It is a bummer that you got sent some bad tubes.
Can you share who you bought them from so we can steer clear ?
Your tester seems close if you are getting a reading of 42, on the 811 settings. A good 572 may read a little less and be considered good. 36 is good for the 811. The only difference in the 572 and the 811 for that tester will be the reading that you get. Everything else will be the same setting.
You may want to let the seller know, and get some new ones, without getting paypal involved. I would try that first.
Last edited by KA9JLM; 04-30-2012 at 08:46 PM.
"Theory only works perfect in a vacuum." KA9JLM Don