RCA CTC-16XL Suggestions/Tips

[Rocket]

Originally Posted by Yamamaya42

could be,,,
once they start to get carbon on them, it's hard to stop it.

I lost the cap to my horz output, and had to rig something, not as critical at the reg, they do have caps you can buy, but I'm not sure what size to get.

Well shoot.. I was hoping I could clean or fix my current one.
That cable gave me a good shock when I got close to it near the top of the HV cage. So I run my probe and it looks to pickup some discharge along that cable back to the HV cage.

[Electronic M]

If there is an obvious carbon track and it won't clean off you can drill out or grind the carbon track off and rebuild with silicone caulk...The HV rect bottom socket cups in some sets will arc through and carbonize and that is my typical solution to that...The silicone caulk has a higher dielectric strength than the average plastic they used back then so it at least in the case of carbonized holes is usually a sound solution...YMMV.

[Yamamaya42]

Originally Posted by Rocket

Well shoot.. I was hoping I could clean or fix my current one.
That cable gave me a good shock when I got close to it near the top of the HV cage. So I run my probe and it looks to pickup some discharge along that cable back to the HV cage.

being zapped by the CRT hv high voltage is graduation from greenhorn to veteran TV repair person. i cant count how many times i have had the joy of being hit by the reaming charge left in the CRT, it's one of the most exciting things about TV repair, is that you will Never know when you will be knocked on your ass by a hv discharge. anyway. if your cap on your reg has been arcing, then it has been most likely has carbon on it, and is hard to remove, but not impossible.

[Rocket]

Originally Posted by Electronic M

Some focus ideas: there should be a ~3-6KV ceramic cap on the focus coil that may not be holding correct capacitance value. IIRC the 16 is tube focus rectification...I tend to switch most focus rects to modern SS HV diodes. Removing the filament load relieves the flyback, and tube focus rects are not always as stable as I like.

If you can get the HV cage open to look for arcing/corona that may help.

I found it, its a 130m 6kv. I believe that is a 13pf. Closest I Found is a 12pf 6kv over at mousers

While I am over at mousers I can pickup them SS rectifiers. it is these ones correct? https://www.mouser.com/ProductDetail...7ob59eZhXAY%3D

I also checked the resistor that is on the other side of that cap, its pretty far out of range. its suppose to be 47.5 meg and reads at 58 meg. I happen to have a 2 watt replacement I could use, however this thing looks pretty huge, a lot bigger than my 2 watt. Sams doesn't say the wattage to use for this.

Originally Posted by Electronic M

If there is an obvious carbon track and it won't clean off you can drill out or grind the carbon track off and rebuild with silicone caulk...The HV rect bottom socket cups in some sets will arc through and carbonize and that is my typical solution to that...The silicone caulk has a higher dielectric strength than the average plastic they used back then so it at least in the case of carbonized holes is usually a sound solution...YMMV.

Well it sure can't hurt to give that a try, is there a particular silicone caulk that I should use? Same stuff to use on the flyback? I am thinking of doing the flyback as well.

Originally Posted by Yamamaya42

being zapped by the CRT hv high voltage is graduation from greenhorn to veteran TV repair person. i cant count how many times i have had the joy of being hit by the reaming charge left in the CRT, it's one of the most exciting things about TV repair, is that you will Never know when you will be knocked on your ass by a hv discharge. anyway. if your cap on your reg has been arcing, then it has been most likely has carbon on it, and is hard to remove, but not impossible.

Whoot! I'm upgrading from greenhorn : D Ive been trying really hard not to get knocked on my ass. I only wish I could be half as good as y'all ; )
I am getting better though and may get there someday

The cap is pretty filthy with a black sooty substance, some of it has cleaned off but not at all of it. But I don't see a track or haven't found it yet

[Electronic M]

Originally Posted by Rocket

I found it, its a 130m 6kv. I believe that is a 13pf. Closest I Found is a 12pf 6kv over at mousers

While I am over at mousers I can pickup them SS rectifiers. it is these ones correct? https://www.mouser.com/ProductDetail...7ob59eZhXAY%3D


Well it sure can't hurt to give that a try, is there a particular silicone caulk that I should use? Same stuff to use on the flyback? I am thinking of doing the flyback as well.


