Cracking open a Galaxy Audio PA amp

[polymod]

"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
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"polymod" <polymod@optonline.net> wrote in message
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"David Nebenzahl" <nobody@but.us.chickens> wrote in message
news:4c9427e7$0$2441$822641b3@news.adtechcomputers.com...
On 9/17/2010 6:42 PM Arfa Daily spake thus:

"David Nebenzahl" <nobody@but.us.chickens> wrote in message
news:4c92c1a9$0$2406$822641b3@news.adtechcomputers.com...

Ackshooly, I've been saying for years that there are two types of
Americans distinguishable by their taste for Brit humor. One one
side we have the PBS-type humor, exemplified by "Are You Being
Served?" (which I despise); on the other are those who like Benny
Hill. I'm in the latter camp myself. (Hey, what's better than total
slapstick? Worked for Chaplin
...)

You really shouldn't dis 'Are You Being Served ?' It was an absolute
classic up there with the likes of Fawlty Towers ... The double
entendre
with things like Mrs Slocombe's pussy, were really quite risque for
British
TV at the time. Although I used to really enjoy Benny Hill for its
pure
slapstick, the humour was much cruder than that of AYBS.

Well, not to belabor the point *too* much, but Fawlty Towers was
absolutely sublime compared to either one of those other two shows.

Do we have any "Vicar of Dibley" fans?
Still one of my favorite shows.

And I have to hand it to your Brits: there has never been *anything* on
television to equal "The Prisoner", and I doubt there will be in my
lifetime.

Agreed. as a matter of fact I liked the show so much I named my debut CD
after it

Cheers!

Poly



H.H. ??

Hehe...if you mean Herbie, no it's not that "Prisoner". I wish

Poly

 

[David Nebenzahl]

On 9/18/2010 6:03 PM Arfa Daily spake thus:

The Prisoner was another interesting one that I saw a documentary about.
McGoohan said that he originally conceived it as a sort of 'follow on' to
his character in the long running sixties series "Danger Man".

[snip]

.... which was called "Secret Agent Man" over here in the U.S. Good show,
very well conceived and put together, but of course lacking the
surrealism that made The Prisoner so great.


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)

 

[Arfa Daily]

"polymod" <polymod@optonline.net> wrote in message
news:4c9627a8$0$31278$607ed4bc@cv.net...

"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
news:9qdlo.121242$Hv6.31224@newsfe04.ams2...


"polymod" <polymod@optonline.net> wrote in message
news:4c94c9e3$0$9557$607ed4bc@cv.net...

"David Nebenzahl" <nobody@but.us.chickens> wrote in message
news:4c9427e7$0$2441$822641b3@news.adtechcomputers.com...
On 9/17/2010 6:42 PM Arfa Daily spake thus:

"David Nebenzahl" <nobody@but.us.chickens> wrote in message
news:4c92c1a9$0$2406$822641b3@news.adtechcomputers.com...

Ackshooly, I've been saying for years that there are two types of
Americans distinguishable by their taste for Brit humor. One one
side we have the PBS-type humor, exemplified by "Are You Being
Served?" (which I despise); on the other are those who like Benny
Hill. I'm in the latter camp myself. (Hey, what's better than total
slapstick? Worked for Chaplin
...)

You really shouldn't dis 'Are You Being Served ?' It was an
absolute
classic up there with the likes of Fawlty Towers ... The double
entendre
with things like Mrs Slocombe's pussy, were really quite risque for
British
TV at the time. Although I used to really enjoy Benny Hill for its
pure
slapstick, the humour was much cruder than that of AYBS.

Well, not to belabor the point *too* much, but Fawlty Towers was
absolutely sublime compared to either one of those other two shows.

Do we have any "Vicar of Dibley" fans?
Still one of my favorite shows.

And I have to hand it to your Brits: there has never been *anything*
on
television to equal "The Prisoner", and I doubt there will be in my
lifetime.

Agreed. as a matter of fact I liked the show so much I named my debut
CD
after it

Cheers!

Poly



H.H. ??

Hehe...if you mean Herbie, no it's not that "Prisoner". I wish

Poly

Thought that was too good to be true ...

Arfa

 

[Wild_Bill]

I'm dredging up this old subject from 2010 which isn't really worthy of
reading since it's mostly personal attack exchanges, but the point worth
mentioning* is:

Remove the 6 front panel screws AND 1 screw in the back *plus the nut on the
1/4" jack.

