Headphone hook up

Hi everyone, I have a Hafler DH100 preamp. I does not have a 1/4 inch headphone jack. I have a pair of AKG Q701 head phones that I would like to use with it. Is this possible and if so, how would I do this. On the back of the DH100 on one side there are 3 sets of RCA jacks, Phono, Tuner & Aux. On the other side there is the Line output along with Tape & Record. Could I use a Y adapter in any of these RCA's?
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