A few guys at the shmups forums were playing with this. Looks better than filters to me.
Note: Use the HLSL option mame has had for the last few versions, can add all manner of CRT effects to your LCD display, pincushion, scanlines, phosphor right down to convergence displacement.
Code Below
hlsl_enable 1
hlslpath hlsl
hlsl_prescale_size 2
hlsl_preset -1
hlsl_write
hlsl_snap_width 1920
hlsl_snap_height 1080
shadow_mask_alpha 0.15
shadow_mask_texture aperture.png
shadow_mask_x_count 512
shadow_mask_y_count 384
shadow_mask_usize 0.09375
shadow_mask_vsize 0.09375
curvature 0.05
screen_scale_top 1.0
screen_scale_bottom 1.0
pincushion 0.0
scanline_alpha 0.80
scanline_size 0.90
scanline_height 1.00
scanline_bright_scale 1.50
scanline_bright_offset 0.60
scanline_jitter 0.05
defocus_x 1.5
defocus_y 1.5
red_converge_x -0.4
red_converge_y -0.6
green_converge_x 0.0
green_converge_y 0.0
blue_converge_x 0.0
blue_converge_y 0.0
red_radial_converge_x 0.0
red_radial_converge_y 0.0
green_radial_converge_x 0.0
green_radial_converge_y 0.0
blue_radial_converge_x 0.0
blue_radial_converge_y 0.0
red_from_r 1
red_from_g 0.0
red_from_b 0.0
green_from_r 0.0
green_from_g 1
green_from_b 0.0
blue_from_r 0.0
blue_from_g 0.0
blue_from_b 1
saturation 1.20
red_offset 0.0
green_offset 0.0
blue_offset 0.0
red_scale 1.20
green_scale 1.20
blue_scale 1.20
red_power 1.70
green_power 1.70
blue_power 1.70
red_floor 0.06
green_floor 0.06
blue_floor 0.06
red_phosphor_life 0.10
green_phosphor_life 0.10
blue_phosphor_life 0.10
yiq_enable 0
yiq_cc 3.59754545
yiq_a 0.5
yiq_b 0.5
yiq_o 0.0
yiq_p 1.0
yiq_y 3.0
yiq_i 1.2
yiq_q 0.6
yiq_scan_time 52.6
yiq_phase_count 2