Dirty switchers ...

Can you put up some pictures somewhere? You should be able to dope out the switch as a fet or IGBT with an ohm meter.

tm

just

that

has

side,

resistors

side

up

failed bleed resistor ?

CFL circuit similar ?

any opto-isolators with hold-off/control function?

That's pretty high tech for a product from the 1970s to use a switching power supply.

My first color TV -- purchased in 1974 -- was a Sony KV-1920. It had a switching supply.

I don't know which company was the first to make consumer products with switching supplies -- but I wouldn't be surprised if it were Sony.

that is pretty advanced.

It could be.

the oldest thing in the junk pile with a switcher I have is an apple ][ computer.

Of course they forgot to add a cooling fan or ventilation slots which Franklin Computer got right in their Ace series of clones.

I want to know more about this 1970s disco lighting system.

They weren't all that unknown in the '70s. Almost all of the large supplies we used were either switching or phase controlled (the really large ones). I only remember one linear supply above 1kW, and that was a 4V 1000A HP that was used in a piece of test equipment. Big as a refrigerator, it was.

ha. that thing must have been about 12% efficient.

I saw some open frame "international" style linear power supply at a surplus dealer marked Intel with the Intel logo that was rated tens of amps at something like 1.8 or 2.2 volts.

It was one of those preposterious things with extruded heatsinks and the bent aluminum chassis around all the TO-3 cans.

I've noticed "interntional" linear power supplies these days are complete crap compared to the ones from yesteryear. Condor was still making somewhat decent ones about 5 years ago complete with silkscreened copyrights of 1990 on the PCB and case.

They'd been doing it since before then -- I have the schematics in my RC-26 Receiving Tube Manual which depict a color set with half wave (yuck!) offline rectification. Goes right to the flyback, whence all the other voltages are generated. No heavy transformer (and, probably, a few months lifetime for the poor sweep tube!).

Tim

This one seemed to go over everyone's heads.

the joke (and sad truth) is disco never died in europe. All horrible things last forever there.

the germans have some of the creapiest musicans that are still alive and popular, like Fancy.

It is safe to say good music comes out of the UK on a regular basis.

Bagpipes?

years

disco

and

uk,

divide

musicians

Sure, if you mean a decade or two every century or two.

?;-)

I've never heard of a British Bluegrass band.

So I guess you are an eclectic sort of person that likes both types of music. Country *and* Western? :)

(to quote the blues brothers)

I have zero interest in disco -- but I've always wondered why people dislike it so much. It's supposed to be danced to, not listened to. Why would anyone want to sit and listen to such fundamentally uninteresting music?

That isn't Bluegrass. I like traditional country music, and 'Southern Gospel' music as well. I've owned & used waltz records, and classical music but Bluegrass is my favorite.

What most people call 'music' these days, gives me migraines.

The "Blues Brothers" were a couple burnt out druggies.

They dislike it because it is loud, repetitious noise, and listening was often unavoidable just like 'Rap'.

I used to sell at a flea market on the weekends, and some ass would set ut a boom box with a worn out tape of Cajun music and turn it up so loud you couldn't talk to customers. Then he would scream, "Doncha al' just love this s*it?" Some people wouldn't listen to certain types of 'music' if it was their choice, and being forced to put up with it by morons turns it into hatred.

Because it goes with leisure suits?