极品人生

标题: 请教关于cello P 101 唱放卡 [打印本页]

作者: 清兵 时间: 2013-2-11 08:56
标题: 请教关于cello P 101 唱放卡
本帖最后由清兵于 2013-2-11 09:02 编辑

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等待两年，终于在过年前两天收到了cello P101 Mc 唱放卡。
这个卡的素质是有争议的，很多人说他不好，也有人说很好。
据说很难匹配唱头。说明书我没法找到，只在论坛上找到P101唱放卡的设计者Tom给用户的回信。因为英文水平不过关，黑胶水平更不过关，所以只能大大概概看出来说P101输入阻抗为1000欧，并且推荐用一个前前级，但是又说这个很难找到合适。哪位英文好的黑社会大佬帮忙解释一下子？小弟先鸣谢鸟。

RE: P101 and MPS

From: Tom Colangelo
dated Wed, Apr 5, 2006 at 8:58 PM

Dear Jonathan, I would use the transformer in your particular case. The problem is finding one. Due to the the minute signal levels involved requires a very well shielded transformer.The nominal input impedance (" Z ") of the P-101 is about 1k Ohm. This is shunted with a .03 micro Farad capacitor. This will require modification of your P-101 to use a typical step-up transformer. With the present input "Z" of the P101 would need a transformer with an output "Z" of of 1k Ohm or less. A transformer with an output "Z" of 1k and an input "Z" of 10 Ohms would provide 20dB (10X voltage "gain" would work well. FYI: The "Z" ratio is equal the square of the turns ratio or the voltage ratio. For example transformer with with an output "Z" of 600 Ohms and an input "Z" of 6 Ohms would provide a voltage step-up of 10X and have a turns ratio of 10X. Another possibility is to use a pre-pre that has a gain settings of 12dB, 20dB, and higher. It is difficult to find such devices because most transformers and pre-pre(s) were designed to be interfaced with moving magnet phonon designs and as a result provide a large amount of gain. There may be some transformers that will work because the 1k input (z) of the P-101will help reduce the output enough to provide to bring the output level near to the point desired.

作者: sm163 时间: 2013-2-11 11:08
清兵兄准备入黑了

作者: 清兵 时间: 2013-2-11 11:35

清兵兄准备入黑了
sm163 发表于 2013-2-11 11:08

黑是早就入了，不过是最低端的，放卧室听听小曲儿。

作者: sm163 时间: 2013-2-11 11:52

黑是早就入了，不过是最低端的，放卧室听听小曲儿。
清兵发表于 2013-2-11 11:35

哈！LP可玩性高，现在是想把cello前级的唱放功能用上？

作者: 清兵 时间: 2013-2-11 12:10
是啊。现在有齐mm和mc唱放，打算搞个单声道一个立体声，哈哈。打算先从唱头开始配。

作者: 牛仔 时间: 2013-2-11 12:10
讲的是升压牛与P1O1的一些关系

作者: 清兵 时间: 2013-2-11 12:35
牛教授请指教。

作者: rock 时间: 2013-2-11 13:17
大概意思是要使用P01 ,要么选择一个阻抗匹配器(输出阻抗<1K),要么使用前-前级(增益 12-20DB,或更高) , 但两者都很难找到,因为多数阻抗匹配器和前-前级都是为MM唱头设计的.
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我觉得这个设计师也许不知道目前很多前-前级(升压牛)都是为MC头设计的,只要找到一款升压牛,符合以下几点:1.其输入阻抗与你使用的唱头输出阻抗匹配 2. 输出阻抗与P101 匹配( <1K) 3 .增益12-20DB .这样,在理论上,你的P101 卡就可以用了.

另外,这个P101 也是为MC头设计的, 不知道增益是多少,除非增益比较低,否则应该可以直接装上MC 头啊...

