I have 3 Philips 12AX7's. 2 are identical. One says 12AX7 ecc83 in white lettering. the "twin" has a REAL logo. I got this from a REAL TUBE pedal. Smooth long plates. The center of the plate is wider on both of these. One says JAN 12AX7WA Philips ECG in green lettering. The center of the plate is narrow. Any opinions on the origin, gain, and tone would be appreciated. Sorry, no digital camera,... yet.