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Audio Note M10 Clone
Audio Note M10 Clone
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Old 9th August 2017, 08:25 AM   #21
45 is offline 45  Italy
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Quote:
Originally Posted by TonyTecson View Post
seems more realistic to me....or a 5:1 ratio....
Indeed. With 33:1 and just 110H perfomance will change like night and day from midrange to low frequency.
Audio Note, since it was sold to Qvortrup, has been producing good things but also garbage.....nothing to do with the original anyway except for those items that have remained unchanged or nearly unchanged.
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Old 9th August 2017, 09:05 AM   #22
Koonw is offline Koonw
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Any help with the sim?

T=5.75:1
Z=33:1
Pout ~0.5W @2%Thd
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File Type: png M10 output sim-1.png (73.6 KB, 258 views)
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Old 9th August 2017, 09:23 AM   #23
jazbo8 is offline jazbo8
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Audio Note M10 Clone
Why are you guys still fussing around with the ratios? Qvortrup already disclosed how AN did it, whether you like it or not, iiwis... the turns ratio is 33:1 unbalanced. But not sure where the 110H primary inductance came from....
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Old 9th August 2017, 09:46 AM   #24
45 is offline 45  Italy
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Originally Posted by jazbo8 View Post
Why are you guys still fussing around with the ratios? Qvortrup already disclosed how AN did it, whether you like it or not, iiwis... the turns ratio is 33:1 unbalanced.
If they changed it means that it was not good enough. Don't you think? Now they have made soething not too different but I wouldn't say better...

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Originally Posted by jazbo8 View Post
But not sure where the 110H primary inductance came from....
It's in one of the links you or others provided. However I doubt that one will ever get enough inductance for 650K primary impedance. 300H wouldn't be enough anyway.....assuming it can still pass enough DC current with decent losses.
Balanced or unbalanced would not change a lot. Balanced would be 1/2 of that disproportionate ratio. Still too high....for 600R load.
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Old 9th August 2017, 09:56 AM   #25
45 is offline 45  Italy
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Quote:
Originally Posted by Koonw View Post
Any help with the sim?

T=5.75:1
Z=33:1
Pout ~0.5W @2%Thd
That's over 17V rms into 600R. Are you really going to drive a power amp that is that bad?

Your result is also high distortion because you run each triode of the 5687 at 6.5 mA only....not really linear. The primary swing for 0.5W output is about 280V peak-to-peak.

Last edited by 45; 9th August 2017 at 10:01 AM.
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Old 9th August 2017, 10:05 AM   #26
jazbo8 is offline jazbo8
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Quote:
Originally Posted by 45 View Post
If they changed it means that it was not good enough. Don't you think? Now they have made soething not too different but I wouldn't say better...
No, you are jumping to conclusion... anyway, the OP did not really ask how good/bad the AN transformers were, only how he could wind one himself for his diy project, that's all...
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Old 9th August 2017, 10:06 AM   #27
pieter t is offline pieter t  Netherlands
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The output transformer is 33:1 turns ratio, which seems OK as the gain of the line amplifier (6072 SRPP cascaded to paralelled 5687) is more than 300.
Checking the schematic, loading the output stage with 600 ohm is optional .
Source impedance for the output transformer is some 1 k (parallel 5687).
Loading with 600 ohm or not, a primary inductance of some 40 H would have been sufficient.
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Old 9th August 2017, 10:08 AM   #28
45 is offline 45  Italy
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Originally Posted by pieter t View Post
The output transformer is 33:1 turns ratio, which seems OK as the gain of the line amplifier (6072 SRPP cascaded to paralelled 5687) is more than 300.
Checking the schematic, loading the output stage with 600 ohm is optional .
Source impedance for the output transformer is some 1 k (parallel 5687).
Loading with 600 ohm or not, a primary inductance of some 40 H would have been sufficient.
Nice recipe for high distortion at low frequency. Already at 100Hz....

Last edited by 45; 9th August 2017 at 10:10 AM.
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Old 9th August 2017, 10:17 AM   #29
pieter t is offline pieter t  Netherlands
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40H presents a 5k AC impedance at 20 Hz; perfectly OK for parallel 5687.
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Old 9th August 2017, 10:22 AM   #30
45 is offline 45  Italy
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Perfectly ok?

The transformer is made to work with about 10 mA anode current, and so the maximum PRIMARY swing it can do at 20Hz with just 40H (and that means the tube is about to cut off) is 35.5V RMS. If the turn ratio is 33:1 it means that maximun output is just over 1 V RMS with a lot of distortion! Likely double digit.
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