.xxx.22

2024-03-28 02:08

[#3765] 單端胆機同好會
#3763-3764

我記得結果是。複雜的音樂是會好亂。

Taobao 也有得賣。

我也不見好多人玩這個

最後修改時間: 2024-03-28 08:56:24

WilliamsonAudio

正式會員
182.xxx.xxx.243

2024-03-28 08:55

[#3766] 單端胆機同好會
Pass 大師好似至愛 2nd harmonic
睇睇點調試前級：
https://www.firstwatt.com/wp-content/uploads/2023/12/art_diy_nutube_preamp.pdf

galaxyrr

正式會員
104.xxx.xxx.130

2024-03-28 14:08

[#3767] 單端胆機同好會
PASS 總結和 ETF 04 結果是一致的.

複雜的音樂表現不好。

WilliamsonAudio

正式會員
182.xxx.xxx.243

2024-03-28 14:15

[#3768] 單端胆機同好會
見到特別設計單端胆+石機，無負回輸由电压放大級至功率級，而且極低失真，是否可取代又貴又高电压之三極胆單端機

意大利Pathos 部Twin Towers 35W合併單端石机係市場上相當特別設計，出咗好耐但之前冇乜留意，現在睇佢結構好有趣味性

佢全機只用一級單端12ax7 做电压放大，真係Simplicity & Purity 至上，最奇特係佢唔似一般胆加石設計，一般胆加石係石功率級必定是推挽OCL設計，而Pathos 就寧願做真正甲類單端經大數值电解电容出声，阿水都知用电容交連去喇叭係冇推挽OCL直接，电容出变成声音質素要依靠电容質素

Pathos 用真正單端MOSFET A類功率級仲要做隻幾A大电流大扼流圈(並非Nelson Pass SE amp 用MOSFET 做电子Constant Current), 成本更高，Pathos twin towers 石机得A類35W是相當重，兩個輸出大choke份量唔細大約兩隻500VA牛大小，同靚845單端牛咁大，Accuphase 部50W A 類只係36kG，Pathos Twin Towers 35W A類42kG，我估個大Choke 有Gap 100mH行3.5A

Pathos 全機零回輪，設計者只用一級12AX7做电压放大好聰明，而刚刚sim過，12AX7 CCS load 出50V P to P出35W class A 擺幅只有0.01%2nd order, 0.01%3rd order(200V CCS, 2mA), 失真比任何大功率單端胆机都少過100倍以上, 請記住係一級三極胆做放大，極之簡單加高純度

係一部絕對單端結構而且超低失真，是否我地成日掛住三極功率胆而忽視單端石机之更高優点？

有冇人曾經聽過？

最後修改時間: 2024-03-28 23:04:14

niceday009

正式會員
218.xxx.xxx.232

2024-03-28 22:36

[#3769] 單端胆機同好會
咁會否清D

niceday009

正式會員
218.xxx.xxx.232

2024-03-28 22:47

[#3770] 單端胆機同好會
Tube/MOSFET hybrid power amp - can it match the real DHT SE?

I don't think so. I auditioned a few single stage VFET and MOSFET power amp. They sound pretty clean and powerful but they don't have the airy and charming sound from tube SE amps.

Well, this is only my experience. Maybe there are some great sounding hybrid amps can perform much better.

Johnny

johnnykmtang

會員
70.xxx.xxx.22

2024-03-28 23:21

[#3771] 單端胆機同好會
I have not heard this Pathos twin towers.

Did you audition the push pull power stage or the real MOSFET single ended power stage. To compare to typical tube+transistor amp, this Pathos spent considerably lot of money on output choke that I do not see other soild state single ended would do. Just wonder how it sounds.

This Pathos function like a parafeed with choke but no step down transformer, I especially like its single stage 12ax7 capable of being an integrated amp

最後修改時間: 2024-03-29 00:19:33

niceday009

正式會員
218.xxx.xxx.232

2024-03-29 00:04

[#3772] 單端胆機同好會
Aries Cerat Protos

胆石合併機A類20W淨重65kg

The Protos is using the TriodeFet active element in a very different topology, as this is a Single Ended design It goes a step beyond to be the only integrated amplifier which is Single Stage as well. One stage from input to output posts.

