6V6 enigma

[marty59]

If those 6V6's just read low on emissions and checked out ok otherwise, find/get a "known" good one to compare on your tube tester. Or, have someone else check it for you against theirs. It's not like you're using those tubes in a hard driving guitar amp and you may be surprized at how much life is really left in them. Being push-pull, as long as they test simular and being cathode biased you should be allright.

I'd run every bit of use out of them that you could. 6F6s' will often test weak and work great too, common with them. I have a tested weak/low on life 6F6G that I have in a daily player Philco and occasionally I'll re-check it and it's value stays the same and the radio sounds just as great!

Original output tubes in these old Zeniths just seem to last too!