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Hello all,I recently received a pair of "NOS" CBS/Hytron 5814s. When I first installed them last Thursday only one worked. For kicks I tapped the dead one firmly with my finger a few times, plugged it back in, and low and behold it lit up and has been fine for 4 days now without any sign of misbehavior. My ? is, is this a fairly common tube phenomenon? The seller has offered to replace it (I notified him immediately when it first appeared dead) but I'm afraid he'll think I'm trying to get one over on him. Might the tube be OK after all? I feel as if I'm in a bit of a jam here. Thanks for any and all input.
Follow Ups:
What do the pins look like? Just plugging it in may have scraped some corrosion off the tube pins. Most old tubes, even NOS, need cleaning.
Yep, that was my first thought too.An amazingly high percentage of the tubes I get returned as defective perform perfectly here for me. Sometimes just the act of inserting and removing a tube a couple times can "clean up" bad socket contacts. I suspect that's what happens on many of the returns.
As well, if the pins on the NOS tube weren't cleaned, then I'd almost guarantee the contact problem will occur. Almost every NOS tube I get now requires me to clean the pins to even get good test readings. I go through a lot of brass bristle brushes and Deoxit D5 here!
I would recommend you return it. Some tubes have bad contacts inside, transit shocks and just friday afternoon manufacturing can often be the cause. Thing is with tubes. if it goes it may or may not take out some other parts with it. So can be expensive to risk it.NOS is great if it works and is in good condition. But who knows what has happened to the tubes? maybe they were in a Huey flying round some jungle for a couple of months, or sat in some damp bunker for 4 years. Crazy shit happens.
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