Any class A amp with 2SK1058/2SJ162 ?? - diyAudio
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Old 24th December 2005, 04:56 PM   #1
nina is offline nina  United Kingdom
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Default Any class A amp with 2SK1058/2SJ162 ??

I am looking for a low power ( 10-25W) class A amp using with 2SK1058/2SJ162 MOSFET but cannot find it yet? Any guide? Thanks
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Old 24th December 2005, 08:11 PM   #2
lineup is offline lineup  Sweden
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I searched for 2SK1058 here.
I found several schematics.
Not for full Class A, but would be something to start working with.

2SK1058 / SJ162 is a very good choice.
They have been popular in amplifier outputs.

I am almost sure you will find some others interested in making such a project.
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Old 24th December 2005, 09:08 PM   #3
mlloyd1 is offline mlloyd1  United States
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The Audio Express has had a couple of class A designs in this power range using similar Hitachi MOSFETs. Maybe someone has the issue numbers. I can't get to mine.

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Old 25th December 2005, 09:10 AM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
push pull presumably?

+-22Vdc rails will give about 17W into 8ohm at 60 phase angle. The output bias current needs to be about 1100mA (24W/FET) for full classA into 8r.
It will go to 25W into 4r at 55 degree phase angle but most of this is classAB, unless you increase the bias to 1800mA (40W/FET, very hot!).

Try a simple ClassAB design modified to high bias. If you like the sound you will only have to change the voltage amp PCB for another and the cost will be quite low. The big cost is in the PSU, sink and case.

At these very high temps it might be worth thermally coupling the bias control to the output sinks. Even using radiation coupling might be enough to start cutting back on the bias as the temps come up. I have 400mA on a resistive bias control and it appears OK.
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Old 25th December 2005, 09:19 AM   #5
joensd is offline joensd  Germany
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Search for "zenquito" here in the forums.
Im pretty sure somebody built a HT amp with it.
You can adjust power output and bias by choosing your voltage rails.
See here:
http://perso.wanadoo.fr/jm.plantefeve/sche.html
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Old 25th December 2005, 05:12 PM   #6
nina is offline nina  United Kingdom
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Thanks for all suggestion. "zenquito" looks interesting but just wonder if the 2SK170 still available. I will try get the page interpreted.

Thanks again.
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Old 25th December 2005, 05:34 PM   #7
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Possible (better) substitution:
2SK389 (BL or V)
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Old 25th December 2005, 05:59 PM   #8
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Look for Boberly-Audio.
regards Walter
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Old 26th December 2005, 07:40 AM   #9
AndrewT is offline AndrewT  Scotland
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Hi,
for all your transistor needs in the UK, start your enquiry with http://www.dalbani.co.uk Excellent pricing, enormous range and good service.
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Old 26th December 2005, 09:03 AM   #10
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Quote:
just wonder if the 2SK170 still available
Linear Systems of the US is now making these
LSK170 and LSK389
Check their web site.
http://www.linearsystems.com/
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