Should hero call this turn donk-jam?

Preflop check, flop check or small. Turn you have to call.

What's the reasoning behind calling on the turn?

Well what can be the reasoning of potting the flop is you not willing to get it in on a good turn card?

If turn is not an obvious getin for you, you should certainly check the flop intending to call dawn on many runouts.

I'm interested to hear what people think villain's range looks like after he check-calls flop and then pots the turn. My reasoning in hand was that this narrows his range to a few specific hand categories (showdown hands that picked up outs, like hands containing diamonds, as well as turned sets and two pairs etc). The point being that I am still beating many turned two pair hands. The question really is am I ahead enough to call, and also are there nutted hands like sets that villain may wait for a safe turn to get the money in with? So I'm interested to hear any reasoning beyond simply "you have a bunch of equity and therefore you cannot fold". I'm aware of that and I agree, I'm just interested to hear what people think villain's range looks like when he plays the hand this way.

Most people don't slowplay sets when spr is low.

Suppose villain jams flop with KJ+/sets+
Imagine if you were villain, what ranges will you call on flop?
Kxxx
QTxx
JQ9x
JT9x
J3xx

The 7 on turn is a literal blank. It doesn't really help villain out besides giving him a bdfd or more straight outs.

On the event villain has some random hand like KTQ7/QT77. We still have double gutshot and drawing to the boat going on for us.

We literally pot committed ourselves once we pot the flop, this is one of the best turn for us, it's kind of similar to pot flop, and villain jams on top.
I personally don't like committing ourself with only top+bottom on flop.

I don't hate the raise on the btn in a home game like this, but this is not a very good hand to raise with normally. Looks much better than it actually is. I'd also prefer a small sizing, like 1/3 pot on flop so you have more maneuverability on the turn and V can't just go all in.

As played, after you pot the flop, you have to call the turn when a blank like this comes out. He likely turned a flush draw with his straight draw and/or pair. You literally posted saying V likes to fire big semi-bluffs and then ask what to so when he fires a big semi-bluff! You are likely ahead and your dbl gutted as well on the rare chance you are not. The only thing to really worry about is 77 and if he does have that on this rare occasion, so be it.

A lot of draws that picked up diamonds, or even draws that don’t want to fold and want to see if you want to fold. He can have some worse made hands like J7 and a draw, and it’s unlikely he has a set. I’d be worried about K7 but we have a lot of outs against that.

Yeah this was pretty much my reasoning in the hand as played. Interesting observation about the flop bet sizing committing myself on the flop - what size do you think I should use instead?

Yes, this was what I thought during the hand too. I actually didn't realise I had a double gutter, I thought it was a single gutter. But even with the latter I think it's still enough equity to go with.

Yes that's true. Bottom line - I can't fold.

So I thought for a short while and called it off. Villain had A♠J♣4♦2♦, so I was approximately a 3 to 1 favourite:

He drilled an ace on the river to improve to a better two pair. But I got the money in ahead, and that's all one can do, right?

Wow a huge whale.
Try to keep him in game by all means.
Value town him to death.

Half pot or less.

But in game you got maximum value with such line.
Maybe pot is better when whale is in hand.

Also I'm just a huge nit that only nut peddles.

So taking whales to valuetown requires betting big. Reevaluate hand strength when faced with aggression. Reward is greater than risk when whale is in hand.

Okay, thanks for your thoughts, I appreciate it.