Original poster: "Gerry Reynolds by way of Terry Fritz <teslalist-at-qwest-dot-net>" <gerryreynolds-at-earthlink-dot-net> Hi group, What is the criteria for choosing whether to go LTR or STR vs spark gap (static, ARSG, SRSG), and power source (neon 12KV or 15KV, 30ma, 60ma, 90ma, 120ma, PDT). I know, its a hugh matrix. Thanks Gerry R. Ft Collins, CO