[Elecraft] K2 PA Failure

[Dave Sergeant]

The K2 has a real on/off switch. So always using that to turn it on and 
off is certainly a good idea.

I am certainly puzzled at these claims of pa blowups. My original pair 
of transistors is going fine after 9 years and some 30k QSOs. I have 
removed the heatsink several times while fitting mods, and the last 
time I replaced the heatsink washers as well, and have never had any 
problems. I agree that the mechanical arrangement is not the best, but 
it does the job.

73 Dave G3YMC

On 17 Feb 2011 at 3:14, John Ragle wrote:

> Am I missing something here? Seems to me that the rational thing to do
> is turn on the power supply and let it stabilize (should only take a
> second or two), then turn on the K2/K3? Turning a K2 or K3 on and off
> using the power supply switch never gives the firmware/software a chance
> to initialize or shut down...just like pulling the plug on your computer
> might well cause at least mild consternation to the machine! There are
> no enormous filter caps in either Kn machine that need to be serviced at
> power on. Seems to me that using a non-matched pair of transistors is
> much more likely to be the cause of failure, as someone has already
> pointed out.


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