Just wanted to know something: it should be ok to substitute 6L6's for the 1614's and 7027's found in our Ranger's, correct??? They will work perfectly and last just as long. If you look on the metal base of a 1614 near the crimp, you will see it stamped 6L6. It's the same tube that went through some extra testing at the factory. Regards, Darrell, WA5VGO