[EMAIL PROTECTED] made an utterence to the drakelist gang ---------------------------------------------------------------------- Regardless of which type of filament it is the fact is that filament voltage is critical for maximizing tube life. Too little is probably worse than too much. You can try adjusting your primary line voltage to get as close as 12.6 volts of filament voltage as possible but then you have to take into account line voltage bounce and regulation. In this area it varies between 115 and 122.5 volts. > > Ron Wagner <[EMAIL PROTECTED]> made an utterence to the drakelist gang > ---------------------------------------------------------------------- > Folks, > I have read about two types of tubes: oxide cathode, and thoriated > tungsten. Just wondered, the 6JB6 would be oxide cathode (indirect > heater), and the thoriated would be something like an 811 (direct heater)? > Am I correct, or way out in left field? > > Article was in reference to heater voltage and extended tube life. Was > wondering if they applied to my Drake B twins. Thanks. > > 73, > Ron > > > ============================================================ > Visit my astronomy home page. http://www.dma.org/~wagner > Amateur Radio Station: WD8SBB - Ron and KB8NRP - Joann > ============================================================ > ---------------------------------------------------------------------- > On Behalf of Ron Wagner <[EMAIL PROTECTED]> > Submissions: drakelist@www.zerobeat.net > Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in > body > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: http://www.zerobeat.net > Brought to you courtesy of TLCHost.net http://www.tlchost.net/ > ---------------------------------------------------------------------- >
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