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gnugear 10th August 2005 08:45 AM

How long does a 7199 last?
Does it wear like a normal preamp tube or is it the kind that lasts forever (figuratively speaking).

EC8010 10th August 2005 09:36 AM

If you leave it in the box, it will last very well. (Unless there's a faulty seal at the pins.)

Seriously, this is like asking, "How long is a piece of string?" In my experience, if you operate a valve at 1/3 of full dissipation it lasts so long that you don't get to find out its lifetime.

amperex 10th August 2005 07:16 PM

I can do better.......
If operated within recommended parameters, about 5000 to 7500 hours for quality NOS.

gnugear 11th August 2005 07:45 AM

Thanks ...

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