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| [#1] Rickard Berglund 845 using screen driver se amp. 剛剛試聲， more later... 12ax7 & 12au7 srpp 推5881， 5881 screen 推845. 見Sound Practices issue#8, winter 94/95. |
tubepower 正式會員61.xxx.xxx.15 |
2017-06-01 12:52 | |
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| [#2] Rickard Berglund 845 using screen driver se amp. pic #1...  |
tubepower 正式會員 61.xxx.xxx.15 |
2017-06-01 13:24 |
| [#3] Rickard Berglund 845 using screen driver se amp. pic #2 ...  |
tubepower 正式會員 61.xxx.xxx.15 |
2017-06-03 20:38 |
| [#4] Rickard Berglund 845 using screen driver se amp. 師兄高手，八掛吓，部機是否用inter牛推？B+電壓幾高？ |
baker.steven 正式會員 112.xxx.xxx.179 |
2017-06-04 12:06 |
| [#5] Rickard Berglund 845 using screen driver se amp. baker.steven大師太過奖了! 不用interstage牛， B+1000V, google "rickard berglund 845" 應可找到原文。我用大陸土炮牛試制，很滿意，但還未上scope加入feedback loop. |
tubepower 正式會員 202.xxx.xxx.47 |
2017-06-04 23:33 |
| [#6] Rickard Berglund 845 using screen driver se amp. 事實証明要有獨立的火牛提供高壓給845. 本線路特別之處是12ax7+12au7 srpp driving 5881 screen grid.  |
hotiron 會員 49.xxx.xxx.243 |
2018-04-13 20:11 |
| [#7] Rickard Berglund 845 using screen driver se amp. 事實証明要有獨立的火牛提供高壓給845. 本線路特別之處是12ax7+12au7 srpp driving 5881 screen grid. ... not srpp, should be asymmetry mu follower. |
imb 會員 61.xxx.xxx.43 |
2024-01-06 10:03 |
| [#8] Rickard Berglund 845 using screen driver se amp. Here's the schematic of the 5881 screen drive from Sound Practice issue #8 Johnny  |
johnnykmtang 會員 70.xxx.xxx.22 |
2024-01-06 19:25 |
| [#9] Rickard Berglund 845 using screen driver se amp. Here's the schematic that I redrawn and tested with LTspice simulation. The value of few resistors need to be changed which includes R3, R9 and R10. I hope "tubepower" could share his schematic with us. Johnny  |
johnnykmtang 會員 70.xxx.xxx.22 |
2024-01-07 02:38 |
| [#10] Rickard Berglund 845 using screen driver se amp. Sorry that I made some mistakes in my previous schematic. I have updated the correct schematic as attached. However, I do like the symmetric 12AX7 mu follower. Johnny  最後修改時間: 2024-01-07 05:50:15 |
johnnykmtang 會員 70.xxx.xxx.22 |
2024-01-07 05:49 |
| [#11] Rickard Berglund 845 using screen driver se amp. R3 should be 6.8K, not 68K, I believe it is a typo in the original article. I did not try LTspice, however, all dc voltages obtained seem to match with the designer's. imb (tubepower). |
imb 會員 61.xxx.xxx.43 |
2024-01-07 11:14 |
| [#12] Rickard Berglund 845 using screen driver se amp. Hi IMB, thanks for clarification on R3 which should be 6.8K. I ran the simulation again. It shows the output from the 12AX7/12AU7 mu follower is really clean indeed.  |
johnnykmtang 會員 70.xxx.xxx.22 |
2024-01-08 00:05 |
| [#13] Rickard Berglund 845 using screen driver se amp. Following is the output from the EL34 which drives the 845. The plate voltage at EL34 plate is 350Vdc as mentioned in the Sound Practice article. The 2nd harmonic is 50dB down which is about the same measured by the author. I am hoping IMB and hotiron would have the same result. Looking forward to hearing your test result. Johnny  最後修改時間: 2024-01-08 00:18:51 |
johnnykmtang 會員 70.xxx.xxx.22 |
2024-01-08 00:09 |
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