Hi guys, I bought a vintage EL84 Mazda valve from ebay last week. It is marked in white: Mazda Valve EL84 Foreign BVA On the base it is marked '13' and what looks like a large upsidedown 'U'. The bottle is much bigger than a normal EL84. The wire valve holder won't fit over it, for instance. The sound is fantastic. I have it in a Vox AC4TV and I can't really get it to distort too much at all - I know! Huge headroom with this valve. Really bright punchy sound. I can't find any info on the web about a similar physically 'too big' valve like this anywhere. Can you help? Cheers, Michael.