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I don't like unnecessary use of relays compared to solid-state because they are relatively:

1) Expensive

2) Slow

3) Noisy

4) Large

5) Heavy

6) Unreliable

There are applications where use of relays is necessary; but I have recently enjoyed avoiding them in recent QRP Labs kits for these 6 reasons.?

My other suggestion is the attached circuit for driving the QRP Labs 50W PA - this uses a P-channel MOSFET and should work on any QRP rig with active-low keying/PTT output, even if the rig output is not open source / open drain.?

73 Hans G0UPL