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T版最近折腾的电池前级能否介绍一下,学习一下。

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我最近也在调整自己的系统。
用cello的箱子组建了多声道,闲着也是闲着。利用主箱顺便操练一套立体声系统玩玩。
cello的箱子搞三分频是没问题的。
现在逐渐解决的设备如下:
解码:WEISS DAC2
前级:谋划ing
后级:STUDER A68 ×2

对T版搞的前有些印象但现在比较模糊了,所以出来直接请教一下


回复 1# hornspeaker

老兄好,前级,audio consulting的确有电池版,请参考:
SWGLASilver Wire Gain Line Amplifier
Imagine a line preamplifier using a silver wire transformer volume control achieving very low output impedance together with a gain of 10dB...

Features:
  • Battery driven, feed back free and unity gain solid state devices as transformer drivers
  • Maximum 50 Ohms output impedance
  • Very low idle power dissipation
  • No heat sink
  • Battery power
  • High speed electrolytics as power supply by-passes
  • Eichmann PhonoPod RCA Socket
  • 3 switchable inputs
  • Phase switch
  • Wooden chassis
  • Custom features upon request
  • Price: CHF 14'500.00 Lacquered Black MDF Chassis
  • Price: CHF 17'500.00 Maple-Palisander Veneered Natural Wood Chassis

[url=http://www.audio-consulting.ch/?Productsreamlifier:SWGLA]http://www.audio-consulting.ch/?Productsreamlifier:SWGLA[/url]
swgla1_450.jpg

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回复 1# hornspeaker

我玩的其实是被动牛前级,虽然是silver rock版本,估计是3年前的产品,但是买的是韩国代理的展示品。
新的被动牛前级介绍如下:
Silver Rock TVCPassive Transformer Volume Controll

The use of resistive elements for volume control leads to major sound deterioration !
First we would like to explain our general philosophy :
There always is one optimum for a given problem. It costs tremendous amounts of time to find it, but this is the only way to make real progress. If you want a cheap solution for your potentiometer in your sound system, then use carbon pots.
They are more neutral than the expensive plastic ones and of course much cheaper.
If however you want the best possible solution to your potentiometer problem, then you should try our silver wired transformer - potentiometer that really is a world apart from other volume setting devices.
Some years ago, when we still were believing that we can achieve good sound with conventional potentiometers, we made a 100 Kohms 24 position stepped potentiometer using Tantalum resistors. This was a lot of work and we were proud of it.
We wanted to see how much better it was comparing it to a surplus graphite type pot.
Even if it was very difficult to admit, the graphite type was better sounding and we decided that we need some fundamental research to be performed.
The first trials with transformer based systems were rather successful and we went on into that direction ending up with custom made iron as well as custom made silver wire.
This potentiometer clearly shows that it is useless to expect resistive systems to perform without major sound deterioration.
One should keep in mind, that a conventional 100 KOhms potentiometer, when set at medium position, places a 50 kOhms resistor in series with the signal.
With a 300pF cable or input capacitance, this situation leads to an attenuation of - 3 dB at 11 Khz.
The lower you go with the volume setting, the narrower the bandwidth becomes right in the audio band !
One finally understands why at low levels our audio systems sound so bad.
With a transformer - potentiometer you have the opposite situation. The lower you go with the volume, the lower the output impedance of you system becomes and the wider the bandwidth.
Besides bandwidth problems, we have noticed that putting resistors in series with the sound signal always results in dynamic constriction and loss of details.
On top of that, a transformer enables the discontinuity of grounds, which helps to keep RF and LF noise as low as possible.

Features:
  • Transformer with 24 logarithmically set up secondary windings
  • +6 dB gain version available
  • 3 switchable inputs
  • Silver wire coils
  • Very exotic magnetics
  • Very special winding techniques to achieve optimal filling characteristics and low losses
  • Very special assembling techniques
  • Distorsion: almost unmeasurable at all frequencies

Prices:
  • Black MDF cabinet: CHF 8.600
  • Veneered natural wood: CHF 11.600
  • Add CHF 1.150 for absolute phase switch
SilverRockTVC300.jpg

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如果你想试听被动牛前级,我可以拿给你玩两个小时 :)

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多谢多谢了

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可怜我的英文水平。
可恨Ť版不翻译就发上来了。


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软件翻译T版内容,

本帖最后由 MC225 于 2010-1-20 10:11 编辑

电阻元件的音量控制使用造成重大的健康恶化!
首先,我们想解释的一般原则:
一直是有一个给定的问题最优。它花费了大量的时间来找到它,但这是唯一途径,取得真正的进展。如果您想为您在您的音响系统电位廉价的解决方案,然后使用碳盆。
他们更中立的比塑料的成本,当然要便宜得多。
然而,如果你想要最好的可能的解决方案您的电位器的问题,那么你应该尝试我们的银有线变压器 - 电位这确是一个世界其他卷外,设置设备。
几年前,当我们仍然相信,我们都可以达到与传统的电位器良好的声音,我们发了100 k欧姆24位置加强钽电阻电位器使用。这是大量的工作,我们对此感到自豪。
我们想知道如何更好地比较,它是有盈余的石墨型锅。
即使是很困难的承认,石墨型好漂亮,我们决定,我们需要一些基础研究,要执行。
与变压器系统的第一次试验是比较成功的,我们将继续与自定义,结束了方向作出铁以及定制银线。
这清楚地表明,电位是没用的,预计电阻系统在没有任何重大的声音恶化。
人们应该记住,一个传统的100 k欧姆电位器,当中等位置设置,地方与信号系列50欧姆的电阻。
随着300pF电缆或输入电容,这种情况导致了衰减 - 在11 kHz的3分贝。
你越低的音量设置去,成为较窄的权利在音频频带的带宽!
一终于明白为什么在我们的音响系统的音质这么差水平低。
随着变压器 - 电位您有相反的情况。你越低,销量与越低,你的输出阻抗系统变得和更广泛的带宽。
此外带宽问题,我们注意到,在与声音信号的动态收缩总是和细节损失将电阻一系列成果。
在最重要的是,一个变压器使理由不连续,这有助于保持射频和LF尽可能低噪音。

特点:
对数的24变压器次级绕组成立
+6 dB增益可用版本
3切换输入
银线线圈
非常奇特磁
非常特殊的缠绕技术,以实现最佳的填充特性和低损失
非常特殊的组装技术
畸变:几乎在所有频率不可测

价格:
黑色中密度纤维板柜:瑞士法郎8.600
天然木贴面:瑞士法郎11.600
添加绝对相位开关瑞士法郎1.150
  
SilverRockTVC300.jpg(35.38单位:kB)

下载次数:0

7小时前

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电阻元件的音量控制使用造成重大的健康恶化
首先,我们想解释的一般原则:
一直是有一个给定的问题最 ...
MC225 发表于 2010-1-20 10:00



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价值2千多的垃圾前级,吹2下就变成2万多了。

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回复 9# 胆大包地


    反正tango没有,嘿嘿。

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