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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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19th Dec 2010, 3:35 pm | #1 |
Retired Dormant Member
Join Date: Nov 2009
Location: Carmarthen, Wales, UK.
Posts: 79
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12AT7WA Maximum altitude ratings
Looking through the Tung-Sol data sheet for the 12AT7WA, which is a rugged version of the 12AT7, under the absolute maximum ratings it has a maximum operational altitude of 10,000 feet.
I really can't work out why this would be the case, and if the regular version has a lower altitude rating. The thing that really bugs me is why, is it something to do with envelope cooling by air convection? Thinner air meaning less efficient cooling. It's not a concern with the project at hand, but I never heard of an altitude rating for valves before! |
19th Dec 2010, 3:40 pm | #2 |
Octode
Join Date: Jul 2005
Location: Newport, Gwent, UK.
Posts: 1,623
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Re: 12AT7WA Maximum alititude ratings
Hello,
Somewhat OT, but my colour laser printer has an altitude adjustment! Michael |
19th Dec 2010, 3:52 pm | #3 |
Rest in Peace
Join Date: Dec 2008
Location: Burton upon Trent, East Staffordshire, UK.
Posts: 1,686
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Re: 12AT7WA Maximum alititude ratings
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