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Knobel "modular" RS ballast

Knobel "modular" RS ballast

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I've spotted this interesting swiss made ballast combination in a lift in a shopping center.
It's composed from a normal ballast(bottom one): a simple inductor, although splitted 1/2 on the neutral and 1/2 on the phase (I've never know what's the advantage to split the inductor in this way). The second part (the top one) is a transformer with two 6.5V secondaries used to heat the electrodes.

On the transformer it's written: For fluorescent lamps with high-ohm electrodes. What they mean? There are fluorescent lamps with different electrodes resistance? Or maybe it's a strange way to tell that the kripton T8 lamps (18,36W,...) are not supported?

By the way the lamps (osram T8 30W with a color like grolux) where heavily blacked.

KnobelRS.jpg PrfektStart2000.jpg Knobel.jpg

Light Information

Light Information

Manufacturer:Knobel
Model Reference:30.2001 and 42-6051
Lamp
Lamp Type:T8
Electrical
Wattage:30W
Current:0.36A
Physical/Production
Factory Location:Switzerland

File information

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Filename:KnobelRS.jpg
Album name:Kappa7 / Gear
Keywords:Gear
File Size:294 KB
Date added:May 17, 2014
Dimensions:2050 x 1672 pixels
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monkeyface
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May 17, 2014 at 02:15 PM Author: monkeyface
That's quite a rare find! I came only once by such a setup using separate filament heating transformer.

It is interesting to see that the choke is already the newer design while heating transformer is made of the previous design.
Kappa7
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May 17, 2014 at 02:26 PM Author: Kappa7
Actually it must be rare, it's the first time that I saw this setup.
Yes It's interesting, I think that they are from the eighties because they are still 220V rated.
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