> National decided in the HRO50 design to use a 4.3 Ohm resister in series > with the fil of both 6H6 dual diodes, ( noise blanker and detector) > dropping the fil to about 5 v. In the Hro 50-1 the noise blanker 6h6 > operates at normal Volts and the detector still at reduced voltage. I see no > reason for this and the tube data sheets do not address lower volt > operation. only effect I notice is that it takes several minutes for the > detector to warm up and produce audio. It can not be for life as when this > was designed and built 6h6s were cheap, still are. certainly not to save > energy or battery operation. perhaps it fools the detector into something > other that a square law detector due to low emission. tube life would be > extended, but so what, this is not a transmitting valve and the only one I > have seen where reduced voltage is recommended for standby is the 813, data > recommends 8 volt when on standby and I have never done that or seen one > used that way. So does anyone KNOW why national did this? I have never > seen this in Collins so it must be wrong!!!! HI Bernie W8RPW
I vaguely recall having the same question years ago when I was helping Roger, N4IBF(SK) with his, and learning that the resistor was there for a good reason, but I don't have a clue what it was now. Hopefully someone will have the info. Don ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
