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
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