Luxman LV-117 volume potmeter

It’s almost impossible to find a 150KB stereo pot with center tap, if you omit the loudness control, the ALPS RK27 100KAx2 pot recommended by georgehifi should work. Or you can use a 23-position 2 deck switch with 22x6.8KΩ resistors in series on each channel to make it to a 150KΩ linear stereo stepped attenuator with center tap.

https://www.goldpt.com/V47_275.jpg

It's a stereo linear pot with center tap for "Loudness".

https://www.manualslib.com/manual/1015087/Luxman-Lv-117.html?page=19#manual