[Hallicrafters] Hum on tx audio

[ss409ss at aol.com]

   I've had this on and off hum on TX with the Hurricane, sometimes it does it, sometimes it doesn't. I decided to rebuild the supply and replaced all of the caps but not the 30-30uf chassis mounted one. I made two printed circuit boards from G10 epoxy, mounted all of the new caps in the HV supply and covered the tiny caps with the old covers. Anyway the supply is stiff, all recapped with new, I still have a hum/buzz on tx, especially when I drop the mic gain to zero it becomes more prevalent. The radio has new tubes, PS all recapped except the 30-30. I tried different mics, plus it does it without the mic and in tune mode as well as ssb.. Anyone have any ideas on where to look? Tnx Richy N2ZD