Has anyone out there ever gotten their Heathkit AT-1 to SHOW grid current? I just got this guy. It indicates about 50 ma plate current at around 10 wts out. A lower current (50 ma) will show about 5-10ma grid drive, but the meter on the AT-1 indicates nothing. Again it's fine on plate current. Yes, I've carefully scrutinized the wiring. Any help appreciated. Thanks, Ron