[Amps] SB-200 input.

Tom Osborne w7why at frontier.com
Thu Jul 24 13:11:25 EDT 2014

Hi All

I was reading an article in an older QST about doing a conversion on a 

One of the things they did was take the tuned input out and put in a 4:1 
toroid on the input, as the input impedance of the 572B's is around 200 
ohms.  The article said the SWR was around 1.5:1 with this setup.

Is this a good thing to do?  Sure would save a lot of fiddling around 
tuning the input.  73

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