In a message dated 09/04/2005 11:59:22 GMT Standard Time, joefran at camline.net.mt writes: I like to fing a circuit diagrm of HT regulated power supply of 250 volts using 6080 tube..... ARRL handbooks 1951 to 1964. Some have 6AS7 instead of 6080, but for all intents and purposes, they are the same. 73 Peter G3RZP