[morzh]

Arran

I did test the other tubes.
Those were not 6A8 but 6A7.

I have good tubes and they do test as "good" on it. And when the guy sent the substitue 6A7 it testet practically as new, and the I retested the others and they still tested bad. And notice, the good and bad readings are stable - the same tube tested several times after other trubes have been tested will test the same.

And I have other 6J5, "G" that tests normally (on the low side but acceptable).

If the tester was doctored and the wiring was screwed up, and it results in 6J5GT/G testing bad the 6J5G will also test bad - there is no electrical difference there that would explain it.

And, yes, I looked inside the tester. I did not see any signs of tampering with panels or switches. If anyone took care of something it was done very professionally.

So, no, that does not explain it. I wish it would; then I could go in and fix it.