I highly recommend the Chase RLC-1 Remote Line Controller, there are several used or new ones listed now
https://www.hifishark.com/search?q=chase+rlc-1
You can use it a variety of ways, direct; via a tape loop; via a processor loop; just for your pream, or it has 4 selectable line in if you want to bypass your preamp for any line level source.
for remote power; remote volume, and wonderfully for remote balance, it has remote treble and bass which I never use, and, it includes automatic and progressive bass boost only for very low volume listening.
Over many years, in a variety of setups, neither I nor my friends can detect if it is in line or not, it silently does it’s job. 105 db s/n ratio.
I retain all the features of my Vintage McIntosh mx110z tube tuner/preamp in my main system, and get remote volume of a Vintage Receiver in my garage/shop system. in my office, I use it only for remote system power.
Note: it must have the remote control, there are no controls on the unit itself.