Is Stirling's Dies the Fire the opening of the series where he imagines the return of feudalism with modern people? (Yes, a contradiction in terms but there seems to be something wrong with Stirling's brain [Draka series.]) Revolution may be taking off from that and focusing on the overthrow of democracy/capitalism/namby pamby couch potatoes.
Raymond F. Jones' The Year When Stardust Fell had a similar but more logical premise, in which dust from a comet tail caused all metal moving surfaces in contact to cold weld. Voila! Basically no modern machinery. And this was published in 1958 before solid state electronics really took off.