Rca or zenith

[iong]

Hi Zenith6S321,
Thanks for the information. How did you install flyback cooling fan in the sealed up 29jc20 cage?
Perry

[Zenith6S321]

Originally Posted by iong

Hi Zenith6S321,
Thanks for the information. How did you install flyback cooling fan in the sealed up 29jc20 cage?
Perry

Look at post #82 of this thread:
http://videokarma.org/showthread.php...=29jc20&page=6

I cut a piece of plastic to replace the moveable HV cover and mounted a fan in it to pull hot air out. I cut a slot at the back for cool air to enter and added a fin to direct the air down to the flyback. It seems to work well.

Dave

[Olorin67]

I remember hearing that when Setchell carlson started making color sets, RCA sent a bunch of engineers to Minnesota to figure out how SC was getting much better pictures on their sets, even though they were using the same RCA tube.

[zeno]

Originally Posted by Jon A.

I'd like to know how to do that. I never know when it might be needed.

I also need to look up the selenium stinkpot replacement info and write it down.

Electronic M covered seleniums well so.

If you cant find NOS eff coil IIRC they were wound on the same
form as convergence coils but its been 30 yrs !!. You can rewind
on an old form & change the slug. Using a sub requires mounting
change, not my strong point..... You can also add or remove
windings to get the wrong value in range.

73 Zeno

[Jon A.]

Originally Posted by zeno

Electronic M covered seleniums well so.

If you cant find NOS eff coil IIRC they were wound on the same
form as convergence coils but its been 30 yrs !!. You can rewind
on an old form & change the slug. Using a sub requires mounting
change, not my strong point..... You can also add or remove
windings to get the wrong value in range.

73 Zeno

Thanks. That's where redneck engineering comes in for me. Working on a minor fit problem now. I should be able to get the Tatachi running like new.

[DavGoodlin]

Originally Posted by Olorin67

I remember hearing that when Setchell carlson started making color sets, RCA sent a bunch of engineers to Minnesota to figure out how SC was getting much better pictures on their sets, even though they were using the same RCA tube.

Perhaps it was Setchell-Carlson's unitized construction and mindful placement/isolation of signal wiring rather than convenience and compromises of using printed circuit boards.
IMAO, RCA figured that any adjustment could compensate for the undesired coupling capacitances.

[Tubejunke]

Someone with a 3D printer and a LOT of patience could probably make a few bucks winding coils for both Zenith and RCA people. I just doubt that the average person is going to go through all of that to make a set work. It would probably save a lot of sets from either sitting in someone's stumped/non repairable pile useless to the world or else dumpster heaven....

I know I would buy a couple after my dreadful hunt of the country for mine....

[Jon A.]

Originally Posted by Tubejunke

Someone with a 3D printer and a LOT of patience could probably make a few bucks winding coils for both Zenith and RCA people. I just doubt that the average person is going to go through all of that to make a set work.

I'm not the average person, ha. I'd rather wind them on convergence coil forms though.