diff --git a/TODO.txt b/TODO.txt
index 45a4a36..96fc164 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -41,7 +41,6 @@ materials.ores	No		Tin
 materials.ores	No		Zinc
 -------------------------------------------------------------------------------------------------------
 tech.base		No		Alloy furnace
-							-> comparator output
 							-> search recipe
 							-> crafting recipe
 							-> I18n
diff --git a/src/java/mmm/tech/base/TBAlloyFurnaceBlock.java b/src/java/mmm/tech/base/TBAlloyFurnaceBlock.java
index 6171b8d..742f923 100644
--- a/src/java/mmm/tech/base/TBAlloyFurnaceBlock.java
+++ b/src/java/mmm/tech/base/TBAlloyFurnaceBlock.java
@@ -22,6 +22,7 @@ import net.minecraft.entity.Entity;
 import net.minecraft.entity.EntityLivingBase;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.init.SoundEvents;
+import net.minecraft.inventory.Container;
 import net.minecraft.inventory.InventoryHelper;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
@@ -330,7 +331,6 @@ public class TBAlloyFurnaceBlock
 	{
 		if ( !TBAlloyFurnaceBlock.keepInventory ) {
 			final TileEntity tileEntity = worldIn.getTileEntity( pos );
-
 			if ( tileEntity instanceof TBAlloyFurnaceTileEntity ) {
 				final TBAlloyFurnaceTileEntity afte = (TBAlloyFurnaceTileEntity) tileEntity;
 				afte.cancelAlloying( );
@@ -338,9 +338,30 @@ public class TBAlloyFurnaceBlock
 				InventoryHelper.dropInventoryItems( worldIn , pos , afte.fuel );
 				InventoryHelper.dropInventoryItems( worldIn , pos , afte.output );
 			}
+			worldIn.updateComparatorOutputLevel(pos, this);
 		}
 
 		super.breakBlock( worldIn , pos , state );
 	}
 
+
+	// *************************************************************************************************
+	// COMPARATORS
+	// *************************************************************************************************
+
+	public boolean hasComparatorInputOverride( IBlockState state )
+	{
+		return true;
+	}
+
+
+	public int getComparatorInputOverride( IBlockState blockState , World worldIn , BlockPos pos )
+	{
+		TileEntity te = worldIn.getTileEntity( pos );
+		if ( ! ( te instanceof TBAlloyFurnaceTileEntity ) ) {
+			return 0;
+		}
+		return Container.calcRedstoneFromInventory( ( (TBAlloyFurnaceTileEntity) te ).output );
+	}
+
 }