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Ok, second roast, a nice colombian, didn't turn out so nice. Very flat and underdeveloped in the cup and noticed the usual nice aroma of the beans when transferring to a mason jar after roasting was missing. So, need help with best practice for ET in a turbo oven roaster that uses halogen lamp for heat source. ET sensor is 2" above bean mass, 2" out from stainless pot wall

Here's my ET/BT results from the roast after preheat at 150C for 3 min.

min 1 ET 137 BT 88
min 2 ET 149 BT 114
min 3 ET 174 BT 134
min 4 ET 198 BT 150
min 5 ET 218 BT 167
min 6 ET 232 BT 182
min 7 ET 245 BT 195
min 8 ET 246 BT 206
min 9 ET 246 BT 212
min 10 ET 246 BT 216
min 10:10 ET 246 BT 218 End of Roast. Level of roast = medium roast.