Rafel,
Mouser has the 47mfd in stock in two versions, 647-UCY2C470MPD (12,000 hour 160V) and 647-UHE2A470MPD (7000 hour). Digikey has a 56mfd UHE UHE2A560MPD (7000 hour). The UHEs are 100V. I do not know if the capacitance value is critical not seeing the power supply schematic. Even though the original checks alright, being the age it is, replacing would be best. For filtering of the B+ supplies, a higher capacitance can be used. Going up in voltage can be done.
Mark
