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Old 31st August 2004, 03:40 AM   #1
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Default Matched IRFP244

I'm getting ready for a massive purchase of IRFP 244's for Aleph 1.2, Aleph 2, and a few Aleph x's. Between me and a friend, we're buying 150 so far, but the more the merrier for matching. The plan is to heat to 150 deg F in distilled water, and record Vgs at .5A and .75A. From this, we'll compute transconductance (dv/di) and divide into 4 to 6 groups to be then matched for Vgs.

This should make for very close matches. And with these quantities, They will cost less than $2.00 US each.

If anyone's interested, post here.

I'll also send everyone consecutive parts so if you want to rematch, they could be changed from say 4 groups of 6 to 6 groups of 4 and not have oddballs.

Or if you want say groups of 2 or 3 (for samller Alephs) I may give a price break because I'm looking for groups of 12 and will likely have a lot of two-zys and three-zys left over.
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Old 31st August 2004, 04:14 AM   #2
Jean is offline Jean  United States
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I am interested in a set for 2 aleph 2s.
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Old 31st August 2004, 01:43 PM   #3
jrsun is offline jrsun  United States
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Hi Brian,

I am interested in 1 set for aleph 1.2s. Thanks!

1 question:
what is the targeted matching accuracy ?
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Old 31st August 2004, 06:56 PM   #4
kslim is offline kslim  United States
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I, too, am interested in a set for 2 aleph 2s.
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Old 31st August 2004, 07:33 PM   #5
Kari is offline Kari  Sweden
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I would be interested in 2 aleph2 sets. I also assume that these are in a TO3 package?

/Kari
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Old 31st August 2004, 08:11 PM   #6
AR2 is offline AR2  United States
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I would be interested in 3 to 4 sets.
I recently purchased a Mosfet tester, so I am willing to offer that if you would like to use it. Please let me know.
AR2
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Old 31st August 2004, 09:26 PM   #7
fcel is offline fcel  United States
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- To avoid major quantity count error later on, Brian might want to clarify how many mosfets is considered as 1 set.
- e.g. AR2 wants 3 to 4 sets, how many mosfets is that?
- And Brian, you have indicated the quantity count as "group". How many mosfets is that per group?
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Old 1st September 2004, 03:48 AM   #8
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Wow. That's around 300 fets. With that many, we should have pretty tight tolerences with not much waste.

jrsun, are you making one channel A1.2? or a pair. 24 fets or 48?

Some of you may want to consider... for A 1.2, get 4 sets of 13 for a pair of monoblocks. If you spark out 1 fet by some strange act, you'll have a spair instead of trashing the whole set of 12. $8.00 would be cheap insurance. Static happens.

AR2, please clairify your quantity.

I'll work up details and nail everyone down early next week.
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Old 1st September 2004, 05:51 AM   #9
Magura is offline Magura  Denmark
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Id like 6 matched fets.

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Old 3rd September 2004, 12:56 PM   #10
steenoe is offline steenoe  Denmark
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Kari presumed they are in TO3 packages.
Would that be right??


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