Thanks for the info, Stereo. The funny thing is I'm awaiting delivery of Audio Mirror's SET 45 amps which are supposed to arrive tomorrow. I couldn't replace the Tact with another preamp, as I'm using the Tact for digital room correction and crossovers. All I can do is add an analog preamp like the T-61 after Tact and before the amps like this: CD Transport -> Tact -> Outboard DAC -> Active Preamp -> Amps.
I'm also looking more closely at the possibility of upgrading my outboard DAC for a higher voltage level which would eliminate the need for an active preamp. I've been noticing that there are several high end DAC manufactures that think the Burr Brown 1704 (which I have in my DAC) was the most musical DAC made (it first came out in 1998) and are still using it in their products. I do really like the sound of my DAC, but it does not currently provide enough output voltage, which was the original reason for this thread.
I'm also looking more closely at the possibility of upgrading my outboard DAC for a higher voltage level which would eliminate the need for an active preamp. I've been noticing that there are several high end DAC manufactures that think the Burr Brown 1704 (which I have in my DAC) was the most musical DAC made (it first came out in 1998) and are still using it in their products. I do really like the sound of my DAC, but it does not currently provide enough output voltage, which was the original reason for this thread.