FORTE MODEL 44 Preamp - Manual and Upgrades

If anyone has a copy of a manual that you can send it be very helpful and appreciated. I really only have one concern and that is regarding the H1 and H2 inputs. Are these just standard line level inputs with the same circuitry and component parts as the CD input?
Any comments regarding easy upgrades? I can solder, but I'm no electrical engineer.
Go to: www dot vintage amp repair dot net, and email Jon Soderberg. He's the Threshold/Forte man
I have a Threshold T3i, which basically has the same six input selecter as the Model 44. The H1 and H2 inputs on the T3i are standard line level inputs... Your Forte is most likely the same