diff --git a/simpegEM/FDEM/FDEM.py b/simpegEM/FDEM/FDEM.py
index acceece7..0cb050ee 100644
--- a/simpegEM/FDEM/FDEM.py
+++ b/simpegEM/FDEM/FDEM.py
@@ -126,6 +126,7 @@ class BaseFDEMProblem(BaseEMProblem):
         return S_m, S_e
 
     def getSourceDeriv(self,freq,adjoint=False):
+        raise NotImplementedError('getSourceDeriv not implemented yet')
         return None, None
 
 
@@ -197,6 +198,10 @@ class ProblemFDEM_e(BaseFDEMProblem):
 
         return RHS
 
+    def getRHSDeriv(self, freq, u, v, adjoint=False):
+        raise NotImplementedError('getRHSDeriv not implemented yet')
+        return None
+
 
 class ProblemFDEM_b(BaseFDEMProblem):
     """
@@ -266,6 +271,10 @@ class ProblemFDEM_b(BaseFDEMProblem):
 
         return RHS
 
+    def getRHSDeriv(self, freq, u, v, adjoint=False):
+        raise NotImplementedError('getRHSDeriv not implemented yet')
+        return None
+
 
 
 ##########################################################################################
@@ -374,9 +383,12 @@ class ProblemFDEM_j(BaseFDEMProblem):
 
         return RHS
 
+    def getRHSDeriv(self, freq, u, v, adjoint=False):
+        raise NotImplementedError('getRHSDeriv not implemented yet')
+        return None
+
 
 
-# Solving for h! - using primary- secondary approach
 class ProblemFDEM_h(BaseFDEMProblem):
     """
         Using the H-J formulation of Maxwell's equations
@@ -453,5 +465,7 @@ class ProblemFDEM_h(BaseFDEMProblem):
 
         return RHS
 
-
+    def getRHSDeriv(self, freq, u, v, adjoint=False):
+        raise NotImplementedError('getRHSDeriv not implemented yet')
+        return None
 
diff --git a/simpegEM/FDEM/SurveyFDEM.py b/simpegEM/FDEM/SurveyFDEM.py
index f08d6dc0..ebc7b015 100644
--- a/simpegEM/FDEM/SurveyFDEM.py
+++ b/simpegEM/FDEM/SurveyFDEM.py
@@ -94,7 +94,6 @@ class RxFDEM(Survey.BaseRx):
 class SrcFDEM(Survey.BaseSrc):
     freq = None
     rxPair = RxFDEM
-    knownSrcTypes = ['RawVec', 'MagDipole'] #TODO: remove known source types from base simepeg 
 
 
 class SrcFDEM_RawVec_e(SrcFDEM):
diff --git a/simpegEM/TDEM/SurveyTDEM.py b/simpegEM/TDEM/SurveyTDEM.py
index 668b43a0..37fc8d94 100644
--- a/simpegEM/TDEM/SurveyTDEM.py
+++ b/simpegEM/TDEM/SurveyTDEM.py
@@ -68,7 +68,6 @@ class RxTDEM(Survey.BaseTimeRx):
 class SrcTDEM(Survey.BaseSrc):
     rxPair = RxTDEM
     radius = None
-    knownSrcTypes = ['VMD_MVP', 'CircularLoop_MVP']
 
     def getInitialFields(self, mesh):
         F0 = getattr(self, '_getInitialFields_' + self.srcType)(mesh)