Quote:
Originally Posted by walterbeers
I was also thinking of putting a small computer fan on the top of the HV cage in my 1954 CTC2B, 21CT55 21 inch color. I don't see where it would cause any harm. Yes, I have always thought that around 210 ma was about the max that the cathode current should be at. The HV cage on that old set is completely enclosed except for a hole in the top with a "chimney cap", in which I could install a fan. Possibly the reason that HV cages as so tightly enclosed it to reduce x-radiation.
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I did add a small fan to the HV cage on my CT55 and it made a huge difference in keeping the fan cool to the touch. I was also concerned about the noise, but I found a small low noise 2.25" fan at Mouser. Look for a fan with low noise and low air volume. I made a round hole in the side of the HV cage and connected it to the switched side of the incomming AC. You can hear it a bit at start up when the sound is not on but when the audio is at normal room volume it can not be heard at all.
The original flyback got wiped out shortly after the set was restored, and I did not want to chance that the UBER RARE replacement would get fried. So I added the fan and the flyback runs cool to the touch now.