Teac X3R reel to reel troubleshooting help

[jasonguitar]

I have a Teac X3R that has a problem. I found this deck sitting on a curb completely intact a few years ago. I recently pulled it apart and cleaned, lubed, changed belts, demag-ed, etc. Transport works great. Direction controls work great. Heads are in nice shape. Plays back great. The problem it has is that when you first press play, a hum/buzz comes through the outputs but will abruptly go away at some point. Sometimes quickly, sometimes slowly. It will also come and go from time to time during playback. I found one burned up resistor across a relay so I replaced that but no difference. I figured it was dried up capacitors but I've replaced all the electrolytics in the power supply and about 80% of the caps throughout but the problem remains the same. Could a relay cause this type of problem? It seems like all the relays are functioning. Any tips?

[miklos]

Could a relay cause this type of problem? ?[/QUOTE]
Most unlikely , but is the relay make a mechanical buzzing sound the same time when the buzzing is in the speakers? If it is, then maybe the power supply powering the mechanism is intermittently defective.