[Amps] SWR increase on SB-220 input

[Joe Subich, W4TV]

> I'm presuming that I may have partially fried one of the capacitors
> in the amp's input circuit by operating it this far off the intended
> band. Does that make sense?

You could also have cooked the slug in the coil or warped the coil form
depending on the material.   There is a fair amount of circulating
current in those pi-networks when run off frequency.

73,

    ... Joe, W4TV


On 5/1/2012 9:38 AM, Pete Smith N4ZR wrote:
> I've been operating a lot of 18 MHz recently with my SB-220 set on 15
> meters, and I now notice that the input SWR on 15 is over 2:1, resulting
> in some exciter foldback and reduced output power.
>
> I'm presuming that I may have partially fried one of the capacitors in
> the amp's input circuit by operating it this far off the intended band.
> Does that make sense?  If so, where would you look first?
>