For anyone interested, here is a close up image of the "EF814K" in my Soundelux E47C. I too haven't been able to find any information on this particular model. I can post more pics of the innards of the tube if anyone requests/wants it.Thanks you! Can you snap a photo of the print of the tube? I am really curious what we can see there! Is ist a EF814 or EF184?