[Eliot Ness]

I'm not quite sure what you mean that your DVM won't read the old resistors.  Maybe the readings seem far off because the resistors have drifted far from their original values.

It's not unusual for some tubes to work in a circuit and other tubes, that test good, to not work.  I'd be concerned about the resistors you don't think your DVM can measure.

I'd try to get it to the original status of playing pretty good with another 6A7 and start the alignment again.  Place an ad for your tube in the classified section and I'm sure you'll get a hit.  I'd try to scare one up for you but I'm a week out of a knee replacement and can't get downstairs or drive yet.