Deader than dead CTC-9

[Tom9589]

Timmy, when you adjust the HV down to 25K, you will actually be putting more load on the flyback. Remember, the total load on the flyback is the sum of the current drawn by the CRT and the current drawn my the HV voltage regulator. As the scene on the CRT gets brighter, the CRT draws more current while the voltage regulator draws less and vice versa. The whole idea of shunt regulators is to present a constant current load to the flyback/HV rectifier under all screen brightness levels.

[timmy]

Originally Posted by Tom9589

Timmy, when you adjust the HV down to 25K, you will actually be putting more load on the flyback. Remember, the total load on the flyback is the sum of the current drawn by the CRT and the current drawn my the HV voltage regulator. As the scene on the CRT gets brighter, the CRT draws more current while the voltage regulator draws less and vice versa. The whole idea of shunt regulators is to present a constant current load to the flyback/HV rectifier under all screen brightness levels.

As electronic m noted in a previous post that leaving the hv to high does run the risk of arcing within the crt and damaging both the flyback and the crt.

[Sparky]

Enjoy the free chest and x-rays.
Better get that HV under control.
This leads me to the following report.

ALL of the resistors in the HV regulator circuit were waaaay off. Changed them all out with some 1% resistors as seen in the picture.

The focus resistors were even worse. 22M was like 43M. All were replaced with series-parallel 1%'ers to make up the high resistance and wattage values.
Caps in the HVR and the defective burned one were replaced as well.

After futzing around with why the width was shrunken. The 6DQ5 was replaced a few days ago by the owner. He reports full width and 710V of boost.

I placed an additional type AGC fuse & fuseholder in the existing holes in the top of the chassis. Changed out both the type N fuse & fuseholder for AGC. Now both the primary and secondary is fused.

This weekends adventure is fixing the vertical linearity. Everything has been replaced EXCEPT for the components in the yoke.

So I'm go'in all in.
Enjoy some pix.

[Electronic M]

Originally Posted by Sparky

Enjoy the free chest and x-rays.

Don't X-ray your banana too much otherwise ya won't be able to have kids.

[Sparky]

I couldn't find any coconut smilies....

[zeno]

Originally Posted by Electronic M

Don't X-ray your banana too much otherwise ya won't be able to have kids.

After 20 yrs with TV's in my lap I still wasnt shooting blanks. Just another
government scare tactic...............

73 Zeno
LFOD !

[Tellyrescue]

Progress update:
Now have a pic on the screen still yet to change electrolytics and do full setup-convergence. The HV and cathode currents have been tamed and the set doesn't smoke or get hot even after 30min on.

[Tellyrescue]

Here's some progress pictures.
Next on the list is power supply caps