Tube pre amp with 2 outputs for Biamping

Anthem Pre 2L is reasonable. Can usually find one for 550-650 on Audiogon. Also some Rotel units have two sets of outputs. You might want to be careful. Some of the manufacturers that use two sets of pre outs just "y" off the main pre out of their unit to get the second one. So although you won't be using a "y", the manufacturer did. (Sometimes)

My Airtight ATC1 has two sets of outputs. If you can find one used they're usually under $2k and they sound great.

What's the difference whether the Y connector is on the inside or the outside of the preamp?

CJ PV10A

Rwwear--The difference "on the inside" would be --it would have the same wire--inside-- as the rest of the wireing--With an outside Y ;we are talking one brand of cable;another brand of Y .Seldom a great thing(understated)