[Elecraft] kpa100 power transistor

[Tom Hammond]

Hi John:

>i just put in the power transistors and like the manual said my soldering 
>wasnt hot enough to do it since its a fine tip low wattage.  so i just 
>used 2 soldering irons on each leg of the transistors for a few seconds 
>each. wondering how susceptible to heat these guys are.

If you didn't lift the pads of the PC board, you (and the transistors) in 
good shape!!!

For soldering heavy PC board pads, and especially those around the KPA100 
transistors, I suggest using a heavy-tipped iron or even a good soldering 
GUN (e.g. Weller). Wen soldering guns get too hot(!!!) and can damage PC 
board lands if not carefully controlled. When I'm soldering to large, heavy 
lands, I change tips on my T/C iron, and go to the largest (highest mass) 
tip I can find... usually a 1/4" wide tip.

Good luck,

Tom Hammond   N0SS