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Old 10-14-2017, 01:08 AM
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Electronic M Electronic M is offline
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Talking Ever found a 'sub-standard' tube?

My tester has found plenty, but this is the first time a tube has actually boasted being sub-standard in text to me.

Strangely enough it tests and works fine. I got a good chuckle out of an RCA 6AC7 boasting it's shoddy quality...It was probably RCA's way of marking factory seconds, but I can't help finding it's wording/application about as funny as Motorola's "DO IT RIGHT" stickers.
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Old 10-14-2017, 11:06 AM
dieseljeep dieseljeep is offline
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Quote:
Originally Posted by Electronic M View Post
My tester has found plenty, but this is the first time a tube has actually boasted being sub-standard in text to me.

Strangely enough it tests and works fine. I got a good chuckle out of an RCA 6AC7 boasting it's shoddy quality...It was probably RCA's way of marking factory seconds, but I can't help finding it's wording/application about as funny as Motorola's "DO IT RIGHT" stickers.
That tube was made during WWII and had to be marked as such. It didn't quite pass JAN standards, for the Military.
THE MR meant "Maintenance and Repair" and could be sold to the public, as new radios weren't available during the war.
Some referred MR as being Military Reject, but the former is the true meaning.
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Old 10-14-2017, 12:09 PM
snelson903 snelson903 is offline
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interesting fact to know ....
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Old 10-14-2017, 01:34 PM
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Learn something everyday!
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Old 10-14-2017, 04:04 PM
centralradio centralradio is offline
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Thanks. I was wondering about that.I have a few here.
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Old 10-14-2017, 04:13 PM
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Originally Posted by centralradio View Post
Thanks. I was wondering about that.I have a few here.
Interesting! I have tons of tubes of that vintage and have never seen one. Thanks for this informative thread.

jr
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Old 10-14-2017, 04:43 PM
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The calibration lab at work labeled substitute standard devices (calibrated to their primary standards) "SUB STANDARD." Nothing wrong with them, just an indication that they were at a step removed from the reference (and therefore not to be used for calibration of further devices of the same type).
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Old 10-14-2017, 04:59 PM
centralradio centralradio is offline
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Originally Posted by jr_tech View Post
Interesting! I have tons of tubes of that vintage and have never seen one. Thanks for this informative thread.

jr
Yes.I thought they were seconds.I guess I was close since they were not up too par for the military.
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Old 10-21-2017, 02:31 PM
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I've just found a second one in my Philco 38-116 the power rectifier has M-R stamped on the base, but lacks the amusing "sub-standard" text.
http://www.videokarma.org/showthread.php?t=269677
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