suitable for Preamp Power Supply here>?

[petemoore]

I have a non center tapped transformer secondary feeding a 4 diode FWR, this provides 204 VDC at the first filter capacitor, a 32uf.
Further filtering including a string of B+'s is possible.
Can I use the _ [negative pole] from the diode bridge and "E" [from IEC connector] as the preamp ground ?