Good budget AV amp?

[CageyH]

My Sony STR DA1200ES still works fine, but the HDMI is only used for vidéo.
I have been having problems getting the Dolby 5.1 to work with Netflix, even though I have a "certified/Licenced" Android TV box.
So thoughts are currently to replace it, on a budget.
It will be running KEF Coda speakers and an XTZ sub. Is it worth adding Atmos speakers?

Add is 7.1 a worthy addition?

It is only used for watching movies, and big sports events, so I see no point in spending silly money on a replacement amp.
Any recommendations for an older unit I can pick up 2nd hand?

[Pigmy Pony]

I had one of these for years, it performed well, and to my ears better than Sony's current budget model (which I now use). It cost about £350 when new, and decent examples can be had for about 50 quid.

https://www.ebay.co.uk/itm/136918708710?_skw=sony+str-dh800&itmmeta=01KEA545VZK1QYP1MMJH2PVTEE&hash=item1fe0fdb1e6:g:q18AAeSwCDlpWnkd&itmprp=enc%3AAQAKAAAA8FkggFvd1GGDu0w3yXCmi1cj%2FdC PrnegyXpwXqUF9Dr0rZlqfOwCATE94NpEIVq1YFAml6jBiG0xA %2Fz8QvFROBPEG8nMnkBCafuWDwbpgEss14xWr4CeYUnz2Yx31 KFmrnbV2K4L3bqfF3t6ELweBYu1edZkcPlb38L7VI7cZRX1Q6u Xls7BYo11a7PwWMJKDJ9al7Xf%2FnRXlgFviFGnfBFL74RTzeW tvZtvSS6%2FecQhUu3bonIPUBZyVSvHqdlB2R9jAJeWy2WcAwk E6uSEsj9vJVuTAbkDci18xYF5qTZL3hAtEyEJ0H3v%2FNvhhRP 0YQ%3D%3D%7Ctkp%3ABk9SR6jekMXyZg

[CageyH]

Thanks for the info.
I have picked up another android TV box, which allows me to select the audio output, so 5.1 is working.
This gives me more time to find a decent amp, and possibly go atmos.