[Amps] DIODE / RECTIFIER BLOCKS: SILEC: SPECS ?

[W.F van Wyk]

Need help with Diode/Rectifier blocks made by SILEC.

There is two type of markings: SILEC F 80 H and in small letter 7509 also SILEC F80 H and in small letters 7511.

What will be the voltage and amperage rating on these. They come out of a marine amp that has four 4cx250 tubes and power transformer 3000 volts. 

Any help will be greatly appreciated.

73

Wynand
ZS6ARF