The reason I was looking for looking for info regarding this unit (already
had it opened) is because I bought one today for $10US.
I routinely open and inspect any used equipment before I apply power.. just
a habit, although I usually can't resist opening new equipment either, after
I've used it for a while.

A schematic is available at Galaxy Audio's site
http://galaxyaudio.com/schematics.php

The seller said this unit was for parts/repair, and that it had been working
fine for years, then suddenly didn't.

Inspection hasn't been very thorough yet, although I didn't notice any
fuses, but also didn't notice anything burnt.
I saw pics of a board which had a burnt circuit trace on the large board
near where the edge of the board makes an inside corner and is close to the
speaker magnet.

There are a couple of spots of heat-induced discoloration around the leads
of D21 & 22, but it's minor.
These diodes are tied to/across the plus and minus supplies from the PSU.

In addition to the 15V supplies, there are also +/- 23V and +/- 50V
supplies.

A description of the unit states it's a Class H amplifier with 4 output Qs..
2 for low voltage (always in use), and 2 for high voltage which kick in when
demand exceeds the capacity of the LV pair.

--
Cheers,
WB
..............


"David Nebenzahl" <nobody@but.us.chickens> wrote in message
news:4c8db73c$0$2395$822641b3@news.adtechcomputers.com...

I inherited a repair job that I can't get started because I can't get the
damn amp open.

It's a Galaxy Audio Core PA5X140 all-in-one PA. It's a tough little unit,
with a die-cast metal chassis set into a thick rugged plastic
(polypropylene?) case, that can sit on top of a mike stand. Similar to
this one: http://galaxyaudio.com/MSPA.jsp. The front of the chassis has 6
screws into the case, and there's one on the back I removed, but I still
can't get the chassis out of the case. I tried prying the case, thinking
there might be some cast-in lugs I could open, but no luck, and I didn't
want to risk chewing up the edge of the case.

Does anyone have any idea how to open up this unit?


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)

 

[Wild_Bill]

When powerd on, there was definitely no output, not even the slightest tick
noise.
With an external speaker connected, the output appears to be normal as far
as hum and crackle when the input signal line is touched.

It turns out that the 5" driver coil is open.. and examination of the face
of the cone revealed that someone had altered/tampered with it before. The
cone has some kinks in the pleated cone surround, and there is some
significant distortion/warpage of the cone itself (although there doesn't
appear to be any rubbing between the coil form and pole piece).
The dust cover shows 2 distinctly different applications of black goop, and
one compound appears to be RTV silicone.
From the back/frame side of the cone, it appeared as though one of the
eyelets was working it's way out thru the back of the cone.

I put some small dabs of paint stripper (methanol and methylene chloride)
around the eyelets where the tinsel wires are soldered to the voice coil
wires (beside the center dust cover).
After a while I started poking around/scraping at the black goop, expecting
it to have been softened by the stripper, but it was rubbery like RTV.

The dust cover appeared to have been previously replaced and seemed to be
sitting fairly high above the cone, so I cut the cover away to reveal more
of the area where the coil form meets the cone.
After pulling quite a bit of the goop off, I located the fine voice coil
wires cemented to the cone leading to the eyelets.. and found the break in
the fine wire.
Ohm meter check shows that the coil is likely still intact, so I may attempt
to solder a jumper across the break.. just for grins.
I think the eyelets in the cone need to be secured to the cone with
something solid (a glue that dries hard) to ensure that they can't move.

--
Cheers,
WB
..............


"Wild_Bill" <wb_wildbill@XSPAMyahoo.com> wrote in message
news:BbgTs.153767$Yp1.71792@en-nntp-13.dc1.easynews.com...

A schematic is available at Galaxy Audio's site
http://galaxyaudio.com/schematics.php

The seller said this unit was for parts/repair, and that it had been
working fine for years, then suddenly didn't.

Inspection hasn't been very thorough yet, although I didn't notice any
fuses, but also didn't notice anything burnt.

 

[Wild_Bill]

After soldering jumpers (wirewrap 30ga) across the voice coil wires adjacent
to the coil form, and extending to each eyelet (where the tinsel wire is
joined to the coli leads in production), the driver/speaker appears to
function normally.

Dabs of a hard-drying glue (Seal-All) were applied to the back side of the
cone around the eyelets to try to secure them to the cone, especially the
one that appeared to be pulling out the back side (which is also the same
coil lead that was broken).
I suspect that the loose eyelet was passing stress/movement to the very fine
coil wire, leading to the break.

