The problem you are having is using the preamp section on an old receiver. If you had a good preamp you would not be losing resolution, detail, Yada Yada..
How much is "a little money". Creek makes some small passive volume controls with selector of a couple pieces of gear. Can probably find a used one here or on eBay starting at $100.
How much is "a little money". Creek makes some small passive volume controls with selector of a couple pieces of gear. Can probably find a used one here or on eBay starting at $100.