Eddie - or anyone who has the address for Henry Lewis,
please let me know and I will add is information to the sources of
parts etc. listed at:
http://www.af4k.com/mega/partsupp.htm
And if possible any web address at:
http://www.af4k.com/Boatanchors_Directory/Parts.htm
On 5 Oct 2004 at 18:41,
Can someone please clarify for me the plate dissipation ratings on
vacuum tubes. I am in the process of restoring a Stancor 60N that uses a
HK24 tube and the dissipation rating is about 25 watts. Isn't the 25 watt
rating Ep*Ip and is this a maximum value that should never be exceeded? I
Can someone please clarify for me the plate dissipation ratings
I believe this transmitter will put out 30 to 40
watts of carrier and if it were say 60 efficient wouldn't that bump up
the plate dissipation to around 65 watts exceeding the dissipation
ratings.
Based on what you've said,
Plate Dissipation is the energy loss in heat to the plate of a tube. If Ep
= 1000V and Ip = 100 ma = then the total plate input power is 100 watts. If
the tube is not doing any output but yet drawing the current then the input
power is all dissipated in heat = 100 watts. On the other hand if
Sure, Tom.
The efficiency of an amplifier is defined as its output power divided by
the DC input to the stage, or:
e = Po / Pi
If you get 40W out and have 60% efficiency, the input power is Po / e = 40
/ 0.6 = 67W. So the tubes dissipate the difference between input and
output power, or 67W -
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