this is a new one to me .... put 5Vdc on the 100th filiament and got normal current draw ... then without any other voltages on the tube, I noticed that light was coming thru the plate (or appeared to) aproximating the same color as the direct glow from the fil...... as I cycled to fil on and off the glow followed it in intensity .... the tube does not appear to have been abused in any way .... I thot that maybe the direct light was reflecting off the inside of the glass and to the plate and then back out but the subtle patterns in the plate may not support this .... I may have to figure out how to post a picture of this if no one else has seen this ....
