Want to build the Line Drive I used to own

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Years ago I had a Mod Squad Line Drive passive preamp but sold it but wish I had not. (I've said that many times about many audio gizmos, guitars, so forth)

It was a very simple device so I'd like to build one for switching between two line level sources but don't know the resistance of the pot they used for volume control. Anyone have any suggestions for a good pot?

Not interested in transformer volume controls and such. Way too much $.

I'd also like it to have two sets of stereo outputs - one for an amp and the other for driving a headphone amp. The amp output would be volume controlled but not the headphone output. Can I just connect the headphone output directly to the input switch and get reasonable results?
 
It was a very simple device so I'd like to build one for switching between two line level sources but don't know the resistance of the pot they used for volume control. Anyone have any suggestions for a good pot?

Any good quality potentiometer will work in that situation. I'd suggest you keep it around 10k or 20k... higher invites hum, lower creates load on your sources.

The real problem is going to be the housing. If it is not to hum, it's going to have to be metal, grounded to the connectors and perhaps even groundable to your amplifier (like a turntable is).

I'd also like it to have two sets of stereo outputs - one for an amp and the other for driving a headphone amp. The amp output would be volume controlled but not the headphone output. Can I just connect the headphone output directly to the input switch and get reasonable results?

Yes.
 
I suppose an easy way around this is to buy a Schiit Sys and add an additional output that connects directly to the switch and bypasses the pot.

You can do this a lot more inexpensively on your own.

All you need is a good quality carbon potentiometer, a snall switch, a suitable metal casing, and a bunch of chassis mount RCA jacks. Total cost likely to be under $30.
 
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