Christmas ghost/mystery story - not OT

N

N_Cook

Guest
Kustom KPS PM300 mixer amp , 2005, owner lent to a church for some do and
came back intermittant failure on both channels , now dead. There is some
distinctive greyish chopped strand fibre laying about inside, not heaps of
it but noticeable on otherwise new looking amp. Too coarse for asbestos and
too fine for glass fibre and putting a clump lazily between DVM probes
easily gives 10 to 30 ohms. Does carbon fibre look greyish rather than black
?

Only initial tryout and internal visual checks so far but ps , prea seem to
be ok , but no o/p L or R. As no relay click over , I suspect uPC1237 SIL
protector IC at the moment rather than failed 2x 150W Sanyo STK412-170
Hybrid module as both ch down, no burning etc. Not powered up exposed yet,
tomorrow job.
I'm a bit surprised no fan in this amp. I have relevant pinouts and PS DC on
overlay,
but any ideas on what the conductive stuff is / source?
Don't spooksville use something like that to get taken into ventillation
systems to knock out electronics?


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
 
In article <hggbvv$blk$1@news.eternal-september.org>, "N_Cook" <diverse@tcp.co.uk> wrote:
Kustom KPS PM300 mixer amp , 2005, owner lent to a church for some do and
came back intermittant failure on both channels , now dead. There is some
distinctive greyish chopped strand fibre laying about inside, not heaps of
it but noticeable on otherwise new looking amp. Too coarse for asbestos and
too fine for glass fibre and putting a clump lazily between DVM probes
easily gives 10 to 30 ohms. Does carbon fibre look greyish rather than black
?

Only initial tryout and internal visual checks so far but ps , prea seem to
be ok , but no o/p L or R. As no relay click over , I suspect uPC1237 SIL
protector IC at the moment rather than failed 2x 150W Sanyo STK412-170
Hybrid module as both ch down, no burning etc. Not powered up exposed yet,
tomorrow job.
I'm a bit surprised no fan in this amp. I have relevant pinouts and PS DC on
overlay,
but any ideas on what the conductive stuff is / source?
Don't spooksville use something like that to get taken into ventillation
systems to knock out electronics?
Click to expand...

Zinc whiskers?
 
On Fri, 18 Dec 2009 16:52:55 -0000, "N_Cook" <diverse@tcp.co.uk>wrote:

Kustom KPS PM300 mixer amp , 2005, owner lent to a church for some do and
came back intermittant failure on both channels , now dead. There is some
distinctive greyish chopped strand fibre laying about inside, not heaps of
it but noticeable on otherwise new looking amp. Too coarse for asbestos and
too fine for glass fibre and putting a clump lazily between DVM probes
easily gives 10 to 30 ohms. Does carbon fibre look greyish rather than black
?

Only initial tryout and internal visual checks so far but ps , prea seem to
be ok , but no o/p L or R. As no relay click over , I suspect uPC1237 SIL
protector IC at the moment rather than failed 2x 150W Sanyo STK412-170
Hybrid module as both ch down, no burning etc. Not powered up exposed yet,
tomorrow job.
I'm a bit surprised no fan in this amp. I have relevant pinouts and PS DC on
overlay,
but any ideas on what the conductive stuff is / source?
Don't spooksville use something like that to get taken into ventillation
systems to knock out electronics?
Click to expand...
Get out your EMF Ghost meter and check for ectoplasm.
 
N_Cook <diverse@tcp.co.uk> wrote:

Kustom KPS PM300 mixer amp , 2005, owner lent to a church for some do and
came back intermittant failure on both channels , now dead. There is some
distinctive greyish chopped strand fibre laying about inside, not heaps of
it but noticeable on otherwise new looking amp. Too coarse for asbestos and
too fine for glass fibre and putting a clump lazily between DVM probes
easily gives 10 to 30 ohms....
Click to expand...
The guts of a blown-up electrolytic capacitor?


--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk
 
Adrian Tuddenham <adrian@poppyrecords.invalid.invalid> wrote in message
news:1jaxodp.16by5brf71dq8N%adrian@poppyrecords.invalid.invalid...
N_Cook <diverse@tcp.co.uk> wrote:

Kustom KPS PM300 mixer amp , 2005, owner lent to a church for some do
and
came back intermittant failure on both channels , now dead. There is
some
distinctive greyish chopped strand fibre laying about inside, not heaps
of
it but noticeable on otherwise new looking amp. Too coarse for asbestos
and
too fine for glass fibre and putting a clump lazily between DVM probes
easily gives 10 to 30 ohms....

The guts of a blown-up electrolytic capacitor?


--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk
Click to expand...

Your thinking is conductive fluid now coating ordinary household type fibres
of clothing etc?
I'll try wiping some paper over a surface and removing the fibres


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
 
N_Cook <diverse@tcp.co.uk> wrote:

Adrian Tuddenham <adrian@poppyrecords.invalid.invalid> wrote in message
news:1jaxodp.16by5brf71dq8N%adrian@poppyrecords.invalid.invalid...
N_Cook <diverse@tcp.co.uk> wrote:

Kustom KPS PM300 mixer amp , 2005, owner lent to a church for some do
and
came back intermittant failure on both channels , now dead. There is
some
distinctive greyish chopped strand fibre laying about inside, not heaps
of
it but noticeable on otherwise new looking amp. Too coarse for asbestos
and
too fine for glass fibre and putting a clump lazily between DVM probes
easily gives 10 to 30 ohms....

The guts of a blown-up electrolytic capacitor?


--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk


Your thinking is conductive fluid now coating ordinary household type fibres
of clothing etc?
Click to expand...
Some wet electrolytics had an absorbent paper layer to hold the
electrolyte in contact with the foils. When they blew up (usually
because, when we were kids, we chucked them into a bonfire) the paper
layer expanded into something like the coating of fibres you have
described.

Look around the board and see if there is an aluminium corpse to explain
your ghost. (If the bang was a good one, the canister could be
elsewhere and you will only find bits of electrode left soldered to the
board.)


--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk
 
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