[NJARC] Cleaning metal fragments out of a radio tuner

[David Sica]

Limit current as you suggest, or perhaps just discharge a cap for more
instant oomph but limited opportunity for damage?

-- Dave

Sica Productions
732-382-0618
973-873-6347



On Fri, Jan 13, 2017 at 1:11 PM, <antqradio at sbcglobal.net> wrote:

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> I have actually done this on one radio's tuning capacitor a few years ago;
> the coolness factor is undeniable.  Whenever you hear crackling from the
> loudspeaker when you tune across the band, you will need to do this.  Al's
> advice on removing all connections to the cap is appropriate.  No need to
> do any damage to other parts of the circuit.
>
> I also suggest that you limit the current from the power supply to a level
> that will protect both you and the capacitor.  Whatever the voltage that is
> available from the power supply you use, calculate the value of a
> resistance, of appropriate wattage, to go in series with the power supply
> to limit it's current to 100 mA or less.  If the debris in the capacitor
> cannot be cleared by this reduced current then it is certainly big enough
> to see and be removed with tweezers or strips of paper soaked in a solvent
> like alcohol.  You will need to let the alcohol evaporate before you
> continue with the process.  No need to set the place on fire!
>
> This procedure is of course dangerous to life and limb so my Air Force
> tech training kicks in.  I suggest that you remove watches and rings and
> put one hand in your pocket!  Then sit back, away from the setup, and watch
> the fireworks!
> Jim
>
>
> ------------------------------
> *From:* Al Klase <ark at ar88.net>
> *To:* njarc at mailman.qth.net
> *Sent:* Friday, January 13, 2017 11:09 AM
> *Subject:* Re: [NJARC] Cleaning metal fragments out of a radio tuner
>
> Matt,
>
> You're right.  It's absolutely imperative that you disconnect the stator
> of the variable cap from EVERYTHING else.  Other wise you'll likely burn up
> the coil associated with it.  Also, you need a power supply that doesn't
> mind a short circuit on its output.
>
> I read about this in old books, but never saw it done.  Thanks, Bob.
>
> Al
>
> On 1/13/2017 11:42 AM, Matt Reynolds wrote:
>
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> Reply = Poster
> Reply All = Everyone
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> _________________________________________________________
>
>
>
> For the ignorant out there that barely know how to work on this stuff
> (me), is this dangerous to the rest of the set?  Like Victor said, it's not
> defined how its' hooked up (but I'm assuming one side is hooked up to the
> plates that move and the other to the stationary plates).  I assume this
> would only be a good idea on "hollow state" stuff...
>
> Regardless of any of that, it was cool to watch and looks like fun...
>
> Matt
> ------------------------------
> *From:* NJARC <njarc-bounces at mailman.qth.net>
> <njarc-bounces at mailman.qth.net> on behalf of VICTOR BELLINI
> <pipiepiper at gmail.com> <pipiepiper at gmail.com>
> *Sent:* Friday, January 13, 2017 11:34:01 AM
> *To:* David Sica
> *Cc:* njarc at mailman.qth.net
> *Subject:* Re: [NJARC] Cleaning metal fragments out of a radio tuner
>
> Just remember
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> Reply All = Everyone
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> --
> Al Klase – N3FRQ
> Jersey City, NJhttp://www.skywaves.ar88.net/
>
>
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