RE: tube cooler

Posted by Alex Kitic (A) on November 16, 2014 at 14:39:20

In Reply to: RE: tube cooler posted by Nunki on November 16, 2014 at 10:08:08:

The temperature of some tubes that run hot is so high that adding "fins" is not going to cause a statistically significant decrease in temperature. If the temperature is 130 or more degrees, how cooler is it going to be once you add some (basically) fins? Is such a decrease in glass temperature going to radiate less back to the anode? I don't think that's relevant.

On the opposite case, with rather cold operated tubes, the effect is obviously even lower and less statistically relevant.

Let's not open the Pandora jar of the radiation vs convection and whether a colder object can radiate (and relevantly influence) towards a much warmer (hotter, in this case) object?

Last but not least, temperature is the least relevant factor in limiting the operating life of small signal tubes, like the 6922 (ECC88). Even heaters voltage is a much more relevant factor. Besides, what is the hours count for average users per annum? 3 hours average per day gets you to maybe 1000 hours per year... at 3000 hours life expectancy, that's 3 years, at least. By that time you should be replacing the electrolytes in your preamp as well, but less than 1% of users are going to replace the electrolytic caps.

Even the operating life of tubes seems to be a rather consumerist story, with lots of sales possibilities for dealers and services...
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Follow Ups Full Thread

Topic - tube cooler - wkhanna 07:20:21 11/15/14 (31)

RE: tube cooler - wkhanna 11:59:38 11/29/14 (0)

RE: tube cooler - geezerrocket 08:27:05 11/17/14 (8)

RE: tube cooler - Sherwood Forest 14:35:23 11/20/14 (1)

RE: tube cooler - unclestu 14:48:38 11/20/14 (0)

After I broke 3 Tele 12AX7s with those things ... - Dave Pogue 07:07:50 11/18/14 (5)

So you figured out how to mount them correctly? - Winston Smith 13:54:07 11/18/14 (4)

Not exactly. - Dave Pogue 14:35:12 11/18/14 (3)

No one is doubting what you claim you heard.... - Winston Smith 02:14:02 11/19/14 (2)

RE: No one is doubting what you claim you heard.... - Dave Pogue 06:04:58 11/19/14 (0)

They only suck for an instant. . . - Larry I 05:41:39 11/19/14 (0)

RE: tube cooler - johnmil 07:21:17 11/17/14 (0)

Or these - Bill Way 13:39:35 11/15/14 (3)

RE: Or these - wkhanna 16:52:58 11/15/14 (2)

RE: Or these - Bill Way 17:24:55 11/15/14 (1)

RE: Or these - wkhanna 18:53:00 11/15/14 (0)

RE: tube cooler - Caucasian Blackplate 10:42:21 11/15/14 (6)

RE: tube cooler - wkhanna 10:44:44 11/15/14 (5)

RE: tube cooler - Caucasian Blackplate 10:56:47 11/15/14 (4)

RE: tube cooler - wkhanna 11:19:37 11/15/14 (3)

RE: tube cooler - Alex Kitic 23:35:38 11/15/14 (0)

RE: tube cooler - tubular.well 11:24:00 11/15/14 (1)

RE: tube cooler - wkhanna 11:41:23 11/15/14 (0)

RE: tube cooler - unclestu 07:25:56 11/15/14 (8)

RE: tube cooler - wkhanna 09:56:51 11/15/14 (7)

RE: tube cooler - unclestu 12:24:25 11/15/14 (6)

RE: tube cooler - Tre' 09:27:56 11/16/14 (5)

RE: tube cooler - unclestu 10:10:22 11/16/14 (2)

I'm going to assume..... - Tre' 10:24:51 11/16/14 (1)

I just measured the capacitance - Tre' 10:31:53 11/16/14 (0)

RE: tube cooler - Nunki 10:08:08 11/16/14 (1)

RE: tube cooler - Alex Kitic 14:39:20 11/16/14 (0)

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RE: tube cooler - Alex Kitic 14:39:20 11/16/14 (0)

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