27-08-2023, 12:43 AM
In the border areas of Belgium, the Netherlands and France, it was possible to receive a signal from the national transmitter operating in one system and from the neighbor's transmitter operating in a different standard. This undoubtedly enriched the program offer. Many Philips receivers from the 1950s were equipped with the 625/819 switch. It was probably heavily exploited. The development of a TV set with automatic standard switching was supposed to improve the "ergonomy" of viewing. Unfortunately, the Prisma company, we are talking about was a small concern. Only rudimentary documentation about it and its products has survived. It is known that it was located in Antwerp. It operated in the 50s. It produced only a few TV models. Prisma 91 was available in tabletop and console versions. The receiver has a transparent plexiglass cover on the front. The case was covered with veneer or leather. I have attached a photo with the type and layout of the valves. Unfortunately, I did not get to the wiring diagram of the receiver. I even made contact with Belgian lovers of old electronics. They also do not have such documentation. The internet also has its limitations.
I was supposed to put the Prisma 91 TV on the shelf. However, I think that without a schematic, you can also try to run it. But he has to wait in line. In the electrical system, the presence of the 85A2 voltage regulator draws attention. This is a rarely used solution in television receivers.
I wonder what happened to the millions of 405 line receivers in the UK when the 625 standard became widespread. Has a national recycling program for old receivers been established?
I think a little Peto scott would look good in my collection
.
I was supposed to put the Prisma 91 TV on the shelf. However, I think that without a schematic, you can also try to run it. But he has to wait in line. In the electrical system, the presence of the 85A2 voltage regulator draws attention. This is a rarely used solution in television receivers.
I wonder what happened to the millions of 405 line receivers in the UK when the 625 standard became widespread. Has a national recycling program for old receivers been established?
I think a little Peto scott would look good in my collection
.
