Tubes Asylum

Transfers just fine via direct conduction...

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David S.

(A)

In Reply to: You are correct...Light radiation posted by Sidegetter on August 13, 2002 at 09:59:43:

You have noticed that the pins generally located towards the bottom are connected to the nifty bits inside haven't you? :)

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Re: Transfers just fine via direct conduction... - Sidegetter 16:49:32 08/13/02 (3)
Yes, and I mentioned it in my initial post.....
"Nothing quite like high voltage DC to sharpen the mind and body!"
- Oops! Too right... I shouldn't have popped in mid stream :) - David S. 17:18:47 08/13/02 (2)
  Sorry about that.
  As to the heat transfer from pin to innards via rather fine connections... suffice to say that it would be sufficient in a proper cryo treatment. The equations to prove it are a bit more difficult to post in raw ascii text.
  - No problem, I'm just trying to understand this better.. - Sidegetter 19:03:43 08/13/02 (0)
    I can see where proper cryo-treating would potentially change things (whether it is good or bad I don't know), freezing them in ones freezer I don't believe is the answer. How long lasting is the treatment of a properly cryo-treated tube? Does it enhance the service life? I realize I made serious light of this whole thread, but is there serious documentation to support and confirm whether it is just a short lived change or a real long lasting improvement? Just looking for the answers to become a believer.
    "Nothing quite like high voltage DC to sharpen the mind and body!"
  - I think it's radiation, here's why... - Sector-7G 17:51:36 08/13/02 (0)
    when the tube is operating, most of the heat transfer is through radiation, goes as fourth power of absolute temp, delta T is about 180-200 K between operation temp of plate and surroundings. This is why a smaller EL34 plate is good for 25 W and the bigger KT88 is rated at 42 Watts. Sinking the thing in liquid N2 gives the same delta T between surroundings( the coooold liquid N2, and the tube's innards 270 K. of course some will be transfered through the pin connections, but look at how thick the connections are ( effective resistance ) and the mass of material bahind it ( model as capacitance ). anyway, just had to put in two Cents...
    regards,
    Douglas

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