Home Tubes Asylum

Questions about tubes and gear that glows. FAQ

I think it's radiation, here's why...

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


This post is made possible by the generous support of people like you and our sponsors:
  Kimber Kable  


Follow Ups Full Thread
Follow Ups
  • I think it's radiation, here's why... - Sector-7G 17:51:36 08/13/02 (0)


You can not post to an archived thread.