Niceday009,

Power supply for 845 filament 10V 3.25A??? The one I use is a DC switching regulator board with rated for 10A. Both output voltage and current limit can be adjusted. So, I set it to 10V 3.25A.

By the way, I use DC switching regulator for 300B filament too.

Johnny

回應#2913
Audio Note 沒有用非晶合金，也許是它選擇矽鋼及鎳合金可以满足它的產品。
我相信使用鎳合金就不必選擇非晶合金。然而镍合金貴不並普及。能普及是Hi-B C core,下面照片中第六行最左邊那對正是Audio Note Hi-B C core outzput 牛。第五行有Tamura F人5000係列非晶合金及F7000係列鎳合金。表現都比Audio Note Hi-B好。
所以不代表AN不選擇非晶合金就說明非晶合金不好。
而非晶合金相比鎳合金性價比高很多。所以目前仍然有非晶合金output 在生產。

#2917,

Are you using SS shunt regulator ot tube based

I have a BAT 6H30 preamp utilizing 6DJ8 as B+ shunt regulator, Dynamic is fantastic

I have been wondering how to implement shunt regulation on 845 Filament with SS as 845 takes 3.25A it is better to use shunt type regulation

Shunt regulator to replace the RC cathode self bias circuit for SE tubes.

Recently I modified some of my amps having the shunt regulator to replace the RC at power tube, driver tube and for the line amp stages too. The regulator has a trim pot for the shunt voltage adjustment. I can fine tune the bias at each stage.

Using the shunt regulator has sonic improvement which like clearing the fog over the scene.

My friends tried this and amazed how good it is.

Johnny

Thanks for the invitation from NiceDay009 joining this SE club.

I am glad to learn he is a very knowledgeable guy in design and building of tube amps and transformers as well.

Building tube amps is my hobby for some years. I used to buy the transformers from Lundahl and Monolith.

My approach in design of tube amp is:-

1. Simple is the best. Better with less stages.
2. Fine tune each stage with minimum distortion with maximum required output voltage.

Recently, I modified my 300B SE with ECC88 differential push pull interstage transformer dirve. The drive output has very low distortion clean signal. The distortion primarily happens with the 300B tube itself.

Johnny
Facebook group : vancouverdiyaudio

三分體獨立電源不錯的安排。

我以前在日本買過一對PT15 胆單端胆機。PT15 好少人玩所以吾貴。

#2912

廠方有新version nano Crystalline B max 1.8 Tesla, 跟GOSS 一樣已經唔再係問題，問題剩返係新品種nano Crystalline 好貴

指標好是否声音同樣好，有一則回應

有位多倫多朋友OPT 由Z11 5kg 211牛改用7kg Double C Core Amorphous 牛，動態及清晰度明顯高好多，但係佢話少咗牛味，呢種牛味以我所知的理解係Amorphous 其磁矯力更好更低而做成殘餘交流能量更少，声尾少D，所以正規Hi B矽鋼片有佢嘅粉絲，亦都係英國Audionote從來唔用Amorphous 之原因

最後修改時間: 2023-11-25 21:36:41

#2908
Niceday兄，如果用nano-Crystalline牛芯要大40%或以上，咁樣會唔會因而令到繞多了綫，一來一回又抵消了這種芯的本來優點呢？

最後修改時間: 2023-11-25 20:22:56

請同好睇下Wave length 老板点講

https://www.stereophile.com/interviews/196rankin/index.html

My ultimate 845 single update

The chassis has been just produced，soild 6061 8mm aluminum under CNC machining, high cost, waiting for further electroplating



最後修改時間: 2023-11-23 23:01:27

多謝 wcw12 同 niceday009 的意見,謝謝

可能係之前有但我最近先睇到

我週不時强調Amorphous 非晶芯超高導磁率及殘余电能超低而使声音高動態及高分析力(高音細緻度特別明顯)，但非晶芯或Nano Crystalline 有個缺點係佢磁飽和点較冷軋矽鋼片低，只有1.1 Tesla, 而Z11 有1. 8 有D GOSS 去到2.3，所以做相同單端輸出功率非晶芯要体積大40% 至 60%

今日朋友發我新data，新CoFe Amorphous/Nano Crystalline 去到1.8T, 不過要賣成85 USD per kg, 而且要批量，Z11只係賣8 USD per kg, 不過想試下新Nano Crystalline 做ITC, 聽講有R33朋友買到小量去做interstage ，可否PM 我



最後修改時間: 2023-09-06 00:53:22

#2095

用300B 開机冇211或845咁大电流沖擊，但如果你錫胆你可以買板delay board去延高压, 淘宝有售

買一個獨立燈丝牛供應整流胆燈丝。
相中牛在r33 二手市場上正在出售中。

請教一下各位ching高手, 目前我的後級是Single Ended 300B, 每邊用1支整流+1支300B, 可使用274, 5Z3, 5U4, 等等一類整流膽, 現在手上有幾支西電301A 的整流膽.

301A 整流膽的資料如下: 301A是汞整流管，輸出電流大， 一般應用參數為：燈絲5V3A，交流輸入電壓550V，輸出直流600mA，最大屏極耐壓1800V。可直代274A。

[注意：汞管使用時必須先給燈絲通電預熱一到2分鐘，然後才能加高壓。否則將影響使用壽命。]

問題如下:

1. 請問是否一定要在機身線路上加上一組線路,先給燈絲通電預熱一到2分鐘，然後才加高壓, 如果這樣的話當我用回其他274/5Z3 整流膽的時候會否有影響?

2. 或者我可唔可以用轉座時DIY 一個線路先給燈絲通電預熱，然後才加高壓(因為301A是4腳, 274類 -八腳)代替在機身加裝線路?會唔會簡單D?有冇可能做到? 謝謝

Niceday ching
希望有機可見識你的作品唔知擁有啊
謝謝

唔用bypass cap 线路，线路唔同第一二級冇direct couple, 300B改用fixed bias



最後修改時間: 2023-08-19 01:26:16

用bypass cap 线路

大家唔知对陰極bypass cap点睇

Audionote Andy 同Peter 好鍾意用电解bypass cap, 佢D快晴無極性bypass cap賣到幾百蚊至千幾蚊一粒

已故Allen Wright 最討厭用cathode bypass cap

我會試哂兩個綫路用或唔用bypass cap, 初步比較傾向用部份bypass cap因為之前prototype 做出嚟低音較豐滿

最後修改時間: 2023-08-19 01:33:54