>I have the RFPP HF1000G amplifier purring along here, in daily
>operation now. It was a very good find and I am quite impressed with
>the ruggedness of the componentry and general spaciousness of the RF
>compartment.
>
>As Phil Clements noted, the choke input original HV filter limits it
>to about 2650 VDC in the stock machine. So the max RFout I can reach
>before serious saturation is about 1100 W. I run it up to 1200 with
>no ill effects, but it is NOT considered linear anymore. I ran power
>sweeps with the 8753E network analyzer Thursday, and the gain does
>change over the range of power.
>
>The choke input supply bounces as we sweep the rf drive with our
>network analyzer, and this can be seen at the beginning of the sweep
>as a little hickup. Going to Cap filtering only would improve this,
>although step start would be required as well as an appropiate 5-20
>ohm series resistance to the tube to limit energy in case of a flash
>over somewhere.
How about resonant-choke filtering?
>
>Our 1000G...
- Rich..., 805.386.3734, www.vcnet.com/measures.
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