How do I hook uo headphones to my system?


I have a Pass Int-150, which has neither a tape loop nor a headphone jack, so I can't (easily or conveniently) used an outboard headphone amp or plugs the headphone directly into my amp. Yes, I know I could use an outboard amp and directly plug in whatever source I am using into the headphone amp, but I really don't want to go that route.

The other thing I thought of is slightly nuts- my CD player has a digital out; my tuner has balanced and unbalanced outs and my phono stage has balanced and unbalanced outs.

I could run my CD player into a dac and then run the DAC's output, the unused tuner output, and the unused phono output to an headphone amp which also has the capability to switch among input sources or to a preamp that has a decent headphone stage.

Way too confusing. Anyone have an easy solution?
128x128zavato
So this is what I did- it's inspired by Al.

My tuner and phono pre have rca and xlr outputs.
My CD player has an rca output and a SPDIF output.
I bought a Wyred 4 Sound DAC

I built my own rca switch box- most parts come from Parts Connexion

I built a Bottlehead Crack headphone amp

I bought Sennheiser HD600 cans.

Essentially I have a parallel headphone system.
The tuner rca our goes to my switch box
The xlr out from my phono pre is converted to unbalanced using a cable I made (klotz cable, neutrik female xlrs, vampire rca's. Hot, pin 2 goes to the rca center pin, 1 goes to shield and 3 remains unconnected). Phono then goes to the switch box. The CD rca puts also go to the switch box.

The switch box has 4 rca inputs but the switch is an Elma 04-1264 limited to 5 inputs. That way when I'm not listening to cans I can take the headphone system completely off grid.

The output of the switch box goes to the headphone amp.

The switch box uses the above noted Elma switch, 20 gauge Neotech OCC wire, Tiffany style rca's all in a Hammond box.

This little headphone system is so good, I find myself listening to cans even when I don't have to!

Now I'm waiting for a Cardas replacement can cable, and some NOS tubes for the Crack.
Thank You! This was a very enjoyable project- the headphone amp was kit built (and yes, I've already rolled tubes and made one mod and contemplating a 2nd as found on the very active Bottlehead forum) and the switch box was totally from scratch!

I'm itching to build another Bottlehead kit but I really don't have a use!