Vignetting problems with Magnifax 4

Hello to everybody! I bought a Meopta magnifax 4 five years ago, brand new! I have also the complete set of condenser for the 24x36 and for the 6x9, and a very good set of lenses, 50 and 80 mm componon s. Some days ago, I was printing a "particular" negative 24x36, the subject was a sand dune even lighted large as the complete negative . The espected result was an even lighted sand dune print, on the contrary with disappointement I obtained a dune with the both side clearer! So i performed a test:I take out the negative and I printed a strip of paper long about 40 cm without any negative, only the enlarger light. A bad surprise! The strip is darker at one side and lighter at the other, the enlarger suffer of vignetting, I think about half stop or a little bit less. If you print a normal landscape with a lot of tone variation it is impossible to check. But if you have a long even lighted subject it is quite annoyng. I have performed other test: cleaning the condensers, changing lamp (150 W), using different lens aperture, cheking enlarger alignement, (it was ok). At the end only one explanation, probably an about 1/2 or 1/3 of stop vignetting from the center to the border is the limit of the equipment,sic! Many thank for every comment or suggestions.

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