Go here for a schematic... http://www.worldwidedx.com/amplifiers/96435-elecraft-kpa500-high-frequency-amplifier-manual-schematics.html Chuck, KE9UW ----- Chuck, KE9UW -- View this message in context: http://elecraft.365791.n2.nabble.com/My-KPA500-has-no-270v-tp6897042p6897755.html Sent from the Elecraft mailing list archive at Nabble.com.