A beam tetrode family widely used in the US comprised the 25L6,35L6, and 50L6, and their miniature versions the 50B5 and 50C5, used in millions of All American Five AM radio receivers.
A beam tetrode family widely used in the US comprised the 25L6,35L6, and 50L6, and their miniature versions the 50B5 and 50C5. They were identical to 6L6 but with different heater voltages and were used in millions of All American Five AM radio receivers.