The cap is pretty filthy with a black sooty substance, some of it has cleaned off but not at all of it. But I don't see a track or haven't found it yet

May want to check the cap against it's listed value on the schematic before you order to be sure.

Those are the diodes. I'd order 2 and wire them in series for the focus rect...That way if anything arcs to the focus line it won't take out the diode as easily.

IIRC last time I did a fly doughnut the customer wanted me to use Permatex gray from the auto parts store...I recommend any 'sensor safe' silicone caulk (other types may contain acid that can corrode wires overtime).

Rubbing alcohol, glass cleaner and Goof off (a flamable liquid cleaner)are my go-to for HV cage cleaning. Goof off can dissolve plastics and some paints so I tend to reserve it for metal and as a nuclear option for some issues.

[Yamamaya42]

"Whoot! I'm upgrading from greenhorn : D Ive been trying really hard not to get knocked on my ass. I only wish I could be half as good as y'all ; )
I am getting better though and may get there someday "


Well, I got started very VERY young, being born with an innate ability to take things apart, and put them back together again... and have them STILL WORK!
Always had an strong aptitude for electronics, had my first soldering iron at age 10, was playing with old amps ( tube and SS ) in my teens, watched my dad fixing TVs growing up, surpassed his abilities at 15ish.
In my sophomore and Jr years of HS, I took the Electronics course they had ( which I terrorized :p )
It was there that they had all sorts of fun donated old electron goodies, and where I learned a lot of the stuff I still use today, ( and got zapped quite a few times ) AND... found out the hard way, that a picture tube really CAN implode when you least expect it.
It was from this class that I found and kept ( saved ) my CTC-16XL, along with other rare items like, a Zenith transoceanic royal 1000 , A Sansui 9090 & 1000, 2 dynakit mark iii amps. uher 22 hi fi special.
NOOO, I'm not a electronic pack-rat..

[Bill R]

Before you try moving the convergence yoke, don't overlook the selenium rectifier block on the convergence board. As they age they start to break down. Usually just replace it with individual silicone diodes.

[Rocket]

Originally Posted by Electronic M

May want to check the cap against it's listed value on the schematic before you order to be sure.

Those are the diodes. I'd order 2 and wire them in series for the focus rect...That way if anything arcs to the focus line it won't take out the diode as easily.

IIRC last time I did a fly doughnut the customer wanted me to use Permatex gray from the auto parts store...I recommend any 'sensor safe' silicone caulk (other types may contain acid that can corrode wires overtime).

Rubbing alcohol, glass cleaner and Goof off (a flamable liquid cleaner)are my go-to for HV cage cleaning. Goof off can dissolve plastics and some paints so I tend to reserve it for metal and as a nuclear option for some issues.

Good call there Tom! I have not yet placed the order. I checked the schematic and its lists that cap at 130pf not 13.

https://flic.kr/p/RSgie4

Oh good, I wanted to make sure that was the silicon : D

Sadly I already found out that goo off can dissolve plastic a little while back : /

[Rocket]

Originally Posted by Yamamaya42

"Whoot! I'm upgrading from greenhorn : D Ive been trying really hard not to get knocked on my ass. I only wish I could be half as good as y'all ; )
I am getting better though and may get there someday "


Well, I got started very VERY young, being born with an innate ability to take things apart, and put them back together again... and have them STILL WORK!
Always had an strong aptitude for electronics, had my first soldering iron at age 10, was playing with old amps ( tube and SS ) in my teens, watched my dad fixing TVs growing up, surpassed his abilities at 15ish.
In my sophomore and Jr years of HS, I took the Electronics course they had ( which I terrorized :p )
It was there that they had all sorts of fun donated old electron goodies, and where I learned a lot of the stuff I still use today, ( and got zapped quite a few times ) AND... found out the hard way, that a picture tube really CAN implode when you least expect it.
It was from this class that I found and kept ( saved ) my CTC-16XL, along with other rare items like, a Zenith transoceanic royal 1000 , A Sansui 9090 & 1000, 2 dynakit mark iii amps. uher 22 hi fi special.
NOOO, I'm not a electronic pack-rat..

