No, that is a secondary benefit of that tube...and often the NCL-2000 bandswitch joins it in the parts bin. That tube doesnt need any outside help to self destruct. Surprisingly since I ran that amp from 1964 to 86 quite heavy in contests, DX chasing and ragchews but I dont remember screwing up the antenna switch but anything was possible. It now loafs at light duty with the 100V on AM and SSB, and 75A4 that Ive had since 65. You can also clip the screen pins and use it as a dummy when running one tube or making extended SA tests.