Audio samples are now available at Schweizer Fonogrammm:
https://www.schweizerfonogramm.com/cd/die-schweizer-opernsensation-samson-von-joachim-raff-1822-1882/
https://www.schweizerfonogramm.com/cd/die-schweizer-opernsensation-samson-von-joachim-raff-1822-1882/