Calling all PSE Studio HL-1 pre owners.

I just bought this preamp and can't find any owner manual or much info about it, would like to know what good tube to use ( the tube in this pre has been for 15 yrs )and it has 3 outputs 2x rca and 1 balance, can I use one balance for amp and one rca for sub at the same time or all 3 ? Any info and help would be greatly appreciated.