Hi Al- Radio is a Motorola 61A (Nostalgia Air
schematic
http://www.nostalgiaair.org/PagesByModel/711/M0006711.pdf)
I'm attempting to align it now- hope I remember
correctly how you showed me! Should I connect the
output leads on the speaker connection, or the hot
side of the audio transformer?
Thanks!
Scott
--- Al Klase <al at ar88.net> wrote:
> Visit our web site - See http://www.njarc.org
> _______________________________________________
> > I concur with John on low sensitivity. However,
if
> signal is stronger
> at the 6A7 (converter) grid than the antenna
> terminal, then the problem
> is upstream from that point, i.e. RF amp or antenna
> circuit, rather than
> downstream in the IF or audio.
>
> Must say I lost track of which radio was involved.
>
> Try using a transistor portable set to track down
> the source of your
> Buzzzzz. (Was that enough Z's?)
>
> Al
>
> john ruccolo wrote:
> > Visit our web site - See http://www.njarc.org
> > _______________________________________________
> > Hi Scott,
> >
> > I too am a proud member of "The 700 Club." That
> is,
> > buzz below 700 KC (in my case I think it goes
> higher).
> > Harry is right on -- one culprit is night sensors
> on
> > our outside spotlights, I proved that recently.
> >
> > Listen carefully -- don't confuse low *volume*
> with
> > low *sensitivity*. If it sounds nice and LOUD when
> you
> > put your finger on the cap of the 75, then volume
> is
> > not the issue. But it sounds from your description
> > like it is a sensitivity issue.
> >
> > Low sensitity can be caused by lots of things --
> you
> > may be on the right track with the 6A7. My prime
> > suspect, however, would be the IF amplifier tube,
> or
> > its associated components. What kind of tube is
> that?
> > Swap it out if you have a spare.
> >
> > I'm not familiar with the term "NFG." Is that a
> > military term? ;-)
> >
> >
> > JR
> >
> > --- Scott Roberts <ng19delta at yahoo.com> wrote:
> >
> >
> >> Visit our web site - See http://www.njarc.org
> >> _______________________________________________
> >> Harry- Thanks for the reply. I tried adding a
> filter
> >> to the line in, but no joy.
> >>
> >> Everyone-
> >>
> >> Today I pulled the tuning rack, and gave it a
> good
> >> cleaning, also blew the dust out of the coil
> cans,
> >> and
> >> trimmers... Now I have to tighten up the
> >> realignment:
> >> I did a rough one based on a strong local
> station,
> >> but
> >> need to fine tune, so to speak...
> >>
> >> I find if I touch my finger to the grid cap on
> the
> >> 6A7
> >> "Osc. Mod." tube, the signal picks up immensely:
> If
> >> I
> >> touch the end of the connected "hank antenna"
> line,
> >> it
> >> picks up, but not as much... I had the tube
> marked
> >> "weak" in my notes, and I think this confirms the
> >> idea...
> >>
> >> Also, marked "NFG" in my notes is the 75
> "DET.-AVC
> >> -A.F." tube... If I put my finger on the grid
> cap,
> >> the
> >> buzz picks up quite a bit.
> >>
> >> The 25Z5 tube is loose in its base(not socket)
> >>
> >> The radio is working, but weak, unless I am
> holding
> >> the antenna line. I am wondering if the tho tubes
> >> (6A7
> >> & 75) could be the problem...
> >>
> >>
> >>
> >>
> >
>
http://search.yahoo.com/search?fr=oni_on_mail&p=summer+activities+for+kids&cs=bz
> >
> >>>> _______________________________________________
> >>>> NJARC mailing list
> >>>> NJARC at mailman.qth.net
> >>>> http://mailman.qth.net/mailman/listinfo/njarc
> >>>>
> >>>>
> >>>>
> >>> :Hi Scott,
> >>>
> >>> Well, all of my radios buzz zzzzz below about
> 740
> >>>
> >> or
> >>
> >>> 730 or so. I don't
> >>> know exactly what devices
> >>> in the house do it, but it's a common problem.
> >>>
> >>> Maybe light dimmers, or florescent lights or -
> >>> something. One of these
> >>> days I'll track it down.
> >>>
> >>> Meanwhile, you're not alone.
> >>>
> >>> Harry K
> >>>
> >>> _______________________________________________
> >>> NJARC mailing list
> >>> NJARC at mailman.qth.net
> >>> http://mailman.qth.net/mailman/listinfo/njarc
> >>>
> >>>
> >>
> >>
> >>
> >>
> >
>
____________________________________________________________________________________
> >
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> >>
> >>
> >
> >
> >
> >
> >
>
____________________________________________________________________________________
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> >
>
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>
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> >
> >
> >
>
> --
> Al Klase - N3FRQ
> Flemington, NJ
> http://www.skywaves.ar88.net/
>
>
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>
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