Do you have some NOS power tubes and need to match them, or need to verify their strength? We have maximatcher testing availabe at $2.00 per tube. We can test 6L6, 6V6, EL34, KT77, KT66, 6550, KT88 and EL84 tubes. Each test consists of a warm up and a grading of bias current and transconductance, as well as a short test.