Glenn please don't!
You don't want me to get another tube addiction do you?
Seamaster well done, now you've seen the light.
Spending on a tester is the best tube money one ever spends.
The B&K 747 is a great tester, the short and leakages tests one of the best at 100Mohm.
However they test a 6SN7 at 19mA instead of 9mA so your results will be lower.
That means a good 6SN7 on the B&K is better than what you read.
Make sure it's been rebuilt/checked/calibrated.
OK I won't send the adapters you would get a addiction to $300.00 tubes? OK I will just bring them in the summer.
Have you tried the LP2 tubes yet?