plategridcaps 1/4" Ceramic Plate/Anode/Grid Cap good quality ceramic cap for 1/4 inch (6.35 mm) tube top caps. Fits tubes such as 6KG6/EL509/EL519, 6J7, 6K7, EF37, etc. cap-14-ceramic$13.95 9/16 inch Ceramic Plate/Anode Cap Fits tubes such as 811, 813, 810, etc. cap-916-ceramic$3.85 3/8 inch Ceramic Plate (Anode) Cap Fits tubes such as 807, 6BG6, 6146, etc. cap-38-ceramic$7.59 Triode, USA Customer Service M-F 9AM-4PM CT 1-800-774-3201 Email us Anytime: questions@triodestore.com