[NJARC] Hi, Guys. What am I looking at here?

Sun Mar 15 19:07:32 EDT 2009


hi all , my 2c/  whatch your street lites at nite. as they fail they make all kinds of noise out here on long island. a call to your local town liteing office and they will fix . see ya paul kc2lev
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--- On Sun, 3/15/09, John Ruccolo <jr6v6gt at yahoo.com> wrote:

> From: John Ruccolo <jr6v6gt at yahoo.com>
> Subject: Re: [NJARC] Hi, Guys. What am I looking at here?
> To: njarc at mailman.qth.net, "Dave Sica" <davesica at juno.com>
> Date: Sunday, March 15, 2009, 2:47 PM
> Just remember 
> Reply = Poster
> Reply All = Everyone
> 
> _________________________________________________________
> 
> Dave,
> 
> I emphasized heater/cathode *leakage*, not necessarily a
> short. If there was a short, you would have very high hum
> levels (it would sound like bad filter caps). 
> 
> One possible clue to H/K leakage was that the hum worsened
> as the day went on.
> 
> 50C5's and 35W4's are prone to the H/K leakage
> problem. Try swapping each one out, AND the 12AV6 as well.
> 
> I just don't get the behavior of the volume control....
> 
> All kidding aside, I think it's great that young people
> are interested in stuff like this.
> 
> 
> JR
> 
> --- On Sun, 3/15/09, Dave Sica <davesica at juno.com>
> wrote:
> 
> > From: Dave Sica <davesica at juno.com>
> > Subject: Re: [NJARC] Hi, Guys. What am I looking at
> here?
> > To: njarc at mailman.qth.net
> > Date: Sunday, March 15, 2009, 12:41 PM
> > Just remember 
> > Reply = Poster
> > Reply All = Everyone
> > 
> >
> _________________________________________________________
> > 
> > On Sun, 15 Mar 2009 07:27:19 -0700 (PDT) John Ruccolo
> > <jr6v6gt at yahoo.com>
> > writes:
> > 
> > Thanks for the suggestions, all.  I'm looking
> into it
> > but haven't nailed
> > anything down yet. Anyone with any other ideas while
> I'm at
> > it?
> > 
> > > 1) Tell the young lady to forget it and buy an
> Ipod!
> > (like everyone 
> > > else her age)
> > 
> > I had suggested that she get one of those USB
> turntables so
> > she could
> > play the 78s into her iPod. She made it clear that
> actually
> > spinning the
> > scratchy vinyl (or in her case it's the shellac
> she likes)
> > was the
> > experience she was looking for. 
> > Aren't you just charmed by that?
> > 
> > > 2) Does the behavior change when you reverse the
> AC
> > line plug? 
> > 
> > That's the first thing I tried, along with
> shutting off all
> > the
> > fluorescent lights and dimmers. No luck there.
> > 
> > > 3) It may be that the volume control just needs
> more
> > cleaning. 
> > 
> > Since the volume control is relatively noise-free AND
> this
> > noise spike
> > raises and lowers smoothly as the setting of the
> volume
> > control is
> > changed I'm pretty confident a dirty pot is not
> the
> > issue.  The fact that
> > the noise goes DOWN first, nulls out and then raises
> as you
> > rotate the
> > volume control clockwise still has me scratching my
> head
> > though.
> > 
> > > 4) Is there a preamp stage (like a 12AV6 or
> something)
> > before the 
> > > 50C5? 
> > 
> > There is a 12AV6 preamp. I'll poke around in
> there.
> > 
> > > 5) Possibly the cartridge wiring? 
> > 
> > Aaron said "Make sure the connections at the
> cartridge are
> > tight and
> > wires properly 
> > soldered and not broken. The leads can act as an
> antenna.
> > "
> > 
> > This strikes me as perhaps the most likely culprit
> based on
> > what I'm
> > hearing. And it's definitely not something I
> thought to
> > check before.
> > Thanks, Aaron.
> > 
> > > 6) Try swapping out each tube one-at-a-time -- I
> > wonder if you could 
> > > have heater/cathode leakage somewhere? If there
> was a
> > H/K *short*, 
> > > however, I would expect a LOT more HUMMM.
> > 
> > The 60 cycle hum is not really objectionable. This
> morning,
> > the buzz is
> > also a lot less noticeable. Probably back to the level
> it
> > was yesterday
> > during the day when I couldn't really even notice
> it at
> > normal playback
> > levels.  I wouldn't expect a short here to
> generate or
> > allow primarily
> > the HF noise to get through but someone please correct
> me
> > if I'm wrong
> > about that.
> > 
> > Darren suggested H-K arcing. I'd be surprised if
> there was
> > enough
> > potential there to strike an arc, plus this is a VERY
> > regular pulse, not
> > random at all as I would expect an intermittant short
> to
> > sound.
> >  
> > > As a vinyl collector for over 30 years, are you
> > telling me now I 
> > > have to compete with people MUCH LESS than half
> my
> > age? Sigh....no 
> > > wonder I'm not finding anything at the local
> > second-hand store.
> > 
> > Much, much less than half your age and very very into
> this.
> > Hey, we talk
> > about encouraging young people to get into aspects of
> our
> > hobby. Now be
> > careful what you wish for!
> > 
> > Thanks,
> > --Dave
> >
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