I'm looking for a realistic POD for the transistor to not exist in a TL I'm working on. So far I've got the two entries you can read below. Would you say these are plausible enough? Seeing that the main POD of my TL is in 1941, I would ideally only need POD's for the transistor after 1941.
SEPTEMBER 4TH 1943
American physicist and electrical engineer John Bardeen dies in a car crash accident.
MARCH 19TH 1947
A large fire destroys an entire research wing at the Bell Telephone Laboratories on Murray Hill, New Jersey. All work related to an invention called a “transistor” is lost in the incident. William Bradford Shockley, the research group manager does not manage to secure any continued funding from the board of directors, since the group was at a standstill lasting eight months already, after experiments failed every time in all sorts of configurations. Physicists on the project are diverted to work on improving existing vacuum tube technology, making them smaller and more durable. Economically, no alternatives to vacuum tube technology appear to be viable, either impossible to manufacture, too expensive or too fragile for practical use.