Peter, If you change all 4 you can check them afterwards to see if any are still good - although at the price, its hardly worth it!
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Here is a link to the PSU that I use with my KX3 -? ?You will need at least a 2-5A Buck Convertor ("DROK") or equivalent, to create a nice 19-2VDC supply.
(I use this combo up at my trailer in the Summer)
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This is the heatsink I usually add to 'ANY' QDX - as the existing cooling system is inadequate!
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Also, I have used this neat (FAN) product (originally designed for the RPi 4 (I use it with my "Inovato.com" "QUADRA"? (like a RPi3) that fits on the shelf below the QDX, making a neat WSJTX 'stack')
73
Terry
(Note: Also, Check out/join uSDX group)
Terry
