Carlsbro S600M, 1981 600W slave amp

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

On 11/3/2009 5:05 AM Arfa Daily spake thus:

Is "in administration" Brit-speak for what we call in bankruptcy?

For all intents and purposes, yes, but AIUI theoretically sort of a stage before declaring your company truly bankrupt. If you are in serious hock to the bank for instance, and they are worried that they are not going to get paid because of poor trading performance, they may force you into administration, from which place, the administrators may ultimately declare you bankrupt, if they determine the company is beyond saving. See :-

Arfa

On 11/3/2009 6:13 PM Arfa Daily spake thus:

Ah, so. I think we call that being "in receivership" over on this side of the pond. (If I'm wrong I'm sure someone will correct me.)

Points to your term for being more direct. (Like the beauty of the term "lift" compared to our lugubrious "elevator".)

On 11/3/2009 9:29 PM Bob Larter spake thus:

Well, not quite, if you read Arfa's reply.

Yes.

monitored

filters

appear

Once the "administrators" (vultures) go in there is little chance of survival. With all the accrued debts and then the costs of the administrators on top. I was an unsecured creditor to the failure of one of the last UK component makers, Cambridge Capacitors, Romsey , Hants . As part of that process you get breakdowns of all costs. 600 GBP per hour for the head administrator and 400 GBP per hour for his assistant etc etc on top of all else.

If there is anything left to go to auction, I hope someone buys all the manuals. I managed to buy the accumulated manuals of a large Southampton electronic sales and repair business that was in Southampton from the 1950s to failure about 10 years ago.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

We also use the term "In receivership" over here. I think it has slightly more 'legal' connotations than "In administration" due to the fact that the 'receivers' or administrators are court-appointed as a result of some legal case that's been brought against a company for non-payment or failure to supply goods etc.

See

or

monitored

filters

appear

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

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

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

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