OP states;
"Amos 3:6b as :
If there is a calamity in a city Yahweh not will have done (it)
This implies, to me, that Jehovah causes 'calamities"
We have to remember that It was God who planted the tree of good and evil, not the tree of good and calamity.
The people who Amos is talking to need to know that it is their true God that is bringing this evil upon them. He is warning and prophesying what will happen to them so they know that it is from His hand and why this will happen to them. After all He is sovereign and will not let their corruption in their city's go on anymore. It is being judged by God.
"Amos' mission is directed to his neighbor to the north, Israel. His messages of impending doom and captivity for the nation because of her sins are largely unpopular and unheeded.. Quote by Nelson on Got questions.
This is what the LORD says: 'For three sins of Judah, even for four, I will not turn back [my wrath]. Because they have rejected the law of the LORD and have not kept his decrees, because they have been led astray by false gods, the gods their ancestors followed.'" Amos 2:4
Surely the Sovereign LORD does nothing without revealing His plan to His servants the prophets." Amos 3:7
Here is the reason for the adverse evil or calamity that's going to be brought on the surrounding nations as well as his own nation of Judah. It is God's judgment on them for their many sins of corruption
"Brief Summary: Amos can see that beneath Israel’s external prosperity and power, internally the nation is corrupt to the core. The sins for which Amos chastens the people are extensive: neglect of God’s Word, idolatry, pagan worship, greed, corrupted leadership, and oppression of the poor. Amos begins by pronouncing a judgment upon all the surrounding nations, then upon his own nation of Judah, and finally the harshest judgment is given to Israel. His visions from God reveal the same emphatic message: judgment is near." Quote by Nelson on Got questions .
In looking at the end of the book of Amos we see a restored nation which is showing that God's inflicting evil does not last but brings good.
The book ends with God’s promise to Amos of future restoration of the remnant.
I will bring my people Israel back from captivity, and they will rebuild the ruined cities, and inhabit them; and they will plant vineyards, and drink wine from them. They shall also make gardens, and eat the fruit of them.
I will plant them on their land, and they will no more be plucked up out of their land which I have given them," says the LORD your God. Amos 9:14-16
Side note on Evil Inflicted by God.
Attributing evil to God is hard for the natural mind of man to accept. God's ways are higher than man's ways and this is a great example of the difference between mans use of evil and God's.
We can see by many translations that they never want to equate God with inflicting evil, so other words are used instead of translating ra' consistently.
- ra' ►
רַע226 adjective bad, evil
Gods judgments are corrective and not vindictive like man's. His intent is always for the good when He uses evil for His purpose. Man's intent of evil is displayed in Joseph's brothers.
Genesis 45:1-15 Gives us a behind-the-scenes look of evil that was thrust upon Joseph by God.
We see the difference that man's heart meant it for evil but God meant it for good. Joseph experienced the evil that his brothers did to him when they sold him into Egypt:
As for you, you meant evil against me, but God meant it for good, Genesis 50:20
I form the light, and create darkness: I make peace, and create evil: I the LORD do all these things. Isaiah 45:7
The greatest evil in the entire universe was when God orchestrated the slaying of His own perfect Son.
And yet He meant it for good.
Only God's intention and use of evil can bring about good, because He alone is good and not evil. He never sins when using evil for His purpose.
OP's question;
"Therefore I question the translation which implies that God does 'evil
I believe this translation is. accurate because it was the Lord was sounding the trumpet of the evil that would come about before it happened. His prophet was bringing to light why this would happen.
Shall a trumpet the blown in the city, and the people not be afraid? Shall there be evil in the city, And the Lord has not done it? The companion Bible