Posted by
Charles Greene-2 on
Mar 08, 2006; 6:42pm
URL: http://elecraft.85.s1.nabble.com/Driving-a-linear-with-only-15-watts-tp387374p387375.html
Darwin,
I have a linear that has about 1000 watts output when driven with
approx. 60 watts in class AB2 for CW and a little more when operating
class AB1 for SSB. It's an old Hallicrafter HT33A with a PL172
pentode amplifier tube. I tried it using my K2/100 on PSK31 with 20
watts average power from the K2/100. The amp put out 400 watts ave
power. The IMD coming out of the amp was identical to the IMD of the
K2/100 without the amp, indicating no more distortion was added by
the amp. I don't expect you to hunt for a HT33A, but the principles
are the same. The efficiency is lower because of the idling power,
but since it is all coming out of the power line, who cares?
73, Chas W1CG
At 11:13 AM 3/8/2006, Darwin, Keith wrote:
>Since a linear amp is supposed to be "linear", is there any reason that
>you have to run 65 to 100 watts into one? What if you used a linear
>designed for 65 watt drive and only gave it 15 watts? Does the spectral
>purity change? Does the efficiency drop? Does the linearity degrade?
>
>- Keith KD1E -
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