[Amps] sb-220 on 17 meters
lecutis2 at netscape.net
Mon Feb 23 21:21:04 EST 2004
Thanks for the help.
So Mr. Measures asked the following question as seen below. So I tune
up to find the answers. Mind you I just installed a vhf parasitic kit
I now get decent output with no extra heat or filament glow. Tubes are
weak so take outputs with this in mind.
Input Swr 1.0:1
Plate amp. 0.6
Grid millamp 210
output swr 1.4:1
exciter watts 84
output 775 watts
Two conclusions. Its an intermitant problem or the parasitic kit
Maybe human error but I doubt it. I tried tuning it up on two different
days. With the same low power out on both days.
"R. Measures" <r at somis.org> wrote:
>>I recently aquired a sb-220. When I try to tune up the amp on 17 meters
>>using the 15 meter band switch I get only 300 watts out and both tubes
>>really are working hard.
>** What is the plate/anode current reading with key-down/AØ emission on
>the CW tap? What is the input SWR? Tnx
>>I get 1kw out on 15 meters and 20 meters. Is
>>my plate choke resonating about 18 mhz ? Any help would be appreciated.
>>Amps mailing list
>>Amps at contesting.com
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