lewm,
I dont know where you get your information from, but fake Telefunkens and Mullards and relatively rare and nearly impossible to fake correctly. I have never known any fakes that can duplicate the Tele "diamond" or the characteristic internal structure of these tubes. Same with the internal structure of Philips Europe tubes as well as the acid etched codes which are present. Differentiating Matsushita 9 pins from Philips Europe is a bit more difficult but still no complicated. A bit of quick research and you can spot fakes from some distance.
I dont know where you get your information from, but fake Telefunkens and Mullards and relatively rare and nearly impossible to fake correctly. I have never known any fakes that can duplicate the Tele "diamond" or the characteristic internal structure of these tubes. Same with the internal structure of Philips Europe tubes as well as the acid etched codes which are present. Differentiating Matsushita 9 pins from Philips Europe is a bit more difficult but still no complicated. A bit of quick research and you can spot fakes from some distance.

