Hindi · Pronunciation Guide
jub — a dry unaspirated j, a bare schwa, and a b that keeps its voicing to the end.
jab
Short vowel in a closed syllable: heavy by position, negligible in time. As a subordinating conjunction it heads its clause without taking prominence, so it should almost run into the following word.
Listen: जब
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जब आप आएँ, तो फ़ोन कीजिए।
Jab aap aaeṁ, to fon keejiye.
When you arrive, please call.
Listen: जब आप आएँ, तो फ़ोन कीजिए।
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
"Jab aap aaeṁ, to fon keejiye" pairs jab with the correlative to, which is obligatory in Hindi where English "then" is optional. Aaeṁ is a subjunctive with a nasalized ending, agreeing with aap.
The vowel gets opened into "jahb" and the final b gets devoiced toward p — two automatic English habits. Keep the vowel neutral and the voicing continuous. The affricate also picks up a small puff in English, which nudges ज toward झ territory.