作者: 清兵 时间: 2013-2-11 13:26
谢谢rock!我的英文太烂了。真没想到老大对黑胶问题很了解啊。一直就见您聊丹拿聊ML，很少提黑胶，深藏不露啊。佩服佩服！真的佩服！

作者: rover 时间: 2013-2-11 13:32
没露的多着呢！黑社会好啊！

作者: MJL988 时间: 2013-2-11 15:11

没露的多着呢！黑社会好啊！
rover 发表于 2013-2-11 13:32

就是，要想入黑社会，一定不能忘了请教rover兄啊！

作者: rover 时间: 2013-2-11 15:28
回复 MJL988 的帖子

哪里啊！坛里黑鱼多的是呢！

作者: newbjman 时间: 2013-2-18 12:08
清兵兄
我猜发信给Tom是问及如何将P101和他的唱头匹配。相信一定是低增益的一类。

Tom 的看法是采用变压器，但这变压器不好找。原因有二：在极低讯号下，变压器需要极佳的屏蔽。P101的输入抗阻是大约1K，輸出端再並联0.03 mf 电容。假如用普通的升壓牛就要改变P101的缐路。用P101你選用的升压牛的抗阻要在1K以下。用这个来举例，你的升压牛的输入抗阻就要 10ohm 才有20db人增益。

另一方法是用前前级，有12db，20db或更高增益。

两者都不容易找到。大部分这些设计都和系统的动磁整合，每每增益太大。

不过还是有些升压牛还是可以发挥，P101的1K抗阻会把讯号减弱，因此达到所需电平。

Dear Jonathan, I would use the transformer in your particular case. The problem is finding one. Due to the the minute signal levels involved requires a very well shielded transformer.The nominal input impedance (" Z ") of the P-101 is about 1k Ohm. This is shunted with a .03 micro Farad capacitor. This will require modification of your P-101 to use a typical step-up transformer. With the present input "Z" of the P101 would need a transformer with an output "Z" of of 1k Ohm or less. A transformer with an output "Z" of 1k and an input "Z" of 10 Ohms would provide 20dB (10X voltage "gain" would work well. FYI: The "Z" ratio is equal the square of the turns ratio or the voltage ratio. For example transformer with with an output "Z" of 600 Ohms and an input "Z" of 6 Ohms would provide a voltage step-up of 10X and have a turns ratio of 10X. Another possibility is to use a pre-pre that has a gain settings of 12dB, 20dB, and higher. It is difficult to find such devices because most transformers and pre-pre(s) were designed to be interfaced with moving magnet phonon designs and as a result provide a large amount of gain. There may be some transformers that will work because the 1k input (z) of the P-101will help reduce the output enough to provide to bring the output level near to the point desired.

我相信关键是动圈唱头的增益。

作者: 清兵 时间: 2013-2-18 13:00

清兵兄
我猜发信给Tom是问及如何将P101和他的唱头匹配。相信一定是低增益的一类。

Tom 的看法是采用变压 ...
newbjman 发表于 2013-2-18 12:08

太感谢老大了。这个101卡，用家真是投诉不少。因为阻抗不可调，所以唱头难匹配，选择的余地非常有限。很多用家都是磨改了内部电路。邝大侠不知是否还在使用cello

作者: 清兵 时间: 2013-2-18 14:38

清兵兄
我猜发信给Tom是问及如何将P101和他的唱头匹配。相信一定是低增益的一类。

Tom 的看法是采用变压 ...
newbjman 发表于 2013-2-18 12:08

有cello玩家曾经提示唱头增益要大于0.5才有较好动态，所以有许多低增益的好唱头都难以匹配，比如范登豪的小鸟。有不少对cello唱放又爱又恨的玩家最后宁愿去找p100mm唱放

作者: 清兵 时间: 2013-2-18 14:40

清兵兄
我猜发信给Tom是问及如何将P101和他的唱头匹配。相信一定是低增益的一类。

Tom 的看法是采用变压 ...
newbjman 发表于 2013-2-18 12:08

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