stork123
Active Member
I was recently testing some 12AU7s using the roll chart on the tester as a guide. After getting through a handful (that all tested really strong) I packed it in for the night.
A couple days later I was testing some power tubes using the most recent chart from 1978 that is online. When I tested some of the same 12AU7s using the updated chart with different settings, they tested much lower.
I then decided to try the supplemental tube chart book that came with the tester and the same 12AU7s tested in the middle of the first two tests.
I assume that the most recent chart from 1978 would be the most accurate, but why would the results differ by such a huge margin.
The tester was recently recapped.
Thanks in advance for any input.
A couple days later I was testing some power tubes using the most recent chart from 1978 that is online. When I tested some of the same 12AU7s using the updated chart with different settings, they tested much lower.
I then decided to try the supplemental tube chart book that came with the tester and the same 12AU7s tested in the middle of the first two tests.
I assume that the most recent chart from 1978 would be the most accurate, but why would the results differ by such a huge margin.
The tester was recently recapped.
Thanks in advance for any input.