唱頭輸出細的解决方法

t93288

想謝教大師们一個问题，如果唱頭(MC)只夯0.24mv. 唱放增益是62db,应該唔多夠声。冇甚麽辦法可解决呢？？

前级可加大6db gain, 是否等同唱放的增益，定係加升壓牛？定係唔好搞咁多嘢，換個大啲輸出的唱頭呢？

racewong

你部EAR唔只62db喎

racewong

解決方法當然係玩牛牛啦

t93288

racewong 發表於 2022-11-5 16:51
你部EAR唔只62db喎

我指另一部primary r32. 相对我喜欢這部phono 聲多啲，EAR 是厚暖些少，但少咗啲HiFi 原素，試過另一phasemation 入门的,phono 都唔錯。

平平地升壓牛有乜選擇？？唔好貴過粒頭啦，否則换頭啦

再者，想问问鎗王板主，而家支wtb370 (rega)臂想換，FR064fx 或SAEC 308 可以嗎？

S6410

上杉牛!

racewong

t93288 發表於 2022-11-5 17:34
我指另一部primary r32. 相对我喜欢這部phono 聲多啲，EAR 是厚暖些少，但少咗啲HiFi 原素，試過另一phas ...

我有隻SHELTER牛無用, 如果你想試可以上黎搵我, 我借比你返屋企試.

wilmerworkshop

可以前級加 gain 試咗先，其實唱放係上代產物，規格上未有改朝換代，佢嘅放大率係建基在前級係 10 倍放大（20dB），但係自從 digital 開始因為默認有 2V 或以上電平俾前級，好多前級已經唔需要 10 倍放大，加上低效率喇叭嘅出現，所以拖低咗系統整體增益。

如果前級係足 10 倍放大，加上假設喇叭係接近 90dB，你部唱放係應該夠 gain，所以前級可以加 gain，不妨先試。

racewong

wilmerworkshop 發表於 2022-11-7 12:11
可以前級加 gain 試咗先，其實唱放係上代產物，規格上未有改朝換代，佢嘅放大率係建基在前級係 10 倍放大（ ...

好多前級都無得加GAIN{:5_456:}

t93288

My Pre-amp can add 6db gain. But the performance is just.....  less 3D feeling and dynamic. I had bought the Phasemation SUT, will try it tonight... thanks

jules

如果你係用一部十倍放大前級，62db gain phono 俾0.2mV  唱頭 應該足夠

jules

你 phono set 幾多ohm 阻抗？

t93288

jules 發表於 2022-11-7 18:40
你 phono set 幾多ohm 阻抗？

Set 咗100 ohm

wilmerworkshop

t93288 發表於 2022-11-7 20:22
Set 咗100 ohm

其實可以試其他阻抗，MC 嘅 loading 阻抗越高，高頻上得越盡，相反越低越冇高音，如果唱頭建議 100ohm，你可以試 2xx、3xx 什至 4xx，試到啱聽又唔太標為止

t93288

wilmerworkshop 發表於 2022-11-8 01:47
其實可以試其他阻抗，MC 嘅 loading 阻抗越高，高頻上得越盡，相反越低越冇高音，如果唱頭建議 100ohm， ...

Thank you.,

天下第一刀

如果前級系膽直接用JT-115K-E 1:10 STEP-UP FOR HIGH IMPEDANCE AMPLIFIERS﹐
其他在此﹕
https://www.jensen-transformers.com/transformers/mic-input/
如果系1﹕2合適,那麼用JENSEN JT-123-BMCF 80% nickel laminations 高音非常好.
在用便宜JT-123-FLPCH 50% nickel laminations:
(JENSEN如在Hong Kong有代理﹐記得牛要左右聲道配對﹐同批牛都相差很大。)

SHURE 幾十年前舊MIC拆出來的牛同樣暖聲

SHURE 90M2150:

t93288

Thank you, but I don't know electronic and may not have ability to make it DIY.

t93288

I had added the Phasemation T-300 SUT, the sound quality is significant improved. but there is 'humming' sound appear when idle. I had replace the phono cable for SUT to pre-amp already, still have low frequent sound when idle. How can I do?

t93288

加咗只phasemation 升壓牛，加多條銀phono 線，是好声咗，但humming 佔頻声仲有，点搞好？？？？

vincenthoy28

Try the following:

- Try to place your phasemation 升壓牛 to different location (away from your amp as well...) Some external interference may inducted to the transformer

- Try another interconnection cable between your transformer / pre-amp. Some cable may not suitable for the connection between transfomer / pre-amp

t93288

vincenthoy28 發表於 2022-11-25 14:34
Try the following:

- Try to place your phasemation 升壓牛 to different location (away from your amp ...

Thank you 師兄，之前只升壓牛放在後級同电處中间，聽師講完，·搬返出來，完全解决了，冇哂｀hum声｀啦!真神奇，煩腦咗成個几星期，而家靜哂。{:5_454:}