Need matched IRFP240's, IRFP9240's, 2SK370's... Or not? - diyAudio
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Old 12th May 2008, 06:44 PM   #1
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Default Need matched IRFP240's, IRFP9240's, 2SK370's... Or not?

My F4 adventure goes on... After solving the heatsinks issue, next thing I'm in trouble with is the gain devices.

The First Watt F4 sports 3 IRFP240, 3 IRFP9240 and 2 2SK370 per channel. Now... I don't really know if I need matched devices, nor which ones must be matched together.

While looking for them on MOUSER and Farnell, I also discovered that the price isn't so popular after all... 2-4 USD per device, it becomes not-so-cheap when you have to buy a lot to match 'em. I really need some advice, here. I also would be willing to buy them from some of you guys, if you have the matched devices I need.

Both explanations about what I need, what to be matched, and any kind of offerings, are truly appreciated.

Thank you so much.

Giacomo
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Old 12th May 2008, 07:31 PM   #2
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F4 matched FET's
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Old 12th May 2008, 07:35 PM   #3
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Here's a tip:

Ask the moderators to collect all your F4 build posts into a single thread and have it titled "My F4 build thread" or something like that. This way, all your related questions can be directed in that single thread instead of opening a new thread for each of your questions.

Since you need to click and acknowledge you searched before posting, I suggest you also abide by that instead of just clicking it to get your thread posted. Matched devices questions come up very frequently and there are numerous members who offer device matching in Europe as well as North America.

Best wishes with your build and despite what I say above, don't be shy about asking questions ... just do it in an organized way and you'll find more than enough help
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Old 12th May 2008, 07:58 PM   #4
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Thank you twichie, the point is that everything started with the idea of "evaluating" the situation, then it became an actual work, and I have fragmented the various phases in these almost-useless threads. I sure do some research, usually, but this time I felt that my question of the three different devices would have been a bit "particular"... Forgetting that many F4-builders could have had the exact same idea before.

My apologizes for that.

I'll now check that thread, thank you again.

Giacomo
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Old 13th May 2008, 03:06 PM   #5
GuidoR is offline GuidoR  Italy
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Hi Giacomo,
I also am currently building a F4, and I have most of the thingies you need. please send me an e-mail and I will give you some informations.
Oh, I just forgot, I live in Bergamo, just a couple of steps from your home...

Guido
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Old 13th May 2008, 03:09 PM   #6
GuidoR is offline GuidoR  Italy
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oops!
I forgot to activate my e-mail.
Now I think it's on
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Old 13th May 2008, 03:10 PM   #7
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This is really great, Guido.

I write you on p.m.

Ciao!
Giacomo
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