preamp with processor loop...

processor loop = tape loop. Lots have them, some don/t. VAC does.

When you search forums as Riley suggested you will find that if you are wanting to integrate with a HT system you dont need to have Processor Loop or HT Bypass....the solution without this feature is described in length but it can open up lots of options and maybe save money.

My McIntosh C200 has both a "listen" processor loop and a "record" processor loop, as well as the traditional tape loop. All very useful.