1L6 tubes are for sale but they usually go for $30.00. The 1R5 will replace a 1L6 but it may not oscillate on the highest frequency short wave bands. Some suggest using a 1U6 but that is even harder to find and has less fil. current. You can use the 1LA6 but it needs an adaptor.
Norm
: I have a RCA short wave portable radio that needs a 1l6 type tube. This is a hard tube to find. are their any substitues that would work?