Stefpol, Romstan now Hertz and God knows under what name they still produce it. I'm afraid it's still duplicating the same dug construction. I would advise against, although I did not see Hertz from the inside, but I saw Stefan and Romstan and that's enough for me (to this day I don't sleep at night )
Everything is usually patted on one hoof - the difference is in the transformer itself and the way of controlling the power. Either there is a toroid controlled by a phase regulator, with a curiosity in the form of a compact coil of resistance wire for loading the transformer, or an EI transformer with taps. The rest in the same "technology".
Well, gentlemen, what do you recommend? I was browsing the Internet, shops and auctions but it seems to me that everything is one hoof. Maybe you have something better? Let's say I could spend PLN 400 on it
link Although there is no smooth regulation but maybe better made?
I am alone ZPB 12V / 15A interested, but no opinion about him ... I'm not an expert, but just like with traditional batteries, the weight of the device can be an indicator of quality ... regarding the mentioned mass, I found information about the weight of 4.5 kg, which in combination with a clearly plastic housing may suggest that copper was not saved ...
photo with official specification found on the web:
... as for the company itself, it can only be said that it did not appear yesterday and, among others rectifiers have been on offer for several years so having a choice of rectifiers with similar current parameters and a mass ranging from 1.7 (!!) to 2.6kg against 4.5kg of the above model, I am willing to buy it - unless I advise against it