Found two original's of the Eimac Application Bulletin's - one is #8 "The Care and Feeding of Power Tetrodes' and the other is #9 "Single Sideband" - why have a lousy pdf copy when you can have the real thing! Send me $3 for postage and I'll pop both of them in a big envelope and mail them to you. 73Bob Groh, WA2CKYAddress good in Callbook