The Protos amplifier is not only Single Ended, it is also a Single Stage! there is no driver stage and no input stage! However this is not just an amplifier but a complete integrated amplifier.That means that from the input to the speaker outputs, there is only one stage of amplification.

https://aries-cerat.com/ianus-protos-product-page/?fbclid=IwAR15u3VcMQFewZ7WGdD50RiHlrvSvEPjlBq-cmrMv9ix4e3uTfKqFg-xvSU

https://youtube.com/shorts/S4uK4SVUTBA?si=wosavnUNvY_m-9O3

mark1

正式會員
124.xxx.xxx.39

2024-03-29 01:40

[#3773] 單端胆機同好會
The configuration of the Pathos is:-
First is ECC88 gain stage. Then, the second ECC88 is cathode buffer. The signal drives the three IRF240 power MOSFET's in parallel as Source Follower. That means it is a 1:1 follower of the input signal at the Gate.

The ECC88 gain and buffer stage is straight forward that doesn't need to get in details.

I ran the simulation with Hammond 193V choke which is rated 150mH 3A. The idle current for each IRF240 set to 1A.
The max output power before clipping is 14 watts rms with 8 ohm load. The clipping occurs when the MOSFET's run into cutoff condition. Therefore, higher idle current will provide higher output power.

The damping is about 30 which is rather good for SE amp.

The power dissipation with 3A idle current would be 114 watts per channel. It gets real HOT indeed. Large heat sink or air force cooling is required to keep it warm, not hot.

p.s. I am curious what is the idle current set in the actual amp????

Johnny

最後修改時間: 2024-03-29 03:14:46

johnnykmtang

會員
70.xxx.xxx.22

2024-03-29 03:06

[#3774] 單端胆機同好會
Schematic

johnnykmtang

會員
70.xxx.xxx.22

2024-03-29 03:12

[#3775] 單端胆機同好會
36 step relay control TVC PCB 開始劃了，分三塊底板，每塊用12隻relay。

新老手

會員
203.xxx.xxx.42

2024-03-29 15:44

[#3776] 單端胆機同好會
36格，，，會唔會扭細一格又細声得滯，扭大一格又大声得滯。。。。

mark1

正式會員
124.xxx.xxx.39

2024-03-29 16:56

[#3777] 單端胆機同好會
Luxman CL1000 都係34 Step，已經係當今最細分的了，市面普遍的電阻式步進電位器，由22 step~24 step.
36 檔TVC如果成功，目前是最密步了，可以正常走A型對數式Volume曲線。

新老手

會員
203.xxx.xxx.42

2024-03-29 17:24

[#3778] 單端胆機同好會
電阻式，，，cello係59 step。。。#3772嗰部Aries Cerat Protos合併机係61 step。。。

mark1

正式會員
124.xxx.xxx.39

2024-03-29 17:34

[#3779] 單端胆機同好會
Nagra有部前級都係用TVC。。。係每step 0.5dB衰減，，，36 step即係每step多少dB。。。

mark1

正式會員
124.xxx.xxx.39

2024-03-29 17:41

[#3780] 單端胆機同好會
#3778，市面上一般DiYer能買到的普遍是22~24Step，至於其他的有大步數的，我不便評論，因為有個别是用無段式VR(即普通的VR)，但用機械管位做出幾拾格的感覺而已，真心不敢指名。
當步級數多與小，可令每步的db增程不同，舉例，如果以一般從-50db~0db，有25檔，如行B型曲線，則可以每步2db分進，如果檔數多，則可以少于每步2db，這是以B型綫性曲線而言，但真正的音量控制曲線是應該行A型對數式曲線，即前三分二行小db增程，後三分一行大步增程。但最後的每步增程，人人的要求有異的，不能一概而論。

新老手

會員
203.xxx.xxx.42

2024-03-29 18:03