Filiment transformer insulation

[timmy]

With 185vdc on the cathode shared with the heater of a crt would there be worry about this voltage passing a filiment transformer and it's insulation to ground. A triad 13x 6.3 .6 vac does anyone know if this trans would be sufficient ? I guess what I'm saying is a crt with a heater cathode short one would use an isolation trans for the heater so I was looking into a 3gp1 crt for a pilot tv but the pinout of this tube shows the cathode wired internally with the heater and the pilot has up to 185vdc on it and don't know if there would be any insulation problems between the heater and cathode voltage within the filiment transformer.