don p whitaker wrote: > Johnson Vikeing Thunderbolt (HF) used the 400Z's also > Don K8OMO The T'bolt used 4-400s and not 3-400s > also there was a vhf/uhf version Yes, the 6N2 Thunderbolt and while I'm not positive, I think it used a pair of ceramic tubes 4x150A/7034. Ken K4XL _______________________________________________