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Old 12th September 2010, 04:54 AM   #1
j beede is offline j beede  United States
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Default What substitutes are you using for J49/K134?

What are people using to repair Halfer DH-220 style output stages? I need matched replacements for j49/k134.
...j
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Old 12th September 2010, 07:09 AM   #2
djk is offline djk
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Hafler used EXICON ECF10P16, ECF10N16 in the last production of those amplifiers.

EXICON
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Old 12th September 2010, 09:51 AM   #3
wahab is offline wahab  Algeria
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Quote:
Originally Posted by j beede View Post
What are people using to repair Halfer DH-220 style output stages? I need matched replacements for j49/k134.
...j
2SJ162/2SK1058 will do it perfectly provided you
have a bias trimpot to reset the quiescent current
and that you can live with the different casing...
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Old 12th September 2010, 10:21 AM   #4
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"and that you can live with the different casing... "

Right.
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Old 12th September 2010, 11:49 AM   #5
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Shameless plug -- I have matched J162/K1058 on my webstore.
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Old 12th September 2010, 04:18 PM   #6
j beede is offline j beede  United States
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Thanks for the tips. Odd... No one is currently producing equivalent J49/j134 complementary MOS devices in a standard to-3 case? I think the Exicon 10p16/10n16 are also long out of production. I'd like to see how people are mounting the power tab style mosfets where the aluminum "can" is supposed to go. Per the Renesas datasheet the 2sj160 looks adequate for Hafler style ~60V rails.
...j

Last edited by j beede; 12th September 2010 at 04:46 PM.
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Old 12th September 2010, 04:29 PM   #7
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how many do you need, PM me...

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Old 12th September 2010, 04:37 PM   #8
wahab is offline wahab  Algeria
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Quote:
Originally Posted by j beede View Post
Per the Renesas datasheet the 2sj160 looks adequate for Hafler style ~60V rails.
...j
They are 120V Vgs , safety margin is close to 0 with 120V total
voltage supply..
Better to stay in the cautious side and go for the 2SJ162 160V Vgs.
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Old 13th September 2010, 04:36 AM   #9
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Default re: What substitutes are you using for J49/K134?

Try these:

HAFLER (HITACHI) 2SJ56 2SK176 200V 8A T0-3 MOSFET pr - eBay (item 380260810461 end time Sep-18-10 11:45:58 PDT)

Direct replacements for the J49/K134 but with a higher voltage rating. Matched on a Hafler tester. The seller can provide matched quads if you ask.

Keith
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Old 13th September 2010, 01:36 PM   #10
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try using exicon fets from altronics
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