cmc168 hing,

Thanks for sharing your experience.

70KHz -0db is amazing. So, that was measured at the output end of the opt? I did an anode choked amp some time ago and got very sharp HF roll off making the amp not listenable. Obviously it was due to the high inductance/capacitance of the choke I got. Could the undesirable LH response of your parafeed 300B caused by insufficient inductance of the choke?

My EL156 sounds dull but you said yours
sounded clinical. I found my po shan opt weak in LH but you found yours poor in HF. Would really wish to know more about (and if possible to hear) your EL156 amp when it comes too light again especially if parafeed, ccs... can do any magic on it.

Hi thomas,
yes,measured at sec of tx.
i use poshan 40H anode choke,u said HF roll off may be due to roll-off in your driver stage,what tube u used?i perfer driver tube with low Ra that improve hf response more.
also what kind of parafeed tx u used at the time?
the poshan opt i used was a giant size with 50w power rating,so LF response ok.
I shall inform u once i got time to complete the el156 with new circuit .

cmc168 hing

Actually the plate chokes were for the driver tubes in the amp I mentioned. The output stage was not parafeed. Dr. King has kindly lent me another pair of plate choke recently. I will work on them shortly and put more details about that amp here.

請問有沒有師兄可以提供 6SN7推EL156 or 12AX7推EL156 的線路圖給小弟參考呢?
萬分感激.

近排都想砌一部PP pentode/UL, 想用6h30推KT150或 EL156, 有無好介召？

各位Ｃ兄早晨，小弟請教各位師傅，我手上有 FL152 和 WE2C51 各位有電路圖嗎？和砌機嗎？

轉眼又十年. 原文原本是放在yahoo bloc,後唔為意yahoo bloc摺左,結果幾編diy記錄都冇曬,感謝師兄將個post挖番出來,現在是不會再這樣長編大論了.

很羨慕懂得電子技術的 c-hing, 玩膽機都玩得更專業、更開心！^^

懂一些電子知識會玩得更有樂趣, 又更安全。





最後修改時間: 2019-05-25 17:19:52

Re#27
師兄的文章小弟重覆看了三四次，很值得DIYer參考，正！

#25

參考下啦

後補

請問有單端線路圖提供嗎？
再次謝謝各位關注。

這個是UL接法，又有埋電壓讀數參考，正，谢cat 師兄

For SET circuit, c-hing try try this:

http://www.single-ended.com/6550amp.htm

臨淵羨魚不如退而結網,要認識/計算一個簡單膽機線路所需的電子知識其實不多,現今網上資訊亦相當充足,有心學絕唔難.

Google search "EL156" 就可找到大大堆線路,當然並不是擺得上網就一定work,是好是壞又需要一定的知識去判斷.

6FQ7 是否= 6CG7

#36.
Thanks 師兄。

#37

#37