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Audio Note M10 Clone
Audio Note M10 Clone
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Old 8th November 2017, 08:01 AM   #231
jerrylong is offline jerrylong  China
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Join Date: Dec 2008
Quote:
Originally Posted by jazbo8 View Post
Beautiful! So how did the transformers work out?
I used the buying OPT for the test, the turn ratio is 33:1, I will test it in real circuit to see if it has the same problems as simulation. I have not finished DIY OPT yet
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Old 8th November 2017, 05:21 PM   #232
jerrylong is offline jerrylong  China
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Tonight I tested the Voltage of each stage, line stage, #2 and #3 stage of phono are fine. There is problem of #1 of phono. Green one is LEFT and Red one is Right, I think something wrong with LEFT, can anyone help me to find it?

E145AAB4-C603-44D5-9ED8-F5DA72E93357-1900-00000200FB855417_tmp.jpg
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Old 8th November 2017, 05:36 PM   #233
jerrylong is offline jerrylong  China
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I have switched 6072 of left and right, the problem remains on left, so it is not tubes problem
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Old 9th November 2017, 02:03 AM   #234
jerrylong is offline jerrylong  China
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I pull out the 6072 and test the res of each section
1,I have tested the res from B+ to 6072 socket #1 L and R is the same, about 120K
2,socket #3 to #6 L and R is the same,about 2K
3, socket #8 to GND L and R is the same,about 5K
what I missed to lead the problem of LEFT?
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Old 10th November 2017, 03:58 AM   #235
Alllensoncanon is offline Alllensoncanon
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Location: NorCal, East Bay
Audio Note M10 Clone
Have you try changing the Upper Triode grid leak resistor form 10M to 100K?
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Old 10th November 2017, 07:19 AM   #236
jerrylong is offline jerrylong  China
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I haves the problem
This is the right circuit
IMG_6304.JPG

After I short C1, the result is same as the problem
IMG_6305.JPG

I take down this cap from LEFT
IMG_6306.JPG

And changed a new on
IMG_6307.JPG

Problem solved

Then I tested the cap, it soft breakdown, so it hard to find out this problem when power off
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Old 18th November 2017, 02:53 PM   #237
jerrylong is offline jerrylong  China
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My friend has made a 6.5K:600 OPT, it is finished today. I put them on, it is quite good, till now the clone job of M10 is finished, it sound very good.
92.jpg

94.jpg

95.jpg

96.jpg

then I will use LT-SPICE to test it and compare with the real circuit. If there is any thing to improve I will go on.
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