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The C443 was designed for AC mains operation only, it is capable of about twice the output power of the former B443. The equivalent types RES364, L425D and PP430 appeared considerably later. [Jacob Roschÿ, 2003-01-17]
Rüdiger Walz: The C443 was only in use for a short time. You can hardly find a working tube anymore. It was consistently superseded by the C453. Since output tubes are subject to the greatest wear, the devices are now almost exclusively equipped with the C453. We don't know any more precise structural differences. The C453 is slightly steeper and has a lower internal resistance. Anode current and power are almost the same as the C443. We should always specify a model with the initial configuration, not with the retrofit that later works name.
So the C453 is different, but that's what happened: the tube C443 has a gain of 43, but the C453 has a gain of 53. When an amateur swapped a good C443 for the new C453 in 1932 to improve the performance of his radio, things changed but nothing. As he scraped some paint off the top of his new C453, he saw C443 appear. Much fuss was made about this matter. In the end, Philips apologized for renaming a batch from C443 to C453. There was also a similar case with renamed 506 as tube 1823. But these were exceptional cases.
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