Ive had a tough time finding a good amp guy in my area. One was recommended to me, but Im a little unsure My first doubt was when I asked him to add a bias pot to a Traynor Bassmaster Why? he said,thats ridiculous. Just make sure you use the right tube type. The second was asking him to add a 3-prong plug to the same amp. You dont need that thats how it was made. The third: I brought in a brand-new amp because of a ghost note . when I play a 10th-fret D on the high E string, I get a ghost note two octaves below. Since the D is at 600 Hz (5th harmonic of 120), I suspected the power supply. I get a phone call today: Sweet amp, just needs new output tubes and biasing $140. The output tubes are brand new and the amp is cathode-biased. What do you guys think?