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[#227] 無源前級 Transformer Volume Control preamp    
#224
中間可用金屬片間開佢
我D机有需要時會剪銅片包住D牛
伊雲士
個人訊息 正式會員
14.xxx.xxx.60
2024-11-12 13:21
[#226] 無源前級 Transformer Volume Control preamp    
#222 我用了幾年呢間 icon4Pro full balance input output
https://www.passivepreamp.com/
https://www.hiendy.com/hififorum/forum.php?mod=viewthread&tid=136965

當年新機賣兩皮幾港紙,现在........
PhantomGTR
個人訊息 正式會員
158.xxx.xxx.231
2024-11-12 12:19
[#225] 無源前級 Transformer Volume Control preamp    
方向需要如下擺放,否則造成互相干擾!

LaLaLam
個人訊息 會員
42.xxx.xxx.5
2024-11-08 11:42
[#224] 無源前級 Transformer Volume Control preamp    
想請教各位ching, 這兩隻火牛擺放位置會否太近?磁場會否影響對方?

吾該晒各位!

cj8437
個人訊息 正式會員
49.xxx.xxx.75
2024-11-08 09:48
[#223] 無源前級 Transformer Volume Control preamp    
#222
I was using the preamp/ volume control of the DAC (Audiolab MDAC+).
Then I added a Hattor The Big passive preamp 10k pot with AMRG resistors found the soundstage was larger and could hear more nuances.
One issue with the resistor based passive preamp is the potential impedance mismatch with your power amp ( in my case, a pair of active speakers with 10kohm) resulting in rolling off the high frequencies.
I then added a Jensen 2:1 step down transformer after the preamp to lower the output impedance of the preamp.
Some argue with the step down transformer I am not achieving unity gain even at max volume but I never listened to max volume and the DAC output is 6V and Zout is 3ohm so more than enough to drive.
With the Hattor you can add an active stage with +3, +6, +9db of gain.
With the active stage engaged the music is more intimate, forward and dynamic.
In passive mode the soundstage is larger, more recessed and relaxed.
I prefer the passive mode.

Build quality is superb and comes with a separate LPS.

I do want to try a TVC as it does not have the impedance mismatch issue.
The output Z goes up and down as the volume.
MichaelWittmann
個人訊息 會員
220.xxx.xxx.51
2024-09-27 09:08
[#222] 無源前級 Transformer Volume Control preamp    
定話有玩開無源前級嘅師兄分享一下你嗰部無源前級嘅資料。

最後修改時間: 2024-09-26 09:33:32
cj8437
個人訊息 正式會員
49.xxx.xxx.253
2024-09-26 09:21
[#221] Transformer Volume Control preamp    
我都不太明白

吾好意思, 因不太懂電子零件的關係, 想請問各位ching, 無源前級究竟有那幾款?
cj8437
個人訊息 正式會員
49.xxx.xxx.104
2024-09-25 11:36
[#220] Transformer Volume Control preamp    
師兄,唔係好明可否講解下嗎?
italjet180
個人訊息 會員
223.xxx.xxx.201
2024-09-25 05:19
[#219] Transformer Volume Control preamp    
真正嘅TVC 應該係用selector 做stepping 而唔係用VR做嘅。 同埋成本高好多。

ddlkh
個人訊息 正式會員
112.xxx.xxx.21
2024-09-24 15:35
[#218] Transformer Volume Control preamp TVC    
#217,呢部機並非TVC,佢係用一個600:60k升壓牛後再加一個步進電阻volume,音色改變衹因為升壓牛的600與音源阻抗匹配下做成。
新老手
個人訊息 會員
124.xxx.xxx.53
2024-09-21 08:20
[#217] Transformer Volume Control preamp TVC    
睇到因為tvc無源前級而放棄部馬七同FM266, 膽粗粗就淘咗部cheap cheap tvc無源前級, 點知一野就ko咗我部收音機姨媽五。

cj8437
個人訊息 正式會員
49.xxx.xxx.241
2024-09-20 12:27
[#216] Transformer Volume Control preamp TVC    
# 214
DR Chan
請問完成後效果如何? Thx
Nr990
個人訊息 會員
61.xxx.xxx.230
2018-04-23 18:44
[#215] Transformer Volume Control preamp TVC    
https://item.taobao.com/item.htm?spm=a312a.7700824.w4004-15769521358.4.5e964c90f44MLs&id=521868952650

n19137
個人訊息 正式會員
61.xxx.xxx.190
2018-02-28 12:53
[#214] Transformer Volume Control preamp TVC    
Proposed schematic wiring diagram

Previous DIY TVC fail due to separate preliminary and secondary windings, this time try to use autotransformer windings which has been used by other famous manufacturer. There should be some reasons.



最後修改時間: 2018-02-28 11:58:30
billchan3388
個人訊息 會員
180.xxx.xxx.3
2018-02-28 11:53
[#213] Transformer Volume Control preamp TVC    
This casing will be used as the preamp chassis.

billchan3388
個人訊息 會員
180.xxx.xxx.3
2018-02-28 11:19
[#212] Transformer Volume Control preamp TVC    
This 4 x 33 ALP switch will be used as volume control selector

billchan3388
個人訊息 會員
180.xxx.xxx.3
2018-02-28 11:18
[#211] Transformer Volume Control preamp TVC    
Just found four double C audio autotransformer designed for transformer volume control, will start to DIY a full balance preamp after sleeped for three years.

Insist no power supply, no resistor nor capacitor through out the whole preamp circuit.

Hope to get a very good sound quality with these.



最後修改時間: 2018-02-28 11:07:59
billchan3388
個人訊息 會員
180.xxx.xxx.3
2018-02-28 11:04
[#210] Transformer Volume Control preamp    
#209
鈹鏌合金牛是600:600嗎?
最好能測量兩隻牛相加的頻譜傳輸特性,以免由心理因素主導結果。

最後修改時間: 2016-08-11 00:29:24
阿福
個人訊息 正式會員
42.xxx.xxx.89
2016-08-11 00:25
[#209] Transformer Volume Control preamp    
最近用左一對鈹鏌合金做了部無源前級的輸入音頻隔離牛

再用一隻台灣名掦牛音量制控制輸出音量

效果非常好

XLR 入

RCA 出

sgoc
個人訊息 會員
124.xxx.xxx.38
2016-08-10 18:34
[#208] Transformer Volume Control preamp    
請問有無地方可以試聽到名揚前級?
darkfrank
個人訊息 正式會員
58.xxx.xxx.74
2016-03-08 15:05
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