这是止此牛的制作人的评论,各位看有道理吗:
The amorphous material is very interesting. But there are several problems of it. The first is that its magnetic induction is very low, only about 1.2-1.4T.
Thus there is the need to use bigger cores than on regular silicon steel,which holds 1.7-2T.(You may see on Ebay ,that the 6,2kG OPTs work only with 85mA bias current ) The second problem is the cost of the material. Even the Chine's products are very expensive for me. I just must pay for shipping and then also customs taxes.
I try the material ,because of its very low level of core loses , they are only 0.2-0.4 W/kg. Meantime the HiB ( 0,23mm) has 0,9W/kg.
About the sound of amorphous , a can not tell you much more. I only may agree with the people who claim that amorphous' sound is biased towards Low Frequency.
The sound is different from HiB, which may be considered more "airy", but on many kinds of music I would prefer the very amorphous OPT.
But in your case ,with High Voltage Triodes , you have no choice , The size and price of such good pair of amorphous will be of very big level. Of course In my humble opinion!!!

The core air gap is chosen for DC current 85mA and generates a no signal core flux density of 0.6Tesla. So it leaves a flux density swing of 0.6Tesla for the signal.
The max. primary signal at 20Hz may be 250Volt R.M.S.

Thus the transformers may work, on maximum power, with 300B up to 15-20Hz Low Freq.
The capacity between the primary and secondary coils is about 1740pF

Primari impedance 4,8Khom to 8ohm
Primary coil resistance 64ohm
Inductance is about 38H for the bias current 85mA , (checked through an electrical outlet -50Hz).
Frequency characteristic: 15Hz-45Khz -3dB . It is checked on tube amplifier 6AG7 and GU50 , with maximum power.

Quality of insulation : is more then 20Gohm checked with a megger 2500V ,during 1 minute .
The insulation material is Mylar,which allows to make High Frequency Transformers!
The weight of each device is about 6,3Kg!!!

睇吓你出乜精, sorry 晶



最後修改時間: 2014-02-18 14:09:34

Nanocrystalline Core is better than the Amorphous Core. And also the size is smaller than Amorphous Core.

We can see the factory data.

http://www.gredmann.com/1div/productf.htm

niceday, thank you for your explaination.

amphrous core has charateristic of being more easily saturated with given same quantity of magnetic flux. Although it has much higher perability, for SE application for a given power output, it requires a tad bit bigger size than usual silicon steel like M6 or M4, the paradox is amphrous can get higher inductance with a given same wire turns but require a bit bigger core in size to sustain the power output

In term of listening experience, Amphrous core is significantly better in dynamic response

最後修改時間: 2014-02-18 14:01:29

#12 wonderful sharing !!!


#14 選用了非晶合金，所以牛体積比列較大
Usually bigger size for larger power; better material, smaller core size (same power). Do you mean 非晶合金 is not good and has to be bigger size for the same amount of power?

最後修改時間: 2014-02-18 10:01:41

它選用了非晶合金，所以牛体積比列較大，並非大村而小用！

Good point, niceday ching

最後修改時間: 2014-02-17 23:25:57

size of output core depend on

1. SE or PP, SE need air gap which greatly reduce the
inductance needed for AC transformer to operate, more DC standing current flow through SE transformer, the bigger gap it need and lesser inductance it become

2. The type of core, higher magnetic perability core material (such as silicon steel ＜ permoalloy ＜ Amphrous)，higher magnetic flux material can be smaller in size as to achieve the same inductance needed by AC operation

3. targeted output power, pp or se

Normally the bigger core of same type of material such as silicon steel can result in better bass response, deeper bass response too

I used to design output transformer for my own hobby

航空插試牛?

Signal gen + meter 快靚正

#7.
好靚仔！
但 power loss 咪好犀利囉？？！！

水兄，未試呀。刚買了這航空插回來用來試牛！

Micheal兄，對牛幾靚仔。效果如何?

我比PX4(3W)用。6.2KG/pc.

淘寶網好多細功率牛

可以,如果你唔怕磁化, 以前D收音機隻output都好細

#3.
那麼如果用耐磁化的輸出牛咪可以用細功率牛？

因為single end磁力是單向行,鐵蕊細好易磁化,所以要用大幾倍.
push pull就冇此題

可能人地買唔到咁細牛呢