SBE Console V no modulation

Well one month to the day my beautiful SBE Console V decided to quit modulating. It shows a dead key of 5 watts on AM and as expected no carrier on SSB. When the mic is keyed I can say AUDIO, PEP reads about 17 watts and it immediately drops back to a 5 watt carrier. The Console V receives both AM/SSB from other stations just fine. It transmits audio for about 1 second before no audio is hear through my monitoring radio. (both AM/SSB). Three different mics, same result.

I can...

SBE Console V no modulation