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01、物品种类：MC升压牛02、品牌和型号：Nagra-Kudelski 升压牛
03、机身序列号：***
04、物品来源二手
05、物品所在地：上海
06、工作电压：无源
07、外观成色：极新）
08、内部成色：很新
09、修摩情况：无修无
10、工作状况：极
11、物品缺陷：无
12、物品价值：5000元
13、包装形式：提供快递纸盒
14、运输方式：货运/快递/EMS等
15、运费：货到付款
16、置换方式：无
17、置换保障：不包
18、中介与否：否
19、联系方式：王先生 13901697361（若买家通过电话或者QQ与卖家确定了置换的话，请发帖置换当事人跟帖注明且封贴，避免纷争）
20、特别说明：置换收货时尽可能当着物流的面开箱验货，如有问题当场拍照证明，分清责任，也利于向物流索赔
Very rare matched pair of vintage MC phono step-up input transformers from Kudelski S.A. - the famous European manufacture of professional audio equipment with trademark Nagra
These transformers were used in broadcast studio as universally portable step-up input transformers for dynamic microphone and record players with MC phono pick-up, special to serially connecting with the transmission cables.
Because of an excellent transmission performance, they are really perfect to application with MC phono cartridges, as well with low and high output impedance.
In originally they were used with 20 dB step-up rate only. I prepared these transformers, especially for use as MC Phono step-up input transformers with optional variable step-up rate of 20 dB and 25 dB
These transformers have two separate input coils, which can be connected in two options - parallel or serial . Inside is a little slide switch for switching between these two options.
With the first option ( parallel connection) with unloaded output the ratio is 1:30 (29dB)
With the second option (serial connection) with unloaded output the ratio is 1:15 (23dB)
In case of a connection with the MM input (typically input resistance about 50 kOhm) the output is loaded with a resistance about 50 kOhm. In this application with the first option the real ratio is 1:20 with step-up rate 25dB, and in the second option the real ratio is 1:10 with step-up rate 20dB
I tested these transformers with a special MC Phantom with adjustable output impedance, with a sinus signal in the frequency range from 10 Hz to 20 kHz, with output (source) impedance in the range from 2 Ohm to 40 Ohm.
These transformers really have absolutely exceptional transmission parameters.
The frequency transmissions rate is perfectly linear in the entire impedance range from 2 to 40 Ohm.
from 10 Hz to 20 kHz really +/- 0dB!!
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发表于 2013-11-14 10:42:50
楼主