Very little information is available on the D-Lux Blue brand of tubes shown above. Serlin & Company, 129 and 1419 Michigan Ave., Detroit, Michigan sold these UV-201-A tubes for just 2 months in 1925 in the Detroit Free Press newspaper. They resemble the Brightson True Blue brand very closely in diameter of glass bulb, blue color, and the red bakelite base, however, the red base is mottled with a slightly different color on the Brightson’s. The display/shipping box is also quite similiar to the True Blue’s. It seems to be a coincidence that Brightson Laboratories Inc. had offices in New York City, Philadelphia, Jersey City, Milwaukee, Boston, and Detroit. There could also be a connection to Mastertone who made a similar blue 201 A tube. Without more information, what is in this article will have to do. Very little information is available on the D-Lux Blue brand of tubes shown above. Serlin & Company, 129 and 1419 Michigan Ave., Detroit, Michigan sold these UV-201-A tubes for just 2 months in 1925 in the Detroit Free Press newspaper. They resemble the Brightson True Blue brand very closely in diameter of glass bulb, blue color, and the red bakelite base, however, the red base is mottled with a slightly different color on the Brightson’s. The display/shipping box is also quite similiar to the True Blue’s. It seems to be a coincidence that Brightson Laboratories Inc. had offices in New York City, Philadelphia, Jersey City, Milwaukee, Boston, and Detroit. There could also be a connection to Mastertone who made a similar blue 201 A tube. Without more information, what is in this article will have to do.

The cropped Serlin & Co. ad for the D-Lux Blue Tubes on the left above is from the October 21st, 1925 Detroit Free Press and claims they are the new wonder tubes taking the country by storm with a small price. The whole ad was large, taking up 1/3 of a full page and stated they were the only cut rate radio store on Michigan Ave. in Detroit, and the prices proof it.

The middle ad is for Mastertone brand tubes. I have seen blue colored tubes from this maker so it may be possible that Mastertone made the D-Lux brand as well just without the plush lined carton.

Both the D-Lux and Mastertone resemble the True Blue brand, shown in the ad at the right, with the plush lined carton, in color and size. As blue tubes go they are quite beautiful but I think True Blue were in business in making that color for a bit longer than certainly D-Lux and possibily Mastertone as well.