diff --git a/Outputs/CRT/CRT.cpp b/Outputs/CRT/CRT.cpp
index 7f0f4f20b..9a1cae3ae 100644
--- a/Outputs/CRT/CRT.cpp
+++ b/Outputs/CRT/CRT.cpp
@@ -375,7 +375,7 @@ void CRT::output_colour_burst(unsigned int number_of_cycles, uint8_t phase, uint
 }
 
 void CRT::output_default_colour_burst(unsigned int number_of_cycles) {
-	output_colour_burst(number_of_cycles, static_cast<uint8_t>((phase_numerator_ * 256) / phase_denominator_ + (is_alernate_line_ ? 128 : 0)));
+	output_colour_burst(number_of_cycles, static_cast<uint8_t>((phase_numerator_ * 256) / phase_denominator_));
 }
 
 void CRT::set_immediate_default_phase(float phase) {
diff --git a/Outputs/CRT/Internals/CRTOpenGL.cpp b/Outputs/CRT/Internals/CRTOpenGL.cpp
index 9b5b27abd..cfe48fc67 100644
--- a/Outputs/CRT/Internals/CRTOpenGL.cpp
+++ b/Outputs/CRT/Internals/CRTOpenGL.cpp
@@ -37,7 +37,7 @@ OpenGLOutputBuilder::OpenGLOutputBuilder(std::size_t bytes_per_pixel) :
 		texture_builder(bytes_per_pixel, source_data_texture_unit),
 		array_builder(SourceVertexBufferDataSize, OutputVertexBufferDataSize) {
 	glBlendFunc(GL_SRC_ALPHA, GL_CONSTANT_COLOR);
-	glBlendColor(0.3f, 0.3f, 0.3f, 1.0f);
+	glBlendColor(0.4f, 0.4f, 0.4f, 1.0f);
 
 	// create the output vertex array
 	glGenVertexArrays(1, &output_vertex_array_);
diff --git a/Outputs/CRT/Internals/Shaders/IntermediateShader.cpp b/Outputs/CRT/Internals/Shaders/IntermediateShader.cpp
index 630d09ce1..b191bdcf2 100644
--- a/Outputs/CRT/Internals/Shaders/IntermediateShader.cpp
+++ b/Outputs/CRT/Internals/Shaders/IntermediateShader.cpp
@@ -146,7 +146,7 @@ std::unique_ptr<IntermediateShader> IntermediateShader::make_composite_source_sh
 					"vec3 rgbColour = clamp(rgb_sample(texID, coordinate, iCoordinate), vec3(0.0), vec3(1.0));"
 					"vec3 lumaChromaColour = rgbToLumaChroma * rgbColour;"
 					"vec2 quadrature = vec2(cos(phase), sin(phase)) * vec2(abs(amplitude), amplitude);"
-					"return dot(lumaChromaColour, vec3(1.0 - amplitude, quadrature));"
+					"return dot(lumaChromaColour, vec3(1.0 - abs(amplitude), quadrature));"
 				"}";
 		}
 	}
diff --git a/Outputs/CRT/Internals/Shaders/OutputShader.cpp b/Outputs/CRT/Internals/Shaders/OutputShader.cpp
index 899d8f504..0ab9c2ff3 100644
--- a/Outputs/CRT/Internals/Shaders/OutputShader.cpp
+++ b/Outputs/CRT/Internals/Shaders/OutputShader.cpp
@@ -83,7 +83,7 @@ std::unique_ptr<OutputShader> OutputShader::make_shader(const char *fragment_met
 
 		"void main(void)"
 		"{"
-			"fragColour = vec4(pow(" << colour_expression << ", vec3(gamma)), 0.9);"//*cos(lateralVarying)
+			"fragColour = vec4(pow(" << colour_expression << ", vec3(gamma)), 0.8);"//*cos(lateralVarying)
 		"}";
 
 	return std::unique_ptr<OutputShader>(new OutputShader(vertex_shader.str(), fragment_shader.str(), {