The center dust cover was glued back in place (Seal-All) and allowed to dry
for 2 days on a mildly warm heater.
I expect this is the last attempted rescue for this speaker.

A new Galaxy Audio S5N-8 replacement is on its way.. I found a large audio
dealer in Kansas on eBag that accepted an offer of $49 delivery included.

--
Cheers,
WB
..............


"Wild_Bill" <wb_wildbill@XSPAMyahoo.com> wrote in message
news:ZTyTs.156190$Yp1.122945@en-nntp-13.dc1.easynews.com...

It turns out that the 5" driver coil is open.. and examination of the face
of the cone revealed that someone had altered/tampered with it before.

 

On Monday, September 13, 2010 at 12:32:15 AM UTC-5, David Nebenzahl wrote:

I inherited a repair job that I can't get started because I can't get
the damn amp open.

It's a Galaxy Audio Core PA5X140 all-in-one PA. It's a tough little
unit, with a die-cast metal chassis set into a thick rugged plastic
(polypropylene?) case, that can sit on top of a mike stand. Similar to
this one: http://galaxyaudio.com/MSPA.jsp. The front of the chassis has
6 screws into the case, and there's one on the back I removed, but I
still can't get the chassis out of the case. I tried prying the case,
thinking there might be some cast-in lugs I could open, but no luck, and
I didn't want to risk chewing up the edge of the case.

Does anyone have any idea how to open up this unit?


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)

Remove 6 screws from front, 1 screw and 1 nut for speaker jack on back. Get a couple of thin flat blade screwdriver to break the seal around the front metal cage to the plastic back cover. it should slide out easily.

 

On Wednesday, May 9, 2018 at 5:55:28 PM UTC-4, clifs...@gmail.com wrote:

On Monday, September 13, 2010 at 12:32:15 AM UTC-5, David Nebenzahl wrote:
I inherited a repair job that I can't get started because I can't get
the damn amp open.

It's a Galaxy Audio Core PA5X140 all-in-one PA. It's a tough little
unit, with a die-cast metal chassis set into a thick rugged plastic
(polypropylene?) case, that can sit on top of a mike stand. Similar to
this one: http://galaxyaudio.com/MSPA.jsp. The front of the chassis has
6 screws into the case, and there's one on the back I removed, but I
still can't get the chassis out of the case. I tried prying the case,
thinking there might be some cast-in lugs I could open, but no luck, and
I didn't want to risk chewing up the edge of the case.

Does anyone have any idea how to open up this unit?


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)

Remove 6 screws from front, 1 screw and 1 nut for speaker jack on back. Get a couple of thin flat blade screwdriver to break the seal around the front metal cage to the plastic back cover. it should slide out easily.

You realize that the posting is over 5 years old right!!

 

[John-Del]

On Wednesday, May 9, 2018 at 7:55:28 PM UTC-4, dansabr...@yahoo.com wrote:

On Wednesday, May 9, 2018 at 5:55:28 PM UTC-4, clifs...@gmail.com wrote:
On Monday, September 13, 2010 at 12:32:15 AM UTC-5, David Nebenzahl wrote:
I inherited a repair job that I can't get started because I can't get
the damn amp open.

It's a Galaxy Audio Core PA5X140 all-in-one PA. It's a tough little
unit, with a die-cast metal chassis set into a thick rugged plastic
(polypropylene?) case, that can sit on top of a mike stand. Similar to
this one: http://galaxyaudio.com/MSPA.jsp. The front of the chassis has
6 screws into the case, and there's one on the back I removed, but I
still can't get the chassis out of the case. I tried prying the case,
thinking there might be some cast-in lugs I could open, but no luck, and
I didn't want to risk chewing up the edge of the case.

Does anyone have any idea how to open up this unit?


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)

Remove 6 screws from front, 1 screw and 1 nut for speaker jack on back. Get a couple of thin flat blade screwdriver to break the seal around the front metal cage to the plastic back cover. it should slide out easily.

You realize that the posting is over 5 years old right!!

I called OP David Nebenzahl. For your information sir, he's been sitting by his computer staring at the screen for the last five years waiting for that very answer. While he's enormously grateful, he hasn't responded publicly with a thank you yet because he's not doing very well. It seems that in the last five years, he's ignored his health, is suffering from vitamin D deficiency, and put on a lot of weight. He also took up smoking. But with his amp now open, he'll be back in form in less than two years according to him...

 

[pfjw@aol.com]

That was just cruel!

Peter Wieck
Melrose Park, PA