Quote:
Originally Posted by tubesrule
Penthode,
I actually provided much of the info for that article  While the RMA didn't officially adopt the 441 standard until 1937, RCA was using it exclusively from mid 1936 on. |
Thanks for the information. I thought the date was September 1938 for adoption of the 441 line standard by the RMA and even then Philco broke ranks. The feeling was that 441 was going to become rapidly obsolete. This led to the final settlement on 525 in 1941.
It is amazing to consider the longevity of 525 considering the changes over the past 70 years. It certainly proved to be the correct choice as it is still strong. 625 I believe only began in Germany in 1952 and French 441 and 819 along with 405 gave way to 625 in the end.
The remarkable thing about 405 is that it emerged from EMI so early in May 1934, was the UK industry standard from February 1937 and remained so until the Pilkington Committee recommended the introduction of 625 lines for the second BBC channel in 1964. Nevertheless, 405 continued until January 3 1985.