Sounds like an error on the schematic to me. What is shown going to the 6F6 screen grid? Dennis D. W7QHO Glendale, CA ************** On Jun 19, 2011, at 4:13 PM, Lloyd Godsey wrote: > What throws me, there is a wire shown on the schematic going from the > control > grid of the 6F6 to the lower side of the utput transformer.