Oh wow! that's amazing! what's crazy is I sorta had a similar start in my young years. I got my first soldering gun at 12 though and I would often fix things like vcr's of my parents friends and such.

Then I sadly took a different path, my 10th grade art teacher thrown me up to a locker and said I was a worthless pos and I should drop out of school. Sadly I took his advice and I've always regretted that, ive felt like I have always had more potential. I have never had any kind of schooling or the such, just kinda learned things as I go.
I also got into computers very early, so I spent a good deal of my life working on computers and the such. And then every now and then poke at my vintage tv/radio stuff.

Back In my late teen years I ran across an old RCA tv from 1949 that was in a barn. I paid 10 bucks for it and took it home. That got me started in tube electronics. I got very lucky, I didn't know any better but the first thing I did was plug that tv in and turn it on. It didn't blow up, thankfully, but I actually got sound, but no picture. I replaced all the paper/wax caps. didn't do any resistors. and it worked, worked really really good. it always surprises everyone the great picture that tv has. I have hauled that TV around for 15+ years now. although its not a daily driver, it does get turned on a used. and all these years its never stopped working, much to my surprise. that is until not all that long ago. I was watching it and the crisp picture faded away to a blank raster : / I pulled the chassis to check out what I done all them years ago as I can't really remember and was a little afraid to see a crappy job or something, lol. but I am kinda proud of my younger self, I did a pretty darn good job. I pulled most all caps I replaced and did little splicing. I did find a 2 papers I didn't replace, probably didn't have them or something, I don't know why I didn't lol. But that didn't fixed the problem. so I pulled out the tube tester to test all them 29 tubes and would ya know one of the tubes went out. replaced the tube and boom, back to running good again. lol I should have checked the tubes before pulling the chassis. but I was really curious to see under it, its been so many years. lol

I also have 2 zenith radio tube sets from the 40's, a table top and a console. 7s633 and 8s563 man I love them radios : D and a sears silvertone a friend gifted to me. I am not quite the packrat, but I do have a fascination for these old tube electronics. I also have another RCA TV 21-D-7479 set a friend gifted me, but the chassis is rusted way beyond saving, I think, just crumbles when you touch it. though I have been thinking of seeing if I can bring life into again anyways, can't hurt to try right ; ) the picture tube tests ok-ish and there is a deal of wax under the flyback, maybe why it got put out of service. but I actually have a spare new in the box fly for that thing. Oh, I also picked up a Philco 12'' set 50t-1403. hmmm maybe I do have a problem. lol

This color tv though, its worlds more involved!

Oh man, now I'm rambling on lol

[Rocket]

Originally Posted by Bill R

Before you try moving the convergence yoke, don't overlook the selenium rectifier block on the convergence board. As they age they start to break down. Usually just replace it with individual silicone diodes.

Hey Bill! Thanks, I didn't even think of that. I think ive read something somewhere a while back that its good idea to replace selenium rectifiers. I will look into doing that as well and see what happens.

[Electronic M]

Originally Posted by Rocket

Oh wow! that's amazing! what's crazy is I sorta had a similar start in my young years. I got my first soldering gun at 12 though and I would often fix things like vcr's of my parents friends and such.

Then I sadly took a different path, my 10th grade art teacher thrown me up to a locker and said I was a worthless pos and I should drop out of school. Sadly I took his advice and I've always regretted that, ive felt like I have always had more potential. I have never had any kind of schooling or the such, just kinda learned things as I go.
I also got into computers very early, so I spent a good deal of my life working on computers and the such. And then every now and then poke at my vintage tv/radio stuff.

