hello friends,
this old Philips is a Stabilizer for the AC Line, still glowing.
A ultra heavy equipment, 2 persons have a problem to handle it
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/xsmiley.gif.pagespeed.ic.R8GFI-pF6f.png)
Philips 7776/06 made in Belgium, in the late 50`s.
Technical datas.
Input Voltage: any from 187 to 242V ~
maximum load: continuous 10A, 30min. 15A
Output Voltage: 220V +/- 0,1% (adjustable).
How it works.
There is a very special diode tube inside what control it`s resistance by the own heating filament. This is connected to a Transformer what is parallel to the output. The resistance of this tube will drive another Tube what control a big and heavy saturation transformer. In front of this is a large Transformer, its secondary winding of 60v is in series with the AC Line, going to the saturation transformer.
So the voltage there will be (input voltage +60v) bevor it`s going to regulation. So the apparat can work with input voltage much lower then the output voltage. The other tubes inside are periphery, 2 rectifiers and a driver for the EL34. All in all there are 5 tubes glowing.
See a lot of pictures from the restoration on my website, at
http://www.wellenkino.de/forum/thema.php?board=2&thema=30greetings
Martin