Chris,
It sounds to me that you're planning to use the SCR to replace the spark
gap. The tank will ring down while the SCR is turned *on*. The SCR will
extinguish when the energy rings down sufficiently. If this is what you
plan, it's not a new idea. I've used SCR's in this way in Tesla coils,
Lou B. has done it, Malcolm W. has done that and probably others too.
Terry's SISG coils use the same concept except he used an IGBT which
is kept on during the transfer time. The overall concept being that the
solid state
device is not switched at the RF frequency, but rather at the break-rate
frequency.
John