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Old 2nd December 2012, 10:50 AM   #1
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Default Old class A design with 2SK146 dual JFET

Hi,

My first post..
I have an old design (LFA-50) that I originally started in the 90's and are now trying to finish. I have most of the parts lying around but have some issues with some of the old JFET and some of the other transistors.
In the design it states that the input stage is a dual JFET of type 2SK146V I have some old 2SK146BL 6L laying around. Can I use those?
I canít find the difference between V and BL also what does the 6L stands for. There are some 2SK146V parts on eBay but they cost and arm and a leg.

I also found that BF470 and BF469 can be replaced by BF472 and BF471, I hope

Any feedback is greatly appreciated.
-Thomas
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Old 2nd December 2012, 12:05 PM   #2
lineup is offline lineup  Sweden
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You can use 2SK146BL. No problem.
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Old 2nd December 2012, 02:35 PM   #3
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Welcome langholen,

The difference between V and BL:

10VDS, 0VGS - BL -> IDS = 8-16mA

10VDS, 0VGS - V -> IDS = 14-30mA

But in a difference amplifier it doesn't matter so much.

Quote:
I also found that BF470 and BF469 can be replaced by BF472 and BF471, I hope
Yes
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Old 2nd December 2012, 09:46 PM   #4
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Thanks for the quick answers, and just what I needed to hear

Now I only am missing BC560C and some capacitors that should be easy to get a hold of, and time
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