>>>Why does my power output top out at 800 Watts? Once I get over 60 watts of
>>>drive, I get no more power out no matter what I do.
>>? Sounds like a tuned input problem. What is C1?
? The input C on the Pi.
>Interesting. I forget what C1 is. I would have to check. I have thought
>it might be a problem given the fact I am using slug tuned coils. Perhaps
>the slugs start to saturate. The 10m input SWR isn't perfect right now,
>but is under 2:1. I need to adjust the slug a bit. But what does flat
>topping have to do with the value of C1.
Flattopping has to do with not enough peak cathode emission to go with
load presented to the tube by the tank.
>>>The current will
>>>change depending on what amount of drive you have applied to the amp. So
>>>I what I think you are saying is that you would need to drive the amp so
>>>that the plate current is at 0.8 A. But then if you decrease the drive,
>>>you would change the impedance and hence the match. Correct?
>>? yes x 3. The guy who wants to take it easy on his linear amp. and
>>tunes up with reduced drive, gets a mistune every time. . .
>Well, correct. However, I was taught to tune it up initially with low
>power and then gradually crank up the power, tune it, crank the power
>more, tune it, etc. until you get to full desired output power and then do
>a final tune job on it.
Tuning-up one time at full-throttle saves time. Tuning up at low power
wastes time. Amplifiers are designed to work at full-throttle.
- later, Jon
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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