[Amps] HV & temps

[Gary Smith]

I have started working RTTY for the first time in 25 years (sending 
using the CW paddle & having the K3 convert it to RTTY). I thought 
I'd use the amp to give me a better signal and take it very easy on 
the K3. I have a temperature probe in the air exhaust and it tells me 
when the tubes are heated enough to fry an egg or not.

I had the amp set for 300 watts output using the higher volt setting 
of 3,800V and saw the exhaust temps closing in on 180F pretty 
quickly. After fiddling with the load plate settings I ended up with 
pretty much the same results of high temps with low output power.

I then tried with the voltage in the low HV setting of 2,600V and for 
the same 300 watts out, it takes a whole lot longer to get to a 
higher temp.

Why would this be? With the higher V it takes less current & with the 
lower volts it takes higher current to get the same wattage. Why does 
using the higher voltage setting result in a hotter exhaust?

Gary
KA1J

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