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Sony VFET Amplifier Part 2
Sony VFET Amplifier Part 2
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Old 20th September 2018, 05:38 PM   #3631
badtoby is offline badtoby  United States
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How would I know and what about the other semiconductors in the circuit?
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Old 20th September 2018, 07:37 PM   #3632
arky is offline arky  Russian Federation
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Quote:
Originally Posted by badtoby View Post
How would I know and what about the other semiconductors in the circuit?
go check them
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Old 20th September 2018, 07:44 PM   #3633
arky is offline arky  Russian Federation
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I like SMPS in power amps a lot. Any experience using SMPS with this project? How is it expected to affect the sound if good (audio grade) "soft-switching" +/-30v SMPS is used instead of linear PSU?
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Old 20th September 2018, 11:34 PM   #3634
Nelson Pass is offline Nelson Pass  United States
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If you can filter the noise and they have enough current capacity, I think
they would be OK.
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Old 21st September 2018, 01:40 AM   #3635
bkdog is offline bkdog
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Sony VFET Amplifier Part 2
I looked into this pretty thoroughly and it could work fine. However, I went with linear supplies because they were simpler and cheaper.

Most SMPS' are not designed for the sort of continuous current that a class A amp requires, and the only reliable supplier I could find that produces suitable supplies were Meanwell - and the price was ultimately more that a linear PSU. Also, as Nelson says, the noise needs to be filtered very well. Many SMPSs are only specified for transient current and are not properly specified for the current requirements of a class A amp.
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Old 21st September 2018, 02:26 AM   #3636
badtoby is offline badtoby  United States
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Thanks arky for the info, for some reason I was thinking that I needed a 19 volt supply to test the V-FET's. After testing the two seem to be good and test the same as the unused pair.
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Old 21st September 2018, 05:33 PM   #3637
Nelson Pass is offline Nelson Pass  United States
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I do find Meanwell to be the best brand sampled so far.
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Old 22nd September 2018, 05:13 AM   #3638
arky is offline arky  Russian Federation
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Quote:
Originally Posted by bkdog View Post
I looked into this pretty thoroughly and it could work fine. However, I went with linear supplies because they were simpler and cheaper.

Most SMPS' are not designed for the sort of continuous current that a class A amp requires, and the only reliable supplier I could find that produces suitable supplies were Meanwell - and the price was ultimately more that a linear PSU. Also, as Nelson says, the noise needs to be filtered very well. Many SMPSs are only specified for transient current and are not properly specified for the current requirements of a class A amp.
well, SMPSes are different.

1. sony ta-n9 - up to 80W in class A, using SMPS and sounds fantastic
2. sony ta-n900 - up to 200W class AB, also using SMPS (very similar to N9)
3. sony ta-n86 - up to 20W in pure class A, SMPS as well (classic)
4. sony ta-n88 - up to 180W in class D using v-fets

I have all of these and most of all I like N9. However their SMPS has shunt regulator at output. And yes, they all sound fantastic.
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Old 22nd September 2018, 05:29 AM   #3639
arky is offline arky  Russian Federation
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Quote:
Originally Posted by Nelson Pass View Post
If you can filter the noise and they have enough current capacity, I think
they would be OK.
Thanks, Nelson. I am looking to use 300W rated "audio grade" soft-switching SMPS, usually found in "pro" amps. For each channel. So, at +/-30V on rails and 4ohm load it should be not drawing more than 2 amperes. I also think to use CLC filter on PSU output.
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Old 27th September 2018, 11:31 AM   #3640
yeuclassa is offline yeuclassa
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Default 2sk60-2sj16

Are 2sk60-2sj16 good for sony vfet part II shematics. Thanks for yours answer
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