Philips AC Konstanter 7776?

hello friends,

I got today a ultra heavy AC konstanter made by Philips,

Type = 7776. Google don`t find anything about it.

I am searching for informations, application.

Technical Data:

Input = 187-244V 2,4kW
Output= 220V +/- 0,1% 10A

tubes: AZ41, GZ34, 56001, EF80, EL34
weight: a problem for 2 persons :-)

thank you for any informations,
greetings from germany

Martin

following pictures.

[image]

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AC konstanter that is an equipment that will stabilise the net supply.

mostly used in laboratory environment.
Input can vary widely from 187 till 244V and the output will constant be 220V within 0,1%
- That is very accurate!!

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Hello Martin,

Maybe there is some additional information to give some more clues on the two model plates, one of those does look rather extensive. If there's a letter in front of the serial number, this will in most cases indicate the place of manufacture.

I'm guessing this is an electronically controlled saturated core transformer.

The year of manufacture can probably be determined from the printings on the various transformers, as can the origin (at least of the transformers).

In later years, stabilisers like this were made in the factory in Wavre, Belgium. I'm not sure whether there were comparable models.

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Hello Martin,

As Maarten already suggested, this stabilizer is based on a saturated core transformer. Long time ago (late seventies) I got a similar device from surplus stock of Eindhoven University. The transformer has a large coil with many windings of very thin wire. Therefor it is possible to use a relatively small current (notice the EL34 that drives this coil) to control the 10A output current.

As the equipment was already outdated by then, I guess it originated somewhere from the late fifties. In my case the driving coil was intermittent so I had no other option than to discard the device. I hope yours is still ok; it would be nice to get it working again.

Wish you succes,
Ad

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hello Maarten,

the Type Plate.

Philips

Type 7776/06 Nr. WB 801 (ist this Wavre, Belgium? you seems to be right )

Transformer stamps, all beginning with "S84..."

Saturation Transformer, the very large one: S841262
The other big transformer: S845758 1
another: S842027 2

I will remove first the controller chassis, there is only 6 wires,
to clean that all. A very lot of work this morning :-)

I have to search for a 56001 tube to have a replace one, this may be rare.

greetings
Martin

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Hello Martin,

WB is Wavre Belgium allright. The numbers on the transformers are part numbers, there don't happen to be date codes (one or two letters, 3 numbers) on them as well? Otherwise my best guess is 1950's. Maybe schematic diagrams for later versions (GM... model numbers instead of 4 digits only) will be of use, if you can find them.

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2 C is changed to new.

[image]

it wakes up ;-)

the voltmeter is not working.
The regulation is near to perfect, I have tested with an electric heater, there is no swimming in the voltage.
Now I will look if it will be possible to repair the voltmeter.
The very light is from the regulator diode tube 56001. I think it use the own filament for regulating the system.

greetings
Martin

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Nice to have it (almost) working again!

Based on the presence of mustard-colour polyester caps, my guess is now late 1950's to early 1960's. I'm not sure why the model number is of the "4 digits only" variation, which in my mind would have put the date a bit earlier. There must be some kind of reasonable explanation for that. Maybe the older numbering scheme was used a bit longer for some types of equipment.

Before, I stated that model numbers of similair equipment would start with GM, but that's for measuring equipment. Power supplies may start their model numbers with PE.

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hello Maarten,

now I am rewinding the coil from the Voltmeter.
There are 12000 turns 0,06 (a lot of time...)

About the numbering.
May be this is not a serious model. The old man who give me this was in a leading position of the Valvo Philips Herborn, Germany (the capacitors manufacturing).
He have ordered it intern in the company. The nice milli ohm meter was also comming there.

greetings
Martin

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Hello Martin,

I've found a similar (but less powerful and slightly more modern looking) stabiliser at http://www.home.zonnet.nl/barend_servet/html_meetapparatuur/pe1000.htm Maybe the owner (Matthias, who is also a regular here), is able to supply some additional information.

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