Re: [Harp-L] Did I fry my ART Tube MP pre-amp wall wart



I kind of doubt that forcing the plug into the DD-3 could physically damage
the tip of the plug. More so, the probablility is that the tip may have
damaged the jack on the DD-3 than the opposite. Those tips are pretty
sturdy.

There IS the possibility of burning out the secondary, in spite of the fact
that the voltage is only 9V. It's not about the voltage, it's about the
current, and given the possiblility that they may have used a fine wire on
the secondary, it could have created such a current flow in the secondary as
to have melted the wire, depending on the size of the wire. The finer the
wire they use, the more money they save in copper, you know. It just seems
logical that they would not want to waste money on excess copper in
conductors that don't need it. When you short the secondary in a
transformer, it creates a very high current, with little resistance, as
opposed to driving that same current through a load, which is what it's
designed to do.

BL
----- Original Message ----- 
From: "steve warner" <10reedsbent@xxxxxxxxx>
To: "harp-l" <harp-l@xxxxxxxxxx>
Sent: Sunday, March 30, 2008 4:04 PM
Subject: Re: [Harp-L] Did I fry my ART Tube MP pre-amp wall wart


> This is my first post in many months.  Howdy everyone!  I'm back with all
my
> fat tone microphone secrets intact.
>
> Mike,
> If what you say is exactly what happened then I give you the following:
> I believe you damaged only the plug tip.  You forced the plug into the
> DD-3's input and you damaged it and that's why your MP doesn't light up.
> There's no reason your ART MP should be damaged because your DD3 did not
> ''create'' a sudden surge of bucking 9+ DC volts to fry the secondary on
the
> adapter's transformer.  Impossible.
>
> >From what you described  It's likely that you've  pushed in the positive
tip
> inside the plug....broken in other words .  Do what Bob said and get a
> replacement plug from the electronic supply house and never plug in
> something that doesn't fit.  Of course match the voltages, but try and
match
> the mA rating....(tha'ts milli-amp).
>
>
> On 3/30/08, Bob Laughlin <rlaughlin@xxxxxxxxxxxx> wrote:
> >
> > Okay,,my turn,,haha
> >
> > I've been an electronics enthusiast, via amateur radio, AND an
electrician
> > by trade, for 25 or so years, so, on a limited basis I know what I'm
about
> > to say:
> >
> > First, since the power supply doesn't work on the ART Tube MP pre-amp
> > anymore, you probably did damage to the power supply, rather than the
> > pre-amp.
> >
> > Before plugging, or even unplugging the power supply from this or that,
it
> > should be unplugged from the wall, ideally. If, while plugging or
> > unplugging
> > these things into this or that, the tip shorts to the shell (of the 9V
> > plug
> > end), it could possibly damage the windings of the transformer, making
it
> > unusable. That's probably what happened. A transformer has two sets of
> > "windings", or "coils", one in proximity to the other, transferring
> > electrical power, through the principle of inductance
> > (http://en.wikipedia.org/wiki/Inductance), to the other coil, e.g.,,from
> > the
> > wall plug end to the 9V plug end. During this transfer, the voltage is
> > changed, to make it applicable to whatever you're using,,the delay
pedal,
> > the pre-amp, etc.
> >
> > Also, before trying this, after unplugging from the wall, you should
have
> > gotten a hint from the fact that the plug didn't fit, to simply give up
> > the
> > attempt. When something doesn't fit, physically, it usually won't work,
> > electrically, and may damage whatever you're working with.
> >
> > Next, the voltage specs are generally written on the power supply, but
> > this
> > doesn't account for polarity, i.e.,,which is positive and negative, the
> > tip,
> > or the shell, on the plug. This could be tested with a small voltage
> > tester,
> > known as a "VOM" (Volt-Ohm-Milliameter), or "Multimeter", if you know
how
> > to
> > use one. I'm not entirely sure whether the tip is always positive, or
the
> > shell, or whether there are variations. In my years of electrical work,
> > you
> > ALWAYS find variations, so caution is paramount, if you wish to avoid a
> > catastrophe.
> >
> > But still, the fact that the plug didn't fit,,that's the big one. "If it
> > don't fit, you must acquit,," (Oh wait,,that was the "OJ" trial,,). If
it
> > don't fit, just quit, or maybe your equipment will go to sh**. NEVER
force
> > things. If they don't SEEM made for each other, they probably aren't.
> >
> > As was posted already, you can probably find a "universal power supply"
at
> > a
> > local "Radio Shack" store, or electronics supply house. You have to be
> > clear
> > what voltage you're getting from the wall socket, 120, or 230, or
> > whatever,,and what voltage you wish to derive from the power
adapter,,9V,
> > or
> > whatever. That's crucial. Then, you have to have the right plugs, on the
> > wall end, AND on the equipment end. The universal supply often comes
with
> > a
> > multi-ended adapter, with which one may find the right plug to go to the
> > equipment.
> >
> > Once having worked out these details,,the voltages, and the plugs,
there's
> > still the matter of polarity.
> >
> > It's always best just to get a replacement supply from the company that
> > makes the equipment.
> >
> > BL
> >
> >
> >
> > ----- Original Message -----
> > From: "M. N." <mnessmith@xxxxxxxxxxx>
> > To: "list harp" <harp-l@xxxxxxxxxx>
> > Sent: Sunday, March 30, 2008 12:43 PM
> > Subject: [Harp-L] Did I fry my ART Tube MP pre-amp wall wart
> >
> >
> > >
> > > Tonight I was monkeying around with my new ART Tube MP pre-amp,
running
> > it
> > into my little tube amp and loving the sound. I decided to switch gears
> > and
> > try out my BOSS Digital Delay DD-3, which I haven't used in awhile. It
> > didn't have a battery in it and, rather than scrounging around to find a
> > 9v
> > battery, I just unplugged the power cord for my ART Tube MP and plugged
it
> > into the BOSS Digital Delay DD-3. The plug itself didn't quite fit (is
too
> > long), so I pulled it out and popped it back into the Art Tube MP
pre-amp.
> > Result? No lights on the ART Tube MP, and no sound. No nothin.
> > >
> > > I'm afraid I did something really dumb and am now going to pay a
stupid
> > tax.
> > >
> > > Here's what the ART Tube MP pre-amp's wall wart says: INPUT:
230V~50Hz,
> > and under that: OUTPUT: 9V~1000Ma. (I am in Europe, btw, that's why the
> > 230V.)
> > >
> > > Here's what the sticker on the back of the BOSS Digital Delay DD-3
says:
> > 230V .... PSA-230 (9V DC)
> > >
> > > Any guesses on what this Einstein did?
> > >
> > > MN
> > > _________________________________________________________________
> > > Test your Star IQ
> > > http://club.live.com/red_carpet_reveal.aspx?icid=redcarpet_HMTAGMAR
> > > _______________________________________________
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>
>
>
> -- 
> steve
> www.thunderharpmics.com
> fattest tone on earth!
> _______________________________________________
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