Converting Solid State to Tube Rectification on a Preamp

why would i change a solid state rect. to tube??? I am curious to see if a tube rect will outperform a solid states in my preamp.

Using four rectifier tubes like 6AX4 to create a full-wave bridge and a 6V 5A power supply for heaters should work, This is a schematic for your referance:

http://1.bp.blogspot.com/_ZXzBbxBRjUc/TVKRXcVOklI/AAAAAAAAAGc/i_zXDoVqTHw/s1600/6CB5A-PSU-Graetz-6AX...

maybe add some high DC voltage rating spdt relays control by a switch so you can select between tube or solid states rectifier.

Oops!
one more thing, as mentioned by salectric: the resulting B+ voltage will be lower than with a solid state rectifier, that may or may not be a problem.

Imfihifan... thanks for the awesome link. 

if i decided to do just a half wave rectifier using a single tube 6x5, is that possible?   Also, with the secondary measure at 350v, that is more than enough for a single 6x5 plate voltage? 

if i decided to do just a half wave rectifier using a single tube 6x5, is that possible?   Also, with the secondary measure at 350v, that is more than enough for a single 6x5 plate voltage?

Sorry I don't have an answer for your question, but if you really want to use a single 6X5 with the existing transformer, check out this link:
http://www.antiqueradios.com/forums/viewtopic.php?f=13&t=176225