Rca ctc-5

[miniman82]

Risk your flybacks at your own peril, I can only tell you that for me they have always run much cooler when the AC input voltage was set where the schematic shows- 117 AC. If you don't like the variac because it gets hot, buy an RCA isotap transformer. It has a switch instead, so you can set it and forget it.

Main reason high input voltage is bad is because it causes horizontal output cathode current to rise objectionably high, test and see for yourself. The more voltage goes into the set, the higher it will go. That's why flybacks run hotter why you plug it directly into the wall. More current=more heat, and if you're like me you don't like replacing flybacks from a preventable situation.

[DaveWM]

well its too hot at 117 or what ever is at the wall so I am going with the fan, with that it will prob not get over 90f (with it right on top of the fly).

I think I will tap the DC off the HOT cathode fuse, just use a couple alligator clips one to the chassis one to the top of the fuse (just need to be sure I don't tap the B+ fuse )

[DaveWM]

made up a cardboard top, cut the hole for the fan right over the fly. The cathode supply voltage at the fuse was not enough to run the fan, so I am back to a 9v battery for now. I only cut an opening on the top for the fan, there are cooling holes on the side but I will prob open up a hole for the air to escape, but for now I am running some temp test.

I will next make up the fan supple from the 6.3v supply, seem like where the tuner connection would be a good place to tap into it.

[stromberg6]

I've been following this thread with great interest, as I have a CTC-5N in the works, but have yet to continue (the chassis is re-capped, and has been powered up using load resistors without any trouble), and the info here will be invaluable. I'm particularly interested in what is being used to remotely measure the fly temperature, and where to obtain such a device. My CTC-4 fly seems to run hotter than I would like at 117 volts, and maybe I should use a small fan for that one.
Thanks for all the info!
Kevin