[Elecraft] KPA500 fault at H44KW (no pwr high SWR)

[wa9fvp]

Here's a funny story.  Last week I ordered a KPA500.  Two days later a nearby
Ham dropped off his KPA500 that failed.  His K3 was showing high SWR with no
power.  He purchased his a year ago and didn't want to pay the expense of
shipping it back to the factory.

I found a defective Q5 (see the TR switch schematic) on the Filter board. 
Q5, an IPA50R399P is a 550v MOS Power Transistor.  My question is;  Q4 a
similar device (an IRFSL9N60A) with almost identical specifications except
it's a 600V, MOS transistor.  Can I use it as a replacement for an
IPA50R399P?

Jack WA9FVP
Willco Electronics



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Jack WA9FVP

Sent from my TRS-80 :-)
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