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Author Topic: Ameritron AL-811H - Plate Voltage Drop  (Read 891 times)
KB8VUL
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Posts: 278




Ignore
« Reply #15 on: July 03, 2019, 09:42:20 PM »

On a tube amp there is going to be some sag in the plate voltage as the tubes conduct. 
Because it's a SSB amp it has to have some bias, so that is the initial drop when you key the amp and not apply RF.

As you begin to apply RF and the tube conducts more the drop is going to be more pronounced.

Thing to do is find the documentation on it and see what the expected RF output is on the amp.
I went ahead and looked it up
ALi811 is 600 watts
AL-811H is 800 watts

now depending on what watt meter you are using, that's about the max you are gonna get so if it's doing 500 or 700 depending on the amp you have it's fine.
remeber to follow the instructions on how to tune up the plate and load and have a big enough dummy load when using one to work with an amp.
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