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

[Fred Townsend]

Not to contradict the expert but in addition to the specified parameters I
would want to know the on resistance (Ron) and the gate threshold voltages
were the same before I would sub.
73
Fred, AE6QL

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Wayne
Burdick
Sent: Saturday, November 01, 2014 9:54 PM
To: wa9fvp
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KPA500 fault at H44KW (no pwr high SWR)

Sure, as long as the pinouts are the same, and the voltage and current
ratings meet your switching requirements.

73,
Wayne
N6KR

On Nov 1, 2014, at 9:16 PM, wa9fvp <repair at willcoele.com> wrote:

> 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
> 
> 
> 
> -----
> Jack WA9FVP
> 
> Sent from my TRS-80 :-)
> --
> View this message in context: 
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> -SWR-tp7570161p7594358.html Sent from the Elecraft mailing list 
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