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The sockets are for people who fear they will burn out a lot of BS170s and probably want to make them easier to replace.?

Paradoxically they probably make it more probable that you will burn them out, due to:

1. The wires are a main source of heat transfer out of the transistor and the sockets slow that down, so the transistors will probably run hotter.?

2. The sockets add a little parasitic inductance because the leads must be a little longer now, which probably isn't normally desirable.

3. The sockets create a probability of a non-connecting wire; if that happens on one of the BS170s in a pair, then the other will probably be overloaded due to taking all the load and burn-out will be very much more probable.

I personally don't use sockets or recommend them. If you take care of your transceiver with normal precautions such as not using more than the recommended supply voltage and taking care of reasonably well matched loads, then you probably won't burn out any BS170s anyway. I had my QMX putting out 5W on 11m today on JS8Call, 27.245 MHz CB, and several long overs at 83% duty cycle lasting 3 or 4 minutes, and as usual no hint of problems; my antenna SWR is a little sub-optimal right now due to the antenna lying on top of my metal framed roof; and of course 11m is near the top end of the range and PA efficiency decreases proportionate to frequency increase. No issues. As usual... Just my opinion.?