I bought a Bulova WT watchmaster at an auction about a month back. I cleaned it up, put in new tubes and got it working for short testing periods, However yesterday I noticed when cleaning my first watch with it, that when I turn the left (clean) ultrasonic cup on, after a minuet or two of operation, the fuse blows. This doesn't happen with the right (rinse) ultrasonic, which I ran for well over 6 minuets. I know it is not an issue with the cup as I've tested that theory. Are any of you familiar with these units and this issue? My hope is a faulty tube, though Im worried it could be something more pricey. Thanks, Mike.