Motorola VT-71 Buzz

[carlpete50]

Hi I just finished restoring a Motorola VT-71 television. I replaced the electrolytics, all wax/paper capacitors, selenium rectifiers and all resistors that were out of tolerances. The picture looks great, but when running the tv through a digital converter box for off air antenna stations, there is a buzzing sound coming through the speaker all the time. When using the fine tuning, the buzzing gets worse when the picture looks the best, but when the picture is not as good the buzzing isn't as bad. With more contrast, the buzzing is more profound. If I disconnect the digital converter box from the tv the buzzing goes away; so definitely the converter box is overloading the audio on the tv. Is there anything that can be done to correct this problem. I don't know if this is part of the problem; after the tv is turned on the filaments on the glass ballast tube glow very bright, but some are still glowing lightly when all the tubes have lite up and the tv is operating. Other than that I'm real happy with the restoration. Any help would be greatly appreaciated.