Can I "lock" a channel to always have a tuner?

You already listed the only way to do it
"intermittent recordings through the day"

 

There is. I have two basic Roamio boxes. One only records CBS, NBC, MSNBC and Comedy Central. I know that tuner 0 will always be on NBC and tuner 1 will always be on NBC. Usually tuner 2 is on MSNBC and tuner 3 will be on Comedy Central. My other Roamio has one tuner always on ABC but has two Mini units, so the other three tuners can vary a lot since they also record other channels.

I know when I turn on my TV that I will see MSNBC if I have MSNBC displayed when I turn off the TV. One important factor: I'm single and live alone. I seldom record during the day. Right now HBO and Cinemax are not encrypted, so I'm making some recordings.

 

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You could set a manual recording to record the channel from midnight to 11:55PM every day and manually delete the previous days recording every day.

 

The alternative is get a Harmony remote and program it in to set the channel after it turns on the TV. There is also the Tivo android app + Tasker that could be set to intermittently send a change channel intent but I have never looked into doing that.

 

I also did a search and found that the telnet command still works with my bolt. At least I was able to connect to it.

 

I think they want the tuner to already be on that channel previously so they can start watching in the middle of a show and be able to rewind to the beginning of a show.