Thanks to Craig and all - called AES again and the order taker knew exactly what I was looking for. He said he would "enlighten" some of the other sales folks. 73, Bill Riches, WA2DVU Cape May, NJ The cap's still available from Antique Electronic Supply (www.tubesandmore.com) -- as Dr. Jerry suggests. It's their stock # C-EC40X3-250 .