[Amps] OMPower OM2000+ Tuneup
hamradio at mailme.dk
hamradio at mailme.dk
Fri Oct 20 04:26:41 EDT 2017
Hi.
I just bought an OM2000+ amplifier from OM-Power.
The amplifier are running flawlessly and I enjoy the easiness and quality.
The tune up are pretty simple and I am sure I do it the right way, to
ensure good and right tune of the amplifier.
But now I am start wondering if I can do it even better.
The tune procedure is straight forward. Use Tune knob for maximum output.
And Load knob to insure the I mark is inside the boundaries. The display
will show > I < when the Load knob is adjusted correctly.
But
Sometimes the Load knob can be adjusted quite a lot, and still be inside
the boundaries.
I can then choose to set the knob in the middle of the two boundaries points.
I think this is the way it should be done.
But then I start wondering about the grid and screen current under this
tuneup sequence.
Will these two values help me find exactly the right spot?
I am not a tube expert and only know the basic things.
The amplifier uses a Tetrode called FU-728.
As I understand it, the grid current will normally be close to 0 mA for my
kind of operation using output power about 1000 W or less.
But the 2. Screen will vary a bit during the tuneup.
It will accept up to 50 mA of screen current, but mostly I see the value
be in the 0 to -15 mA ranges at my power levels.
So the question is now:
Can I use the 2. screen current (or maybe the Grid current) to make a
more precise fine tuning of the amplifier than the broad > I < mark can
provide?
Of course I will never go outside the > I <, but I still have some
adjustment window inside the boundaries.
Has anyone any thoughts or tips regarding this matter?
Thomas / OZ1JTE (Denmark).
More information about the Amps
mailing list