The Hegedüs Archives in Budapest contain recordings of various dialectal speech samples (spontaneous speech, storytelling, rune saying, etc) from the 1940s.
Video Recordings
Some short videp clips on reolucas of von Kempelene's speaking machine:
Helmont, F. M. 1667. Alphabeti vere Naturalis Hebraici Brevissima Delineatio: Quae simul Methodum suppeditat, iuxta quam qui surdi nati sunt sic informari possunt, ut non alios saltem loquentes intelligant, sed & ipsi ad sermonis usum perveniant. Sulzbach: Lichtenthaler. PDF of the original book
Kratzenstein, Chr. G. 1781. Tentamen resolvendi problema ab academia scientiarum imperiali petropolitana an annum 1780 publice propositum.PDF of the original book