diff --git a/Outputs/CRT/Internals/CRTOpenGL.cpp b/Outputs/CRT/Internals/CRTOpenGL.cpp
index d9734646f..55c2a0053 100644
--- a/Outputs/CRT/Internals/CRTOpenGL.cpp
+++ b/Outputs/CRT/Internals/CRTOpenGL.cpp
@@ -429,12 +429,12 @@ void OpenGLOutputBuilder::set_timing_uniforms()
 	{
 		composite_separation_filter_program_->set_width_scalers(output_width, output_width);
 		composite_separation_filter_program_->set_separation_frequency(sample_cycles_per_line, colour_subcarrier_frequency);
-		composite_separation_filter_program_->set_phase_cycles_per_sample(0.25f, 6.0f);
+		composite_separation_filter_program_->set_extension(6.0f);
 	}
 	if(composite_chrominance_filter_shader_program_)
 	{
 		composite_chrominance_filter_shader_program_->set_width_scalers(output_width, output_width);
-		composite_chrominance_filter_shader_program_->set_phase_cycles_per_sample(0.25f, 5.0f);
+		composite_chrominance_filter_shader_program_->set_extension(5.0f);
 	}
 	if(rgb_filter_shader_program_)
 	{
@@ -449,7 +449,7 @@ void OpenGLOutputBuilder::set_timing_uniforms()
 	if(composite_input_shader_program_)
 	{
 		composite_input_shader_program_->set_width_scalers(1.0f, output_width);
-		composite_input_shader_program_->set_phase_cycles_per_sample(0.25f, 0.0f);
+		composite_input_shader_program_->set_extension(0.0f);
 	}
 	if(rgb_input_shader_program_)
 	{
diff --git a/Outputs/CRT/Internals/Shaders/IntermediateShader.cpp b/Outputs/CRT/Internals/Shaders/IntermediateShader.cpp
index ebda43d6d..cbc7dbbb1 100644
--- a/Outputs/CRT/Internals/Shaders/IntermediateShader.cpp
+++ b/Outputs/CRT/Internals/Shaders/IntermediateShader.cpp
@@ -40,7 +40,6 @@ std::unique_ptr<IntermediateShader> IntermediateShader::make_shader(const char *
 		"in vec2 ends;"
 		"in vec3 phaseTimeAndAmplitude;"
 
-		"uniform float phaseCyclesPerTick;"
 		"uniform ivec2 outputTextureSize;"
 		"uniform float extension;"
 		"uniform %s texID;"
@@ -94,7 +93,7 @@ std::unique_ptr<IntermediateShader> IntermediateShader::make_shader(const char *
 
 			// setup phaseAndAmplitudeVarying.x as colour burst subcarrier phase, in radians;
 			// setup phaseAndAmplitudeVarying.x as colour burst amplitude
-			"phaseAndAmplitudeVarying.x = (phaseCyclesPerTick * (extendedOutputPosition.x - phaseTimeAndAmplitude.y) + (phaseTimeAndAmplitude.x / 256.0)) * 2.0 * 3.141592654;"
+			"phaseAndAmplitudeVarying.x = (((extendedOutputPosition.x - phaseTimeAndAmplitude.y) / 4.0) + (phaseTimeAndAmplitude.x / 256.0)) * 2.0 * 3.141592654;"
 			"phaseAndAmplitudeVarying.y = 0.33;" // TODO: reinstate connection with (phaseTimeAndAmplitude.y/256.0)
 
 			// determine output position by scaling the output position according to the texture size
@@ -461,9 +460,8 @@ void IntermediateShader::set_separation_frequency(float sampling_rate, float col
 	set_filter_coefficients(sampling_rate, colour_burst_frequency);
 }
 
-void IntermediateShader::set_phase_cycles_per_sample(float phase_cycles_per_sample, float extension)
+void IntermediateShader::set_extension(float extension)
 {
-	set_uniform("phaseCyclesPerTick", (GLfloat)phase_cycles_per_sample);
 	set_uniform("extension", extension);
 }
 
diff --git a/Outputs/CRT/Internals/Shaders/IntermediateShader.hpp b/Outputs/CRT/Internals/Shaders/IntermediateShader.hpp
index 08a3c6e89..13dedc2c4 100644
--- a/Outputs/CRT/Internals/Shaders/IntermediateShader.hpp
+++ b/Outputs/CRT/Internals/Shaders/IntermediateShader.hpp
@@ -76,7 +76,7 @@ public:
 		geometry should be extended so that a complete colour cycle is included at both the beginning and end,
 		to occur upon the next `bind`.
 	*/
-	void set_phase_cycles_per_sample(float phase_cycles_per_sample, float extension);
+	void set_extension(float extension);
 
 	/*!
 		Queues setting the matrices that convert between RGB and chrominance/luminance to occur on the next `bind`.