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From: N_Cook on 4 Nov 2009 05:24
Ron <ron(a)lunevalleyaudio.com> wrote in message
news:ApudnWunndozpG3XnZ2dnUVZ7oKdnZ2d(a)bt.com...
> Arfa Daily wrote:
> > "N_Cook" <diverse(a)tcp.co.uk> wrote in message
> > news:hcp07p$hks$1(a)news.eternal-september.org...
> >> If anyone should have any info on the triac ? mains power protection,
or
> >> maybe similar Carlsbro amp , th/sw on heatsink plus other stuff
monitored
> >> presumably. Its in an awkward area to get to, a lot crammed in a small
> >> box.
> >> Anyone happen to no basic data on Carlsro badged TO3 audio o/p devices
> >> ERD1159
> >> ?
> >> (if on the off-chance of any schema, please confirm here , severe
filters
> >> on
> >> all my www divulged em accounts)
> >>
> >>
> >> --
> >> Diverse Devices, Southampton, England
> >> electronic hints and repair briefs , schematics/manuals list on
> >> http://home.graffiti.net/diverse:graffiti.net/
> >>
> >>
> >
> > I was going to suggest contacting Carlsbro direct, as I had in the past
> > found them helpful. However, lokking at their website, sadly it would
appear
> > that they are in administration, as of earlier this year ... :-(
> >
> > Another long-standing British company bites the dust.
> >
> > Arfa
> >
> >
>
> Oh they seem to come and go regularly. Some of the stuff they make isn't
> at all bad, the rest is rebadged Chinese junk.
>
> btw, If I recall correctly, and it`s the amp I thnk it is, it`s worth
> checking the screws holding the output transistors to the sinks. Some of
> the production run had anodised screws which made poor contact. I think
> they were black and needed to be replaced with unplated ones.
>
> Ron
>


All h/s screws needed tightening but all unplated. Distinctive feature all
sockets on the back XLR ,4 i/p and 4 speaker o/p one set of 4 female and
other male. I cannot, cold, see how this setup works
I'll have to desolder one each of the pairs of the th/sw (4 in total) , one
pair for each ch , seems one parallel pair for normal fan use (in series to
mains fan) and one higher temp parallel pair for overall cutout via mains
triac. As all seem to be s/c cold, perhaps one of an o/c-cold pair is
shorted. Then there is a triac crowbar on each output that presumably
activates the mains triac, 3 triacs in all, to confuse matters

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



From: N_Cook on 4 Nov 2009 07:53
Not a sw problem , a 47nF ,400V 1960s type yelowish cement cased poly cap
over a th/sw contacts was s/c. Had me bamboozled for a time.
So 2 n/o 58C th/sw in parallel for fan operation and 2 100C n/c th/sw in
series for cut out. Can power up now having sorted that conundrum out.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/


From: N_Cook on 5 Nov 2009 03:25
Power side works including the over temp th/sw system, now to somehow
reconnect the signal lines. Unfortunately another problem became apparent.
To avoid a 1 turn secondary on the torroid they passed the coach bolt
through a second anchoring plate with some insulation. Looks like 2 cut down
black plastic 1/4 inch socket outer rings. One either side of the hole in
the plate, but of course not high temp plastic and have softened enough to
deform , not actually making metal/metal contact but obviously not safe.


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



From: Bob Larter on 5 Nov 2009 21:55
David Nebenzahl wrote:
> On 11/3/2009 9:29 PM Bob Larter spake thus:
>
>> David Nebenzahl wrote:
> >
>>> On 11/3/2009 5:05 AM Arfa Daily spake thus:
>>>
>>>> I was going to suggest contacting Carlsbro direct, as I had in the
>>>> past found them helpful. However, lokking at their website, sadly it
>>>> would appear that they are in administration, as of earlier this
>>>> year ... :-(
>>>
>>> Is "in administration" Brit-speak for what we call in bankruptcy?
>>
>> Yes.
>
> Well, not quite, if you read Arfa's reply.

It's still pretty close. Think of the difference between Chapter 11 &
Chapter 14, for example.

--
W
. | ,. w , "Some people are alive only because
\|/ \|/ it is illegal to kill them." Perna condita delenda est
---^----^---------------------------------------------------------------
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