CTC-9 Winslow

[old_tv_nut]

1) Glad you found the video problem in the generator.
2) In the spirit of check the worst thing first, ditto on fixing the flyback temperature before anything else
3) Regarding video - some luma ringing and a lot chroma smearing - could be sound trap misaligned, either 4.5 MHz trap if it has one, or IF misalignment. Chroma bandpass could be off as well. Good luck hunting it down.

[old_tv_nut]

Is the width too narrow like it looks to be? If so, don't sweat the convergence until raster size is correct.

Also, when you get to the point of considering alignment, don't do it until you see how much improvement you can get just by fine tuning.

[Zsuttle]

Originally Posted by Electronic M

Flyback temperature shouldn't be that hot. Warm to the touch is what you want. Why are you running the HV that low? Most roundys usually specify 25KV. The lower you set the HV the more HV current, loading and heating the HV regulator causes in the flyback.

An additional thing you can do once you have all horizontal adjustments optimized and bad components identified and replaced is swap the HV rectifier and or focus rectifier tubes for solid state substitutes...The SS parts don't have heaters and reduce the flyback loading a few watts which can be helpful in cases like this.

I put in SS tubes for the focus rectifier and HV rectifier before I even fired the thing up. Too nervous about flyback issues. As for the HV, that was the "sweet spot" for the HOT current. It goes low at that point and then goes back up by a few mA. Schematic calls for HOT of 160mA on the SAMS. I'm pulling 30-40mA above that. I will say, after replacing that 66meg, my HV is a little low around 23kV at full adjustment. Adjustment calls for 23.5kV. I may repeat the whole adjustment process again for the HV.

Originally Posted by old_tv_nut

Is the width too narrow like it looks to be? If so, don't sweat the convergence until raster size is correct.

Also, when you get to the point of considering alignment, don't do it until you see how much improvement you can get just by fine tuning.

Width is just how the player decides to play that specific video. Not sure why, probably formatted like that. It was converged with a full-width image. I'll try to fix the flyback issue first. I'll start probing around.

[Zsuttle]

Finally decided to jump back on this set after awhile, another CTC-9 that I went through inspired me to finish this one.

I'm trying to do a video alignment after having to change the transformer between the 1st and 2nd video IF. Unfortunately, I'm not getting any of the expected readings off the SAMS.

Here's how I'm doing the alignment. HOT and Vertical output tube are removed, chassis is on bench. B+ has been set to 385V through a variac. Convergence assembly is disconnected.

Bias Supplies
Bias supplies are off of an RCA WG-307B and are set with a meter as follows:
-6V at point A (SAMS) or F on PW400B (RCA)
-15V at point B (SAMS) or G on PW400B (RCA)
-7V at point C (SAMS) or A on PW600 (RCA)
-7V at grid of horizontal blanking amp

Point E (SAMS) or D on PW400A (RCA) to chassis

Both -7V are sharing the same supply.

Signal Generator
Signal generator being used is an HP 8662A. Negative to chassis, positive to a floating tube shield placed halfway over the mixer/oscillator on the tuner. Telescoping shield on the M/O was slid down, hence why only halfway. Floating shield verified as not grounded.

Tuner is set to channel 4, Generator is set to 43.8 MHz, strength varied but no effect.

DMM connected through 10K resistor to point D (SAMS) or E on PW400-A (RCA)

I'm getting like 0.2V regardless of whether the generator is connected or not. Varying the coil doesn't change anything. Hopefully someone sees something out of place. I'm also wondering if I should work my way from the tuner forward using a scope to adjust each coil.