peter 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. I get 1kw out on 15 meters and 20 meters. Is
my plate choke resonating about 18 mhz ?
No, not if it´s the original Heath choke.
However if I don´t remember wrong I have the band switch
in the 20m position when I use it on 17m, you might just
check it out.
No problem to get 1 kW out on all the WARC bands.
Any help would be appreciated.
Peter
KC0NYG
73 SM2EKM
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