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| Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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17th Apr 2019, 6:20 pm
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#1 |
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Heptode
Join Date: Aug 2004
Location: Woodbridge, Suffolk, UK.
Posts: 501
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2SK133 & 2SJ48 Mosfets
Not sure if this should be in hifi. I have a couple of Maplin MOSFET amp boards. Is there a equivalents for these devices. Many thanks
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17th Apr 2019, 6:28 pm
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#2 |
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Octode
Join Date: May 2011
Location: Lancashire, UK.
Posts: 1,351
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Re: 2SK133 & 2SJ48 Mosfets
Yes there is. Have a look at these from Exicon.
http://www.exicon.info/products.php You want the single die 8amp devices to keep originality although there are double die (16 amp) devices available. The double die parts would have twice the gate capacitance, however I wouldn't anticipate any issue if you did use those. The two device numbers are ECF10N20 and ECF10P20 |
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17th Apr 2019, 6:38 pm
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#3 |
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Heptode
Join Date: Aug 2004
Location: Woodbridge, Suffolk, UK.
Posts: 501
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Re: 2SK133 & 2SJ48 Mosfets
Thank you for your quick response
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17th Apr 2019, 6:45 pm
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#4 |
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Octode
Join Date: May 2011
Location: Lancashire, UK.
Posts: 1,351
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Re: 2SK133 & 2SJ48 Mosfets
You're welcome.
The original Maplin design which itself is based on the original Hitachi lateral FET application notes is a terrific performer. |
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17th Apr 2019, 9:12 pm
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#5 |
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Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,857
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Re: 2SK133 & 2SJ48 Mosfets
That Hitachi application note amp turned up all over the place under various names and is, as said a good performer.
THe most elaborated published design using these transistors was probably the David Hafler DH200 which is quite different to the maplin amp. David
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
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27th Apr 2019, 10:52 pm
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#6 |
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Octode
Join Date: Mar 2016
Location: Knutsford, Cheshire, UK.
Posts: 1,488
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Re: 2SK133 & 2SJ48 Mosfets
Hi Stuart,
I believe I have some of the original Hitachi 2SJ48 and K133 here somewhere. Are you going to build the amp?
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...where on earth did that spring/screw go?? |
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28th Apr 2019, 1:59 am
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#7 |
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Nonode
Join Date: Jun 2013
Location: Surbiton, SW London, UK.
Posts: 2,801
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Re: 2SK133 & 2SJ48 Mosfets
You will get the same performance with the later TOP-3 flat pack devices that will fit the
board using a single screw and nut ; 2SK413 and 2SJ118, also Hitachi devices |
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30th Apr 2019, 4:20 pm
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#8 |
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Heptode
Join Date: Aug 2004
Location: Woodbridge, Suffolk, UK.
Posts: 501
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Re: 2SK133 & 2SJ48 Mosfets
Hya, think I have messed up on replies, phone just too small now, especially on this site. Yes I plan to make two of the amplifiers up, have most things if not all except devices. Thanks also for other suggestions too.
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30th Apr 2019, 5:45 pm
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#9 |
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Heptode
Join Date: Feb 2008
Location: Leven, Fife, Scotland
Posts: 823
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Re: 2SK133 & 2SJ48 Mosfets
Hi Stuart, How about these, they were working when removed from something I scrapped a few years ago. Norman
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30th Apr 2019, 6:44 pm
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#10 |
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Octode
Join Date: May 2011
Location: Lancashire, UK.
Posts: 1,351
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Re: 2SK133 & 2SJ48 Mosfets
Here is a simulation of the amp for those that might use LTspice. The file will run on either LTIV or LTXVII. What is actually surprising is that someone reckoned the amp was unity gain stable and believe it or not the sim shows that to be basically true.
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4th May 2019, 4:14 am
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#11 | |
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Heptode
Join Date: Aug 2004
Location: Woodbridge, Suffolk, UK.
Posts: 501
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Re: 2SK133 & 2SJ48 Mosfets
Quote:
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5th May 2019, 9:03 pm
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#12 |
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Heptode
Join Date: Aug 2004
Location: Woodbridge, Suffolk, UK.
Posts: 501
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Re: 2SK133 & 2SJ48 Mosfets
Thank you for all the comments. Now sorted. Thanks Norman.
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