EEVblog 1577 - History of Cathode Ray Tubes with Kathy Joseph - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: November 05, 2023, 10:01:17 pm
content: Kathy Joseph from Kathy Loves Physics joins me on The Amp Hour to discuss the history and physics and we end up discussing the intricate history of the development of the Cathode Ray Tube.00:00 - Kathy Loves Physics02:45 - Philo Farnsworth, the farmboy who invented television10:00 - Professor Julius Plucker & Heinrich Ruhmkorff11:13 - Heinrich Geissler and Geissler tubes14:28 - Johann Wilhelm Hittorf16:15 - William Crookes and the Crookes Radiometer20:00 - Heinrich Hertz25:00 - Scintillating Scotoma27:00 - Philipp Lenard31:25 - Wilhelm Rontgen38:45 - Mihajlo Pupin44:00 - Francis Perrin49:10 - Henri Becquerel55:39 - Curie Piezoelectric Quartz Balance Electrometer1:07:46 - Philco & Bob Pease1:08:44 - Vladimir Zworykin1:15:12 - Free Energy & Debunkinghttps://tinyurl.com/TheLightningTamershttps://en.wikipedia.org/wiki/Philo_Farnsworthhttps://en.wikipedia.org/wiki/Julius_Pl%C3%BCckerhttps://en.wikipedia.org/wiki/Heinrich_Daniel_Ruhmkorffhttps://en.wikipedia.org/wiki/Heinrich_Gei%C3%9Flerhttps://en.wikipedia.org/wiki/Johann_Wilhelm_Hittorfhttps://en.wikipedia.org/wiki/William_Crookeshttps://en.wikipedia.org/wiki/Crookes_radiometerhttps://en.wikipedia.org/wiki/Heinrich_Hertzhttps://en.wikipedia.org/wiki/Philipp_Lenardhttps://en.wikipedia.org/wiki/Francis_Perrin_(physicist)https://en.wikipedia.org/wiki/Henri_Becquerelhttps://en.wikipedia.org/wiki/Vladimir_K._Zworykinhttps://en.wikipedia.org/wiki/Mihajlo_Pupinhttps://en.wikipedia.org/wiki/Wilhelm_R%C3%B6ntgenhttps://en.wikipedia.org/wiki/Philcohttps://medium.com/@johnwelford15/the-canals-of-mars-2a6fcce973c#:~:text=The%20%E2%80%9Coceans%E2%80%9D%20that%20Herschel%20spotted,is%20not%20one%20of%20them!http://waywiser.fas.harvard.edu/objects/15043/curie-piezoelectric-quartz-balance-or-electrometer;jsessionid=905D1CA90CE49F4637CBC07F90BC8BFE

author: N2IXK
author_rank: Frequent Contributor
timestamp: November 08, 2023, 01:42:58 pm
content: A really interesting history of early developments, and their impact on the science of physics, the discovery of the electron, etc. Good stuff!If anyone is interested in a REALLY deep dive into the history of the CRT, from the early history covered in this episode, through the final developments before flat panels took over the market, I can highly recommend Peter Keller's Book "The Cathode-Ray Tube: Technology, History and Applications".https://www.amazon.com/Cathode-Ray-Tube-Technology-History-Applications/dp/0963155903Keller was a CRT engineer with Tektronix, and the book has extensive coverage of CRT development for oscilloscopes, as well as television, radar, and all kinds of exotic specialty applications.BTW, Bob Pease worked for George A. PHILBRICK, not "Philco"....

author: EEVblog
author_rank: Unknown
timestamp: November 09, 2023, 01:24:26 am
content: Quote from: N2IXK on November 08, 2023, 01:42:58 pmYep, wonky memory.

author: floobydust
author_rank: Super Contributor
timestamp: November 09, 2023, 01:58:29 am
content: I recall they found in Nazi Germany square, perfectly flat screen CRTs. Apparently their glass manufacturing technology was decades ahead, the first to make them flat and square.It was also shocking they were very close to having TV as I recall the documentary.The impact of the CRT on humanity is absolutely huge, propaganda included.

author: N2IXK
author_rank: Frequent Contributor
timestamp: November 09, 2023, 02:14:09 am
content: Why a square CRT? Did Nazi-era German TV use a square image? The US standard was a rectangular image, with a 4:3 aspect ratio.Early CRTs were round, but rectangular ones came along once TV really started to take off in the 1950s. The deflection angles slowly got wider and wider, allowing increasingly shallow tubes.

author: floobydust
author_rank: Super Contributor
timestamp: November 09, 2023, 03:37:39 am
content: I think it waspre-war TVlikeTelefunken FE II 1933/34small CRT but flat and square. The CRT- glass technology played a major part. You can see many were round as well.VHF transmitters were also part of the tech, not sure what Germany had."At the end of 1946, only 44,000 {American} homes had a TV set; by the end of 1949, there were 4.2 million TV homes. By 1953, 50% of American homes had television."https://www.earlytelevision.org/postwar_american.html