16-11-2023, 12:25 AM
(This post was last modified: 16-11-2023, 12:25 AM by LENINGRAD T2.)
Between 1946 and 1949, RCA developed several models of projection televisions for home use. They had the same Schmidt projection modules marked PTU-1.
The optical part was made of a large cylinder with a spherical mirror at the end. A high-voltage 5TP4 CRT with a diameter of 125 mm was used.
http://www.myvintagetv.com/rca_ptu1.htm
It is worth mentioning that the well-known Mullard, Norelco (Protelgram) and Russian systems from 1957 had a more compact design and used smaller MW6-2, 3NP4, 6LK1 tubes, respectively. The most famous models of RCA receivers are the 8PCS41 from 1948 and the 9PC41, which appeared a year later. The younger version had a remote control to adjust the brightness. In total, several thousand of these TVs were produced. The advent of larger diameter cathode ray tubes killed projection television for several decades. In addition to home versions, RCA designed and implemented giant cinema projectors, in operation from around 1940 until the 1960s. Interestingly, when projection television was becoming a thing of the past in the US, in Europe Philips still distributed its versions of receivers, among others. in England.
A few days ago, my friend, who has been renovating old furniture for several dozen years, informed me that he is definitely retiring. He is 80 years old. He also added that he might still repair a few TV cabinets. I looked for some of the worst ones that no one would want to have in their workshop. One of them is the mentioned RCA 9PC41. This TV sat hidden in storage for several years. Everything about it is in poor condition. Rust is ubiquitous. I now had to remove all the electrical parts before sending the case in for refurbishment - 3 hours. Out of curiosity, I checked the 5TP4 CRT. I was very surprised when I saw good emissions on the meter. Maybe this junkyard can be brought back to life
Adam
The optical part was made of a large cylinder with a spherical mirror at the end. A high-voltage 5TP4 CRT with a diameter of 125 mm was used.
http://www.myvintagetv.com/rca_ptu1.htm
It is worth mentioning that the well-known Mullard, Norelco (Protelgram) and Russian systems from 1957 had a more compact design and used smaller MW6-2, 3NP4, 6LK1 tubes, respectively. The most famous models of RCA receivers are the 8PCS41 from 1948 and the 9PC41, which appeared a year later. The younger version had a remote control to adjust the brightness. In total, several thousand of these TVs were produced. The advent of larger diameter cathode ray tubes killed projection television for several decades. In addition to home versions, RCA designed and implemented giant cinema projectors, in operation from around 1940 until the 1960s. Interestingly, when projection television was becoming a thing of the past in the US, in Europe Philips still distributed its versions of receivers, among others. in England.
A few days ago, my friend, who has been renovating old furniture for several dozen years, informed me that he is definitely retiring. He is 80 years old. He also added that he might still repair a few TV cabinets. I looked for some of the worst ones that no one would want to have in their workshop. One of them is the mentioned RCA 9PC41. This TV sat hidden in storage for several years. Everything about it is in poor condition. Rust is ubiquitous. I now had to remove all the electrical parts before sending the case in for refurbishment - 3 hours. Out of curiosity, I checked the 5TP4 CRT. I was very surprised when I saw good emissions on the meter. Maybe this junkyard can be brought back to life
Adam
