[AMRadio] Ghost from the 30's

[Ken Sands]

Good luck Rob!
Ken

On Thu, Jun 2, 2011 at 3:12 PM, Rob Atkinson <ranchorobbo at gmail.com> wrote:

> not sure--the problem is in all manner of receivers here--GE
> Superadio, Grudig Yachtboy (both operating off
> batteries)...TS870...when I operate the AA5 elsewhere it works FB.  I
> think the problem is local somehow and not with the recievers.  I'll
> have to start by killing the service to the whole house and see if it
> goes away.
>
> Rob
> K5UJ
>
> On Thu, Jun 2, 2011 at 2:05 PM, Ken Sands <ken.sands at cavtel.net> wrote:
> > Rob,
> > You have "re-radiated" signal from the power lines at your QTH,....
> > Happens to me as well especially on an "all american five" type radio.
> > Putting ferrite cores on the a.c. line going into the radio will reduce
> it,
> > but NOT eliminate it.
> >
> > Just my 2 cents.....
> >
> > Ken K8TFD
> >
> > On Thu, Jun 2, 2011 at 2:14 PM, Rob Atkinson <ranchorobbo at gmail.com>
> wrote:
> >
> >> I have been working on an Admiral AA5 receiver built in 1951 or 52 and
> >> has the larger octal tubes.   I have it working FB but it, and other
> >> AM bc band receivers at my QTH have a curious modulated hum problem
> >> below around 900 to 1000 kc.  There is 120 cycle hum pickup that seems
> >> to mix with the local oscilator and received station into the 455 kc
> >> IF.  I know it is not any one rx because I get it even with my newer
> >> battery powered GE Superadio.  I am guessing there is a ground loop
> >> somewhere in the house but if anyone else has had this problem I'd
> >> like to know what the fix was as it might save me a lot of time by not
> >> pursing dead end leads.
> >>
> >> p.s. Charlie, have not seen any prints in mine but it has a nice brown
> >> bakelite case--my late 50s ones are plastic.
> >>
> >> Rob
> >> K5UJ
> >>
> >> On Thu, Jun 2, 2011 at 11:30 AM, CL in NC <mjcal77 at yahoo.com> wrote:
> >> > I was working on a Motorola All American 6 AM BC RX, this from the
> late
> >> 30's or early 40's that had the additional RF amp stage for the 6th
> tube.
> >>  The bakelite cabinet had a chunk knocked out of it, and I was
> positioning
> >> it to see how it would slide back in the gap when it had epoxy on it.
>  On
> >> the inside of the broken piece, were the fingerprints of the person who
> >> painted the cabinet.  Not starkly evident, but ghostly visible in the
> same
> >> original eggshell color as the outside of the cabinet.  The prints were
> very
> >> small, fairly sure it was a woman, as I think child labor laws were in
> >> effect by then.  You have all opened up an old rig and seen fingerprints
> >> left on chassis from the oils on skin.  It's like a "Kilroy was here"
> >> calling card inadvertently left for the owner of the old treasure to
> wonder
> >> about the folks who have handled things over all the years.
> >> >
> >> > Charlie, W4MEC in NC
> >> ______________________________________________________________
> >
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