Testing an antenna change over relay question

[Chris Wilson]

I have a big Russian co-axial antenna change over relay based box (home made) that is supposed to direct the antenna to either a TX running a kilowatt on 136kHz or to my Kenwood TS-590 used as a receiver, connecting the aerial to the RX antenna socket. it worked fine for weeks, then something *VERY* nasty happened. It got 1kW of RF up the RX antenna socket, and needless to say the results aren't pretty...

I want to test this thing in a safe way. if i put say a 24V Xmas tree light bulb across the RX antenna socket of my relay box would it blow if the relay misfired or whatever and sent the RF to the receiver socket of the box? The box has an internal boost board to give the relay 24V from a 12V input, I am wondering if it's iffy and the relay failed to change state. Thanks.