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> 明日都合が **よければ** きてください.
>
> 東京へ **きたら** 、ぜひ連絡してください.

Why in the second example we can't replace たら with ば but in the first one we
use ば.

Aren't きてください and 連絡してください both requests or is there a difference?
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grammar conditionals
Difference between ば and たら in this example
My impression is that ば presents a vague or hypothetical situation/state, and
ら applies to actions and is similar to "when."

> 明日都合がよければきてください.  
>  If tomorrow happens to be convenient, please come.
>
> 東京へきたら、ぜひ連絡してください.  
>  When you come to Tokyo, please contact me without fail.

With those implications, the opposite doesn't make much sense.

"When tomorrow is convenient, please call." The conditional is too strong and
confident for the unknown situation.

"If perhaps you come to Tokyo, please contact me without fail." The
conditional is too weak, and it is modifying an action.
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I agree with Darcinon in general, but I'd add that the difference between ～ば
and ～たら is not _situation/state vs. actions_ , but rather _hypothetical vs.
probable_. I will try to describe it in short.

> **X～たら、Y** construct always implies, that X has occurred before Y, and
>
>   1. either Y can/could occur only after X
>   2. or Y is a result of x
>

>
> It may help to know for better understanding, that **～たら** form is derived
> form archaic form for complete action.

**Examples of the case 1**

先生に聞いたら、すぐ分かりました。 = If you listen to a teacher, you will understand this
immediately.

花子さんは朝ご飯を終わったら、家を出てしまいました。 = When Hanako had finished her breakfast she left
home.

**Examples of the case ２**

大学を出たら、小学校の先生になります。 = When I graduate, I will become an elementary school
teacher.

危ないよ。 落ちたら、けがをするよ。 = Watch out! If you fall, you'll hurt yourself!

> On the other hand, **～ば** form just expresses a condition, that can be in
> this case hypotetical and even unreal

**Examples**

兄が行かなければ、私も行きませんよ。 = If my brother does not go, I will not go as well.

私が男であれば、サッカー選手になりたい。 = (a woman speaking) If I were a man, I'd want to be a
football player.

> So you can note, that ～たら and ～ば are not always interchangeable

金持ちになったら、親に家を買ってあげます。 = _When I become_ a rich man I will buy my parents a
house. (sounds like a real plan)

金持ちになれば、親に家を買ってあげます。 = _If I became_ a rich man I would buy my parents a
house. (sounds like a nice dream)

時間があれば、東京へ行きたい。 = If I have spare time I'd like to go to Tokyo. (OK)

時間があったら、東京へ行きたい。= ??? This sounds weird, something like "When I have spare
time I will want to go to Tokyo (but without spare time I don't have such
desire)".
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