Back In my late teen years I ran across an old RCA tv from 1949 that was in a barn. I paid 10 bucks for it and took it home. That got me started in tube electronics. I got very lucky, I didn't know any better but the first thing I did was plug that tv in and turn it on. It didn't blow up, thankfully, but I actually got sound, but no picture. I replaced all the paper/wax caps. didn't do any resistors. and it worked, worked really really good. it always surprises everyone the great picture that tv has. I have hauled that TV around for 15+ years now. although its not a daily driver, it does get turned on a used. and all these years its never stopped working, much to my surprise. that is until not all that long ago. I was watching it and the crisp picture faded away to a blank raster : / I pulled the chassis to check out what I done all them years ago as I can't really remember and was a little afraid to see a crappy job or something, lol. but I am kinda proud of my younger self, I did a pretty darn good job. I pulled most all caps I replaced and did little splicing. I did find a 2 papers I didn't replace, probably didn't have them or something, I don't know why I didn't lol. But that didn't fixed the problem. so I pulled out the tube tester to test all them 29 tubes and would ya know one of the tubes went out. replaced the tube and boom, back to running good again. lol I should have checked the tubes before pulling the chassis. but I was really curious to see under it, its been so many years. lol

I also have 2 zenith radio tube sets from the 40's, a table top and a console. 7s633 and 8s563 man I love them radios : D and a sears silvertone a friend gifted to me. I am not quite the packrat, but I do have a fascination for these old tube electronics. I also have another RCA TV 21-D-7479 set a friend gifted me, but the chassis is rusted way beyond saving, I think, just crumbles when you touch it. though I have been thinking of seeing if I can bring life into again anyways, can't hurt to try right ; ) the picture tube tests ok-ish and there is a deal of wax under the flyback, maybe why it got put out of service. but I actually have a spare new in the box fly for that thing. Oh, I also picked up a Philco 12'' set 50t-1403. hmmm maybe I do have a problem. lol

This color tv though, its worlds more involved!

Oh man, now I'm rambling on lol

That teacher was probably projecting his problems onto you...The title art teacher should disqualify him from making any statements about any academic matters, and give you an indication of how far he has fallen from any life aspirations he had in his younger years. Its too bad your parents weren't like mine, they'd have told you the same then went to school and read that schlub the riot act bad enough that he'd be scared of ya.

[Rocket]

Originally Posted by Electronic M

That teacher was probably projecting his problems onto you...The title art teacher should disqualify him from making any statements about any academic matters, and give you an indication of how far he has fallen from any life aspirations he had in his younger years. Its too bad your parents weren't like mine, they'd have told you the same then went to school and read that schlub the riot act bad enough that he'd be scared of ya.

hehe yeah too bad they didn't, that would have been great! him afraid of me instead of me of him Too bad I didn't see things differently back then as I do now. But I'm thankful, ive come pretty far on my own : )

[Rocket]

Progress update,

New 6kv cap arrived so I thought about getting that knocked out. Got it pulled out and it was 3 times out of range on just my multimeter. While having that out, I also pulled that 4.7 meg that was at 6 meg that was connected to it to replace it as well. connected up with this 6kv cap is a 6kv 66 meg crazy looking resistor. It reads completely open O.o I was not sure if there was a special way to test such a resistor, but I would figure a resistor is a resistor right? I should get 66 meg give or take. So if that is bad where about do I even get a resistor of that size? I could not find one on mousers.

Next, I don't how I missed this when I looked over everything under the chassis and cleaned up the controls, but the Service/Normal switch is burnt to a crisp O.o and is even missing part of its wafer and 3 of the 4 connection points broke away from the switch. Not sure what would cause that switch to burn up like that.. Anyone have an idea where I could pick up a replacement switch?

[Yamamaya42]

Why do i have the sudden urge to say " I am Groot" :p

[Rocket]

Originally Posted by Yamamaya42

Why do i have the sudden urge to say " I am Groot" :p

That's awesome! : D