FKV550n replacement - diyAudio
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Old 29th October 2009, 03:16 AM   #1
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Join Date: Aug 2009
Default FKV550n replacement

I accidently shorted one of the fets (FKV550n) while looking at the waveforms on the o-scope. The fuse in the B+ line blew quickly, but apparently was too big. Now the amp draws excessive current. And these fets are shorted 2-3. I can't find a replacement, any suggestions on a suitable replacement or where can I find this fet? Thanks.
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Old 29th October 2009, 10:52 AM   #2
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Join Date: Nov 2003
Location: Louisiana
If you need fully encapsulated FETs, there aren't many options. I use the IRFIZ44 (note that there are two 'I's).

Digi-Key - IRFIZ44NPBF-ND (Manufacturer - IRFIZ44NPBF)
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Old 1st November 2009, 01:37 AM   #3
jol50 is offline jol50  United States
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Join Date: Nov 2007
The IRFIZ worked fine in a couple I did with those in the PS. Sanken mosfet are hard to find or $15 each from sony or someone. The output transistors I've had much better luck getting.
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