CTC 5 in Ohio

[WISCOJIM]

Originally Posted by jeyurkon

Here is the 700 Series Setup

I don't plan on deleting it right away, but you never now. Please save a copy rather than relying on it being here.

John

Very nice scans! Thank you very much.


.

[jeyurkon]

I've started to test the tubes but only got about 1/3 of the way through. Until I get my reading glasses it's a bit tiring.

Besides the CRT having tested so strong, all of the tubes I've tested so far test like new, even the 6T8 of which I usually have trouble finding a strong one.

They also are all RCA with date codes in 1957. It seems like they're the original tubes. I don't think they watched this set much.

The 6BK4 seems to be the one without lead in the glass. Guess I'll make sure the cover is on the HV section when I ever get around to powering this set up.

Here's an interesting article on how to use the 6BK4 to generate x-rays.

John

[jeyurkon]

In the end I decided to follow jr_tech's advice.

I removed the 6CB6 HOT and gradually brought it up on a variac monitoring the power. It was drawing 380 watts at full voltage which is about 40 watts high. Just the variac draws 10 watts so it might be closer to 370 watts.

After reinstalling the 6CB6 and hooking up my laserdisc player I had a raster and good sound! The raster is high and to the left.

When I adjust the horizontal hold and get it close to locking in it goes into something that looks like barkhausen.

The power draw was down to 340 watts during this. I don't understand why, maybe having a signal helped. I thought having the HOT tube in would make it draw more.

Although it's difficult to tell in the photo, when I looked at the bright dots caused by the closed captioning, the convergence wasn't very bad. I thought it would be a lot worse with the raster positioned like it is. With no signal I get a very uniform white screen.

It looks like a simple recap and checking for bad resistors will make this an easy restore when I get around to it.

Oh, cats... All three of mine wanted to help. This made it quite a bit more difficult.

John

[jr_tech]

Great News !
It looks like nothing is seriously wrong with the set ! Now the big decision... repair the problems or do a total re-cap.

jr

Yes! I have also noticed that cats can be great little helpers.

[Phil Nelson]

Originally Posted by jr_tech

Now the big decision... repair the problems or do a total re-cap.

I'd replace the electrolytics before passing Go. You can still have fun troubleshooting, with less risk.

Phil