Life isn't always that simple.
But sometimes it's not as complex as we make it.
Most TV's don't "pass through" digital signals via their digital outputs. These generally only output what's generated by theit internal ATSC tuners.
I could be wrong. You might want to investigate this more.
But, ultimately, most sets offer an analog (red/white RCA jacks) which will (usually) pass what's fed into them.
My suggestion: Feed your Blu-Ray into your TV via HDMI, let the TV do the digital/analog conversion and let it be passed out those previously mentioned analog outputs. Then, any stereo amp, modern or vintage, connected to the TV could do the job.