[AMRadio] HRO question for the day


Bernie Doran qedconsultants at embarqmail.com
Thu Dec 17 16:40:14 EST 2009


Interesting idea, as in boiling off fewer electrons to pile up around the 
cathode? not clear to me what effect that would have one way or another.
----- Original Message ----- 
From: "ROLYNN PRECHTL K7DFW" <k7dfw at clatskanie.com>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Thursday, December 17, 2009 3:19 PM
Subject: Re: [AMRadio] HRO question for the day


>
>> > 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.............
>
> ==================================
>
> Perhaps it is for this reason, a method that is used in some other diode
> circuits.
>
> The resistor in series with the filament reduces the no-signal d-c level 
> on
> the output. The no-signal d-c level is caused by the tube contact 
> potential.
> If not reduced it may cause a delay voltage to be present.
>
> Maybe, maybe not. My WAG.
>
> Back to spending my wife's inheritance.
>
>
> K7DFW
>
>
>
> ..._._
>
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