01-21-2017, 05:12 AM
Mike;
As you well know the 50B5 came out first, and then after a few years was replaced by the 50C5. Someone on the alternative forum said that the reason for the change was due to the fact that if one plugged the wrong tube, like a 12BA6, into the 50B5 socket that it would cause something to be energized. In any event it seems that they stopped using the 50B5 in new sets around 1950-51, though they kept making them as replacements for at least a decade after that. The two tubes are not interchangeable although on can rewire the socket to make it work, which I did a few times when I did not have a 50B5 on hand.
Regards
Arran
As you well know the 50B5 came out first, and then after a few years was replaced by the 50C5. Someone on the alternative forum said that the reason for the change was due to the fact that if one plugged the wrong tube, like a 12BA6, into the 50B5 socket that it would cause something to be energized. In any event it seems that they stopped using the 50B5 in new sets around 1950-51, though they kept making them as replacements for at least a decade after that. The two tubes are not interchangeable although on can rewire the socket to make it work, which I did a few times when I did not have a 50B5 on hand.
Regards
Arran
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
