[Amps] 200-ohm tank and "un-un" in HF amp design?

[Bill Turner]

ORIGINAL MESSAGE:          (may be snipped)

On Sun, 20 Oct 2013 00:51:44 -0700, N7CXI wrote:

>Assuming adequate core/wire sizing and airflow, can anyone think of a 
>solid reason *not* to design a legal-limit HF amp output tank for 200 
>ohms, then use a 4:1 "un-un" transformer to step it down to 50?

REPLY:

If the only reason to do this is to use a smaller load capacitor, I would
suggest instead to switch in some doorknob type padder caps instead. IMO, a
pi-net is a better impedance matcher than a transformer. Lower loss, less
cost, more reliable. Designing a broadband transformer is tricky business, a
pi-network is relatively easy. 

73, Bill W6WRT