built an amp and almost finished recently. anyways i installed plate and grid current metering. plus installed jack on bottom to monitor bias or filament voltage. anyways the plate current meter shows nothing while the grid current meter is showing me alot. Set up as B-, passes thru plate current meter (in series). After the plate meter, i run a wire that goes to bias circuit and another wire that goes to grid meter. other side of grid meter is grounded to case. any ideas or suggestions on what may or may not be going on. Any thoughts or suggestions would be greatly appreciated.