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Old 8th April 2012, 06:43 PM   #1
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Default JFET substitution for Pass B1

Could the PF5102 J-FET made by fairchild work as a replacement for the 2SK170 in the Pass B1 buffer it simulates well in spice. But I don't know how it will sound in the real world. Thanks.
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Old 8th April 2012, 10:14 PM   #2
juma is offline juma  Germany
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It will work fine. Take care about Pd_max (lower JFET, the CCS, might need some degeneration if Idss is too high - the datasheet says it can be as high as 20mA. 10mA is enough).
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Old 9th April 2012, 02:09 AM   #3
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thanks, this will save me alot of money I have like 100 of them.
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Old 10th April 2012, 01:33 PM   #4
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The 2SK170BLs are common enough on E-Bay.


The only fakes I received were from a UK supplier which were refunded (eventually).
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Old 10th April 2012, 11:35 PM   #5
Floric is offline Floric  Europe
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Why not j310 with 100R? Works really well. I can't hear any differences to the sk170 (for line level signals).

And it's available and cheap too.

Try it!



Edit: Sorry did not read your second post that you already have hundreds of pf5102

Last edited by Floric; 10th April 2012 at 11:40 PM.
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