I have Roku . I have subscriptions to Netflix and Amazon. I am not a big fan of old movies but I see plenty are available. I don't know enough about the Roku Ultra to help you with your decision. Both Netflix and Amazon require a payment, so not free. There is a Roku Channel which offers free "Hollywood hits" which it describes as comedies, award-winners, cult classics and more. Maybe you could watch the movies you like there, for free.

Aren't your 4k TVs smart TVs? If so, you should be able to stream from them after paying for subscriptions to streaming services (e.g., for Amazon Prime, Netflix, etc). You don't need to buy a ROKU or Fire Stick to stream from a smart TV, tablet or computer. Depending on the level of your subscriptions, you can use more than one (smart) TV at a time to stream. You don't need a separate subscription for each TV (or computer or tablet or phone).

I have the basic Roku.. have had it for (probably close to 10?) years and it works fine. That said, when I replace my tv one of these days, I'll update my streaming device also. I prefer Roku to apple tv and amazon fire because it will also stream Acorn.tv and Spotify.

Yes, you will need to have a streaming device on each tv. I don't know that you need the super processing power of the ultra for old classic movies which aren't in high definition. I would think you'd be fine with a premier even the model below that. I am not an expert on these things though. I just know that my original Roku is running fine.

I am surprised that you found a 4k tv that isn't a smart tv with either Roku or some other proprietary streaming software installed.

We use a Google Chromecast that works to stream/cast movies, YouTube, etc. Most videos have a Chromecast icon or else you can cast the page, but that doesn't lead to the best quality. We can also stream Amazon and Netflix from our Blue Ray DVD player. Most should have apps that allow this.

We have a second TV in the back, and we have the older Chomecast on that one. When we select to cast, we have to choose which device to cast to. So, yes, you do need one for each TV.

You could also probably run an HDMI cable from your computer to the TV, which is what we did before the Chromecast, but the casting is way more convenient. We can cast from the computers, iPad, or phones.

We use Apple tv and it's very easy to switch the device to another tv. I also have Firestick. I stream tv from Amazon and Netflix

Pretty sure that if your TV is a Smart TV you don't need another device to stream.

The problem is finding the correct station(?) to find the old movies. Turner Movie Classics might be what you are looking for? Hulu is a subscription service, they advertise that they have 'classic movies', I don't have Hulu so I don't know.

Watch TCM app will also let you stream entire movies - if your provider is affiliated...

I used to stream old movies on Netflix but they have cut way way back on their offerings. Thankfully I have now seen many of the best ones.

Carol, I have OTA tv; no providers. I would prefer to not stream from my smart tv as I am not particularly comfortable with it. Sorry to post and run but I will check back in tomorrow if I can - am mostly out of the area over the next 2 days. Thanks everyone!

We have a Roku on each tv. We use Amazon, Netflix and Acorn but a lot of the old black and white movies I watch are on You Tube. I came across a long list of old British movies I'd never heard of starring B list actors the other night.