[NJARC] Buzzzzzzzz

[Scott Roberts]

Further info-
I swapped the 75 tube with another I have marked
"NFG",  and it seems about the same- but that may just
be the tube...

Also, the sound is a bit gravelly- sort of like
someone with one of those voice box vibrators after a
laryngectomy...

Scott


--- Scott Roberts <ng19delta at yahoo.com> wrote:

> Visit our web site - See http://www.njarc.org
> _______________________________________________
> Hi John-
> Thanks for the reply: the I.F. Amp tube is a 6D6,
> and
> I only have a check mark down for it, which may
> indicate I tested it, with no remarkable result... I
> have the same mark next to the L49B ballast... (It
> is
> an AC/DC set) I am thinking along the sensitivity
> side
> of the house as my problem.
> 
> As to NFG" is is military, aviation and many others
> for No F..., er "Flippin" Good... Means the tube
> tested lousy at some point when I tested it... ;)
> 
> Scott
> 
> 
> --- john ruccolo <jr6v6gt at yahoo.com> 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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