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In Reply to: I froze my Mpingo Discs last night...... posted by Sidegetter on August 13, 2002 at 05:12:55:
Follow Ups:
This I was aware of. Not sure how well it transfers in a freezer though.
"Nothing quite like high voltage DC to sharpen the mind and body!"
You have noticed that the pins generally located towards the bottom are connected to the nifty bits inside haven't you? :)
Yes, and I mentioned it in my initial post.....
"Nothing quite like high voltage DC to sharpen the mind and body!"
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.
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!"
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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