Keeping flybacks cool
 

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Andy: Thanks for the tip. I'll try it with my CTC-4, which also runs hot. Thats why they put a "chimney" on the HV cage! LOL.

Please measure the HOT currents first. What is the recommended current? Why is it hot?

With L117 you can adjust the horizontal output current.

Another hint: try it with a variac. 110V to 117V--with which mains voltage the flyback keeps cool?

A van is noisy and it is a deviation from original status.

- Eckhard

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Very good idea.

Heat is the enemy of electronics.

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Excellent Idea! My first vintage color set was an RCA CTC-12P with remote (SAME exact set as on the sams photofact 640-3 cover) with a roasted flyback. I found a new flyback at a TV repair shop in Inglewood for $25 (hey, it was 1990!) and wired it in, it still ran hot. The fan would have come in very handy then....

Could it be possible for a modern fly to be modified to fit a vintage color set?
By the way, most computer stores sell fans made completely out of billet aluminum, which would look great attached to a metal HV cage.

http://jonsey.blogdns.org/img/fan.jpg

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If you can wire a fan with a 12v power supply (radio shack) to the on/off switch on the tv, the fan will come on when the set is powered and turn off when the set is off. I tried this on my magnavox. Works excellent!

I don't think a solid state set's flyback would work on a tube set as the flyback provides an impedance match to the yoke coils on a tube set whereas the solid state set I believe runs the yoke right off of the horiz. output transistor. On a solid state set the flyback is mostly there just for the HV output and to provide other power supply outputs. Also the way it is set up for the horizontal output tube connection would be totally different than the transistor.

You might be able to retrofit a flyback used in a tube set that had a solid state tripler (such as a Zenith 4-tube set) back for use in an older tube set but I think that's as far as you could go.

Sometimes you can substitute deflection yokes between different brands of tube type sets. I used an Admiral yoke from a console on a RCA CTC-53 portable where the original yoke had burned. (I kept the original convergence coils from the RCA, which were fine.) The setup seemed to work quite well.

I don't remember the chassis number; but, an old Magnavox repairman told me that one of the last hybrid 19" chassis used a conventional tube flyback and HV rectifier tube. He said that it gave trouble early in the game and that Magnavox provided a kit that contained a different flyback, a solid state tripler, and some other parts. He said the conversion was a pain; but, when you did 50 of them, it got easier.

Maybe this is too dumb to mention, but connecting two identical fans in series will give you less noise and more air, if you mount them right. You don't need a leaf blower to move air through an old TV or radio cabinet.

Phil Nelson