Eimac externally ties in pins pins 4,7, & 11 to the 3CX800A7's tube grid ring. That's evident from examining the base of the tube. Selecting any one of those three pins will effectively ground the grid. The cathode (apparently) internally ties into pins 1,2,3,8,9 & 10. As a method to reduce undersocket wiring clutter, is it essential to make connections to each and every socket pin to make an effective connection to the cathode? Any comments would be appreciated. Ron W2CQM/3 ________________________________________________________________________ FREE Reminder Service - NEW from AmericanGreetings.com Click HERE and never forget a Birthday or Anniversary again! http://track.juno.com/s/lc?s=197335&u=http://www.americangreetings.com/products/online_calendar.pd?c=uol5752