August 1977 RCA Colortrak

[pac.attack76]

Originally Posted by damen

Start with the 3 white shafts that protrude through the board at 12 o'clock, 4 o'clock, and 8 o'clock.

Will do.

[pac.attack76]

Those 3 white one moved convergence around. Looks like that's ok but geometry is a mess.

[vol.2]

Originally Posted by pac.attack76

Those 3 white one moved convergence around. Looks like that's ok but geometry is a mess.

Geometry looks okay to me for a set like that. You have problems with horizontal convergence on the red, and the image is shifted to the left a little bit.

The tube is probably also a little bit beat. If you turn down the contrast knob, and the lines come together better, then it's more likely that the tube is just old and needs to be over-driven to achieve reasonable brightness. What happens is that the emissive material gets used up on the surface of the electron guns, and/or the phosphors on the inside of the tube start to fade, and then it doesn't get as bright anymore. You can turn up the contrast to make it brighter, but the system is only designed to operate at a certain voltage level. You could think of it in a way somewhat similar to how a home audio amplifier is only designed to amplify sound by the amount of watts it's rated at, except it's video amplifiers in this case. If you push an audio amplifier outside of it's operating range, the sound distorts. The same thing will happen if you push the contrast too high on a TV. Keep in mind that when the TV was new, it would have been much brighter when set at a lower contrast level, and so would not be as distorted.

[pac.attack76]

I guess I've done bout all i can do. I think its pretty good for a 77 and its came a long way since I got it 2 weeks ago.

[vol.2]

Originally Posted by pac.attack76

I guess I've done bout all i can do. I think its pretty good for a 77 and its came a long way since I got it 2 weeks ago.

It looks pretty darn good for what it is.

I can't tell if it's just the exposure on your photo, but it looks a little too red/pink to my eyes. That can be tweaked with the tint knob on the front panel. Should be able to make the grey a little more grey, and Artemio's face should be more of a light tan skin tone.

[old_tv_nut]

The tint knob won't affect the grays. They could be adjusted by a slight tweak of the red G2.

[vol.2]

Originally Posted by old_tv_nut

The tint knob won't affect the grays. They could be adjusted by a slight tweak of the red G2.

I was thinking that after I left the comment. The tint will help the skin tones, but I guess the greys don't (or shouldn't) be affected by shifting the chroma. Whoops.