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- Early Color Television (http://www.videokarma.org/forumdisplay.php?f=36)

- - CTC-7 is coming MY way! (http://www.videokarma.org/showthread.php?t=255010)

holmesuser01

07-31-2012 05:49 PM

1 Attachment(s)

I placed an order for capacitors today. Several I couldn't find, but will worry about that later.

Also bought enough electrolytics to do this set, PLUS several audio amplifiers that I've been procrastinating with for years.

I've never seen a 6BK4 that looks like this one!

mstaton

07-31-2012 10:47 PM

You mean not burnt to a crisp? Most are very dark brown with a lot of use. More than likely replaced.

ctc17

07-31-2012 11:01 PM

Where is the getter in that 6bk4?
The glass darkens from the x rays. I have some that are black almost

mstaton

07-31-2012 11:05 PM

Quote:

Originally Posted by ctc17 (Post 3043473)

Where is the getter in that 6bk4?
The glass darkens from the x rays. I have some that are black almost

Me too but they still work great.

ctc17

07-31-2012 11:13 PM

Its fun to sniff around that area with a giger counter. Reducing the line voltage really lowers the xrays.
The HV system is designed with enough output to operate a fresh crt and full brightness. Well how may of these old sets have that...?
So all that extra headroom ends up as heat and x rays dumped off by the shunt tube.
Dropping the line voltage by 10 volts usually drops the shunt tube temp about 150 degrees F

zenithfan1

07-31-2012 11:21 PM

Don't look like a replacement, look at the base, 43rd week of 1957. I say it's a low hour set. CTC17, I've seen several with the getter very small and kinda hidden in the base, this looks like one of 'em.

mstaton

07-31-2012 11:26 PM

My eyes are getting old. LOL cant see the small print very well.

Electronic M

08-01-2012 01:09 AM

Quote:

Originally Posted by DaveWM (Post 3043281)

funny, I do that as well, only use color tv for color shows, BW tvs for BW programing. There is a LOT of good BW no matter how good my sets are setup, BW looks better on BW sets due to convergence.

My kids really don't like BW, they pretty much refuse to watch it. Maybe its a generational thing. I grew up with it so its normal to me, but they say its hard to recognize faces and keep the characters straight. Its like the color info is needed to process the image.

There was a good deal of monochrome programing in Chicago in the 90's when I was growing up and it always seemed normal to me....All it meant was that the program was an old show that was good enough to retain a following. I don't watch much old stuff anymore as I'm into Anime now, and usually too busy to watch anything else that I'd want to watch if I had the time.

holmesuser01

08-01-2012 03:53 PM

I agree that this is a low-hours set.

I wanted you guys to see that 6BK4, as I'd never in my life seen one made that way. I pulled the HV cover so you could see it and the flyback.

I've got 6BK4's, too, that are almost black that work as designed.

The one in this set is doing as it should. That cage full of holes allows me to see whats going on inside the cage fairly easily... The later versions had a solid metal cage... my CTC-10 included.

holmesuser01

08-01-2012 03:56 PM

Quote:

Originally Posted by ctc17 (Post 3043473)

Where is the getter in that 6bk4?
The glass darkens from the x rays. I have some that are black almost

I believe the getter is down low near the base of this tube. Thats where they are on the later ones.

zenithfan1

08-01-2012 07:14 PM

The CTC9 had a solid cage too, I like the ones with holes. I run my 9 and 11 with the door open so they can breathe, they run much cooler that way.

miniman82

08-01-2012 08:14 PM

That 6BK4 in your picture is an earlier version, a 'fat base' tube same as the one in my CT-100 and 21-CT-55. I had no idea they were made that long, I always assumed tubes with big bases were an early thing. The Sylvania Saratoga I picked up has a Rauland brand damper tube with a fat base, and it's an early one. Never seen one from '57.

47'Plymouth

08-07-2012 12:34 PM

that is reason they nickname it the "the cat-killer"because your puty tat
winds dead from all of the x-rays it admits.from sleeping under it!:yes::yes:

holmesuser01

08-07-2012 02:45 PM

Quote:

Originally Posted by 47'Plymouth (Post 3044202)

that is reason they nickname it the "the cat-killer"because your puty tat
winds dead from all of the x-rays it admits.from sleeping under it!:yes::yes:

I'll wait and see if my cats glow. They do like the warmth of a tube set.

MY CAPACITOR ORDER CAME YESTERDAY!! Got shorted a few, but they are now on their way!!

holmesuser01

10-19-2013 11:49 AM

I am resurrecting this old thread. I am FINALLY able to continue with this set, and will be working on it during the winter this year.

I had to let the set sit all wrapped up on a covered porch until this week. I just pulled the chassis again to help make the set a bit easier to move.

I didn't do anything to this set this summer because of all the rain, and the numbers of monster mosquitos that we had this year.

Steve D.

10-19-2013 12:46 PM

Glad to see you're continuing w/the RCA CTC-7 thread. To compliment Nick's posting of the "Wentworth" catalog page, I'm attaching a photo from another RCA Victor catalog.

Have fun w/your winter project,
-Steve D.

holmesuser01

10-20-2013 09:29 PM

It's in the house, and the chassis is sitting in the cabinet.

I've got a large bag full of most of the capacitors that this set uses ready to install.

wa2ise

10-21-2013 02:02 PM

Quote:

Originally Posted by 47'Plymouth (Post 3044202)

the "the cat-killer"because your puty tat
winds dead from all of the x-rays it admits.from sleeping under it!

I remember something about this, instead of cats it was young kids watching cartoons while they slide their legs under the set, and sit up close to the TV CRT screen. Putting their future family life at risk...

stromberg6

10-21-2013 03:20 PM

I once measured my CTC-4 at .4 millirems/hour with the Geiger tube right up to the safety glass, and with a white raster. :D

Findm-Keepm

10-23-2013 11:17 AM

Me, I'd replace the 6BK4 with a 6BK4C. Much more reliable, and secondly, less X-radiation. Reliability is the big thing. Too much current through the 6BK4 heats up the fly quite quick. Also, I'd change the AGC coupling cap off the flyback - those were known to short and eat flybacks. I've not seen a CTC-7 flyback offered anywhere for years, so protect it in any way you can!

Cheers,

holmesuser01

10-23-2013 01:56 PM

Quote:

Originally Posted by Findm-Keepm (Post 3085476)

Thanks for the hint. I've got plenty of 6BK4C's here.

Ordered the capacitors a few months back before I got the set into the house. I'm fairly sure the AGC coupling cap was in the list. There were only a couple of capacitors that I couldn't find. We'll see how it goes.

DaveWM

10-23-2013 02:28 PM

some motivation for you, my CTC-7

Caps
http://www.youtube.com/watch?v=d05VbgDtI_c

Convergence
http://www.youtube.com/watch?v=2wYn3xLrZj0

Done
http://www.youtube.com/watch?v=lJUeUH8bTW4

Have fun with it, I really like my CTC-7

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