|
You are correct in that they did not catch on. I also have a GE set that was all metal at one time. I have restored this one. At one point, a serviceman replaced the metal rectifier tube with a 5Y3.
I also have some metal 6L6 tubes. I am not sure what these were used for, although I have heard that the military in WWII used them. I have heard that these are not near as good as the glass ones.
|