For Sale: One KFLA-3A 8 pole filter for 2.8 kHZ. Makes net operation much more pleasant to work. As new, $165 plus USPS. M.O. or personal check only. This is an Elecraft filter which is guaranteed. Mahalo, Doug W5JV Visit https://www.qrz.com/db/W5JV for some great vacuum tube finds.