On 5/4/2020 6:53 AM, John Simmons wrote: > Nowadays manufacturers use 'ICAS'. One even specs their amp for '100% > duty cycle ICAS'. ICAS=Intermittent Continuous Amateur Service'. > Gobbledegook! Not really. ICAS and CCS have been used by power tube mfrs longer than I have been reading their data sheets in the '50s. 73, Jim K9YC