To answer Louis re; T8 taste problem...
It could be a problem with a couple of things. My first guess would be that the heating element may not be getting temperature of water hot enough. I've used T8 machines for the last 30 years, but have not experienced any taste problems. Some of these T8 have been used since the 1960s years--they last a very long time. I don't know if yours is old, maybe it is just not working and heating properly after a long time of service. If it's a "made in Germany" one, it could be quite old as I think Germany stopped making them in the 1980s years and let production happen in France and Portugal--This could be.
What also can affect taste is the following: Good pure or filtered water…and the grind/filling method. Ideally the beans should be ground a bit coarser than espresso grind. T8 should not brew with powdery or too fine of grind. Make sure you are filling the coffee filter basket almost full and then tamping or pressing all the ground beans nice and compact/tight (putting in a paper filter disk first). I can photograph my process in the morning and add pix for you if you like!
As my water measuring utensils are U.S., this is my recipe (32oz water--brews to midpoint of 10-11 cup mark on T8 carafe) and I use roughly 8 full tablespoons of beans (approximately 60gram). Your grinder machine shouldn't matter if it is blade or burr-mill type--I have used both and don't notice any difference in grind quality or taste, really.
This is how I use it. My results equal or better my Technivorm all the time! But I DO like that Technivorm are hand built in your country and use copper heating. They are very, very nice and quality machines. I just personally prefer T8 as it very closely approximates the results of the old vacuum brew machines.
Like you, I also keep the old Brauns around (just like your pictures show). Beautiful to look at, but I agree that they do not keep temperature too well (and I also notice they do not brew at consistent temperature throughout the process as Technivorm and T8 do).