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Old 17th December 2015, 06:37 PM   #1
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Question How to choose Mosfets for a CRESCENDO ME

Hi to all
Since there are extremely experienced people on this forum and I know nothing about Mosfet matching, I'd really appreciate a hint
I'm building a Crescendo Millennium Edition (dual mono version) from the Elektor Magazine article and I'm stuck on the choice of the two pairs of 2SK1530/2SJ201 Mosfets. Apart from the fact that they are not easy to find any more (and I live in Europe) I don't understand what is mosfet-matching about. There's no reference about matching on the Elektor article
So far I have found the following sources to buy them:

1. This Forum
User "NicMac" is selling these Mosfets on the forum from this topic:

Operating Vgs and Yfs matched 2SK1530/2SJ201 for the F5, F5 Turbo and F5X

And this is the list of his available Mosfets:

https://docs.google.com/spreadsheets...=2&pli=1#gid=0

Looking at the list, I really don't know which one I should choose...


2. Tech DIY Company Store
http://www.tech-diy.com/Store/LatFets.htm

They sell a pair of these mosfets for 12$ and a matched pair for 40$, a significant difference in the price!!

3. AmpsLab
2SK1530 2SJ201 Toshiba Mosfets - Buy Online @ AmpsLab

40$ for two pairs. No specification about matching.



Many thanks in advance

Last edited by Harold Barrel; 17th December 2015 at 09:12 PM.
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Old 17th December 2015, 09:05 PM   #2
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Crescendo me, is a 1 pair output amplifier ,so you can use unmatched mosfets
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Old 17th December 2015, 09:13 PM   #3
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A cheap readily available pair would be irfp240/irfp9240
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Old 17th December 2015, 09:23 PM   #4
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Quote:
Originally Posted by thimios View Post
Crescendo me, is a 1 pair output amplifier ,so you can use unmatched mosfets
Thank you thimios
So you are saying that I could choose any two pairs of the ones sold by NicMac on this forum and it won't make any trouble in the amp?



Quote:
Originally Posted by nigelwright7557
cheap readily available pair would be irfp240/irfp9240
This sounds also interesting!
You mean that this pair would be a perfect equivalent to the 2SK1530/2SJ201 Toshiba pair? No MODs required in the amp design and/or wattage power difference?
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Old 17th December 2015, 09:23 PM   #5
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Harold,
You are under moderation for the first few posts like all new members are. When you edit a post, it goes back into the queue to be re-moderated.
That's "where the hell" it went
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Old 17th December 2015, 10:39 PM   #6
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Quote:
Originally Posted by Harold Barrel View Post

This sounds also interesting!
You mean that this pair would be a perfect equivalent to the 2SK1530/2SJ201 Toshiba pair? No MODs required in the amp design and/or wattage power difference?
Should work fine.
I have designed and built numerous amps with these mosfets.
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Old 8th January 2016, 11:16 AM   #7
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So, thanks for your responses so far.
I have decided to build the amp with the original mosfets and not with the IRFP240/IRFP9240 because I've found a Chinese seller who sells 2SK537, 2SK1530 and 2SJ201 mosfets at a very good price
He says that all the transistor are new and original from Toshiba (I've asked) but there's no matching.

Here are the ebay links:
5pcs 2SK537 Encapsulation to 220 Transistor MOSFET N Channel 900V | eBay
2SJ201 Encapsulation to 3PL | eBay
1pcs 2SK1530 Encapsulation to 3PL N Channel mos Type High Power Amplifier | eBay

If someone could please confirm that the absence of matching won't make any difference in my stereofonic (dual-mono) version of the Crescendo ME, I'll buy them

Otherwise, there are still same matched pairs from NicMac (https://docs.google.com/spreadsheets...=2&pli=1#gid=0) but they are more expensive.


Thanks in advance
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Old 9th January 2016, 08:33 AM   #8
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There is nothing to match if you only have a single pair of mosfets, transistors or whatever. This has already been advised by thimios.

If there were 2 or more Mosfet pairs in each channel, there could be some benefit to current sharing by matching the N types and also matching the P types separately, because N and P type Mosfets will never match as complementary pairs. Consequently, if you only have 1 pair in each channel, don't bother trying to do what is impossible.
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Old 9th January 2016, 10:06 AM   #9
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@Harold Barrel.
I can not confirm whether it is the original and if they are matched but here's another source mosfets.
Semiconductor: 2SJ201KIT (2SJ 201 KIT) - TRANSITOR KIT 2SJ201-Y (F) AND... - US$ Site

And another with matched pair.
Tech DIY Company Store
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Old 11th January 2016, 10:54 AM   #10
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Quote:
Originally Posted by Ian Finch View Post
There is nothing to match if you only have a single pair of mosfets, transistors or whatever. This has already been advised by thimios.
Ian Please, don't be upset
I haven't ignored thimios' advice; I just wanted to be sure - this will be my first audio amplifier and I'd like it to sound good!
So, thanks for your explanation Now it's clear.


Thank you too, Project16
I've had found that sites also. The Irish one is somewhat expensive...
I think I will go for the Transistors sold from the Chinese store. He claims that all the items are original, do you think I can trust him? Here are the images:

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