[Amps] HV & temps

[Carl]

Cuz the amp is not designed to be loafed in the HV position, efficiency 
sucks do to the much different plate load.
The LV position is a bit more efficient.

Why are you loafing an 8877 for anyway? Drive it with 50W and tune for max 
in the LV position and then measure.

Carl
KM1H


----- Original Message ----- 
From: "Gary Smith" <Gary at ka1j.com>
To: <amps at contesting.com>
Sent: Wednesday, March 12, 2014 4:58 PM
Subject: [Amps] HV & temps


>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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