Quote:
Originally Posted by Heatercathodeshort
First year of the 110 degree tube in the UK. 1959/60. J.
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The stamp seems to read B7H which looks like a valid factory and date code for August 1957 but when I think about it, in those years the factory code was often stamped on the tube base. As I review this thread it is suggested that a Mazda tube would have been fitted originally. Putting those two together might suggest it could possibly be a 19
67 replacement tube.
Colourstar, could you maybe have a look to see if there's another line of code stamped above the one that reads B7H? And maybe check out other date codes (the smoothing capacitor was suggested)?