Sorry for this dopey new guy question. I recently found a Philco-branded
2A5 that appears to be N.I.B. but in one corner of the box top it say's "MR"
where it usually says 2A5. What does this mean? Manufacturing Reject?

Thanks,
Tom

Hi,
Tom asked:

I recently found a Philco-branded
2A5 that appears to be N.I.B. but in one corner of the box top it say's "MR"
where it usually says 2A5. What does this mean? Manufacturing Reject?

Maintenance & Repair. It was done during the last couple of years
of WW2, to set aside a certain percentage of tube production for
civilian use. The idea was that once the tubes were branded MR, they
couldn't be diverted to a military contract that theoretically had a
higher priority rating.

Cheers, Alan

Wow! Thanks, Alan. That's not only interesting, it's better than I hoped.

I appreciate your help very much.

Tom
"Alan Douglas" adouglasatgis.net wrote in message
...
Hi,
Tom asked:

I recently found a Philco-branded
2A5 that appears to be N.I.B. but in one corner of the box top it say's
"MR"
where it usually says 2A5. What does this mean? Manufacturing Reject?

Maintenance & Repair. It was done during the last couple of years
of WW2, to set aside a certain percentage of tube production for
civilian use. The idea was that once the tubes were branded MR, they
couldn't be diverted to a military contract that theoretically had a
higher priority rating.

Cheers, Alan