diff --git a/src/main/java/gregtech/api/util/GTUtility.java b/src/main/java/gregtech/api/util/GTUtility.java
index 9b3c1082408..628e61ef3e9 100644
--- a/src/main/java/gregtech/api/util/GTUtility.java
+++ b/src/main/java/gregtech/api/util/GTUtility.java
@@ -448,6 +448,11 @@ public static byte getOppositeSide(ForgeDirection side) {
             .ordinal();
     }
 
+    /**
+     * Gets the voltage tier corresponding to an amount of EU, capped to 15 (MAX+)
+     * @param l The amount of EU
+     * @return Corresponding voltage tier in the range 0-15
+     */
     public static byte getTier(long l) {
         if (l > V[14]) return 15;
         if (l <= V[0]) return 0;
@@ -460,6 +465,17 @@ public static byte getTier(long l) {
         return (byte) ((log2L - 2) / 2);
     }
 
+    /**
+     * Gets the voltage tier corresponding to an amount of EU, capped to 127
+     * @param l The amount of EU
+     * @return Corresponding voltage tier
+     */
+    public static byte getTierExtended(long l) {
+        if (l <= V[0]) return 0;
+        int log2L = 64 - Long.numberOfLeadingZeros(l - 1);
+        return (byte) Math.min(((log2L - 2) / 2), 127);
+    }
+
     public static long getAmperageForTier(long voltage, byte tier) {
         return ceilDiv(voltage, GTValues.V[tier]);
     }
diff --git a/src/main/java/gregtech/api/util/MultiblockTooltipBuilder.java b/src/main/java/gregtech/api/util/MultiblockTooltipBuilder.java
index 30abba0fdd5..5d468a7c0f2 100644
--- a/src/main/java/gregtech/api/util/MultiblockTooltipBuilder.java
+++ b/src/main/java/gregtech/api/util/MultiblockTooltipBuilder.java
@@ -567,7 +567,7 @@ public MultiblockTooltipBuilder addOtherStructurePart(String name, String info,
      * @return Instance this method was called on.
      */
     public MultiblockTooltipBuilder addTecTechHatchInfo() {
-        iLines.add(EnumChatFormatting.BLUE + TT_tectechhatch);
+        iLines.add(EnumChatFormatting.GREEN + TT_tectechhatch);
         return this;
     }
 
diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/MTEIndustrialElectromagneticSeparator.java b/src/main/java/gregtech/common/tileentities/machines/multi/MTEIndustrialElectromagneticSeparator.java
index 38ae848b060..0a95059efde 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/MTEIndustrialElectromagneticSeparator.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/MTEIndustrialElectromagneticSeparator.java
@@ -97,7 +97,9 @@ public static String buildMagnetTooltip(MagnetTiers m) {
             if (m.supportsExotic) tooltip = tooltip + "/n "
                 + EnumChatFormatting.BOLD
                 + EnumChatFormatting.GREEN
-                + "Can Use Multiamp Hatches";
+                + "Can Use Multiamp Hatches/n "
+                + EnumChatFormatting.RED
+                + "Limit to one energy hatch if using Multiamp";
 
             return tooltip;
         }
diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/compressor/MTEBlackHoleCompressor.java b/src/main/java/gregtech/common/tileentities/machines/multi/compressor/MTEBlackHoleCompressor.java
index b1f45e5b552..81abe90dbc9 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/compressor/MTEBlackHoleCompressor.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/compressor/MTEBlackHoleCompressor.java
@@ -376,6 +376,9 @@ protected MultiblockTooltipBuilder createTooltip() {
             .addInfo(
                 EnumChatFormatting.RED
                     + "Recipe tier is limited to hatch tier + 1. Will not perform overclocks above the hatch tier.")
+            .addInfo(
+                EnumChatFormatting.RED
+                    + "Limit to one energy hatch if using a Multiamp or Laser hatch.")
             .beginStructureBlock(35, 33, 35, false)
             .addCasingInfoMin("Background Radiation Absorbent Casing", 950, false)
             .addCasingInfoExactly("Extreme Density Space-Bending Casing", 3667, false)
@@ -416,6 +419,11 @@ public boolean checkMachine(IGregTechTileEntity aBaseMetaTileEntity, ItemStack a
         spacetimeHatches.clear();
 
         if (!checkPiece(STRUCTURE_PIECE_MAIN, 17, 27, 10)) return false;
+        // Allow only 1 energy hatch if laser/multiamp
+        if (!mExoticEnergyHatches.isEmpty()) {
+            if (!mEnergyHatches.isEmpty()) return false;
+            if (mExoticEnergyHatches.size() > 1) return false;
+        }
         return mCasingAmount >= 950;
     }
 
@@ -685,7 +693,7 @@ public void onPostTick(IGregTechTileEntity aBaseMetaTileEntity, long aTick) {
     }
 
     public int getMaxParallelRecipes() {
-        int parallels = (8 * GTUtility.getTier(this.getMaxInputVoltage()));
+        int parallels = (8 * GTUtility.getTierExtended(this.getMaxInputEu()));
         if (blackHoleStatus == 4) parallels *= 4;
         else if (blackHoleStability < 60) {
             parallels *= 2;