[Amps] sb-220 tuning question - closing in

[Phil Clements]

> Isn't this all getting a little over-complicated?  If both tune and
load
> controls are adjusted for maximum output at rated drive (~100
watts), there
> should be no arcing and performance should be nominal.  If you want,
add a
> little loading (clockwise) past peak output for better IMD

That's not the only reason I add a little loading past peak. I watch
the grid current and tweak the load control until the grid current
drops c. 10%. This costs you very little power output while giving
extra headroom to the grid-trip circuit, and decreases grid
dissipation a bit. This phenomina is really evident on 8877(s). Your
mileage may vary with glass bottles.

(((73)))
Phil, K5PC