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Old 10th August 2019, 12:13 AM   #131
bullitt5094 is offline bullitt5094  United States
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Well there ya go... Lemonade out of lemons.
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Old 10th August 2019, 12:51 AM   #132
6L6 is offline 6L6  United States
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The store will have them again. Also, it's not that hard to do it yourself...


http://www.firstwatt.com/pdf/art_matching.pdf

Transistor matching
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Old 11th August 2019, 11:48 AM   #133
Jason is offline Jason  Australia
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Originally Posted by bullitt5094 View Post
Awesome! Thanks Jason. Will you send out notifications via the email notification link on the product page? Is that the quickest way to know they are available?
Yep
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Old 15th August 2019, 02:49 PM   #134
tooppy is offline tooppy  France
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Originally Posted by bullitt5094 View Post
Help! Instead of buying a matched set of (2) 170s and (2) 74s from Punkydawg, I apparently ordered a matched set of (4) 74s by accident. So if I buy a matched set of (4) 170s can I use them with the 74s I already have or do the 74s need to be matched to the 170s to work correctly in the F5?
Is your question : what has to be paired ?
One 74s with one 170s ?
Or, one 74s with one 74s , idem for the 170s ?
In others words , pairs have to be made by board or by jfet types ?

I guess it is by types but I would appreciate someone make it clear.
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Old 16th August 2019, 02:40 PM   #135
bullitt5094 is offline bullitt5094  United States
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This is what I got for matched FETs. I guess you can assume they all need to be matched to each other looking at the numbers and the fact the N and P are in their own bags. Not a P/N combination in each bag. I am NO expert on this though. I am a simple assembler working hard to understand the what/why behind all this black magic while trying to keep the smoke in.
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File Type: jpg Matched 74 174 P N Fets.jpg (605.0 KB, 44 views)
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Old 16th August 2019, 03:17 PM   #136
tooppy is offline tooppy  France
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Originally Posted by bullitt5094 View Post
This is what I got for matched FETs. I guess you can assume they all need to be matched to each other looking at the numbers and the fact the N and P are in their own bags. Not a P/N combination in each bag. I am NO expert on this though. I am a simple assembler working hard to understand the what/why behind all this black magic while trying to keep the smoke in.
So you confirm my thought, thanks.
Personnally I would try to keep the smoke out
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Old 16th August 2019, 03:38 PM   #137
bullitt5094 is offline bullitt5094  United States
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No. The smoke comes pre-installed. There is only a problem when you see it leak out. Believe me... I R A expert.


The waiting for the Italians to get back to work and ship me my Chassis is killing me. It's all I need to finish the F5. I work for a very large corporation based in Germany. I think the entire company should be on the same vacation schedule and I vote for theirs. Only fair, right?
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Last edited by bullitt5094; 16th August 2019 at 03:44 PM.
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Old 16th August 2019, 03:45 PM   #138
tooppy is offline tooppy  France
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No. The smoke comes pre-installed. There is only a problem when you see it leak out. Believe me... I R A expert.
....and the flame too ...
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Old 18th August 2019, 06:54 PM   #139
tooppy is offline tooppy  France
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Can someone confirm that we have the mosfet 9240 in Q3 and 240 in Q4 please ?
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Old 18th August 2019, 07:23 PM   #140
Dennis Hui is offline Dennis Hui  Canada
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Yes, you can use IRFP240 for Q4 and IRFP9240 for Q3.
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